Rootstocks For Tropical and Subtropical Fruit Crops.pptx
- 2. “ ” Presented By SHIVAJI N. KOLEKAR Ph.D. (III Semester) Hort. (Fruit Science) Seminar Incharge Dr. S. R. PATIL Professor DEPARTMENT OF FRUIT SCIENCE POST GRADUATE INSTITUTE Dr. PANJABRAO DESHMUKH KRISHI VIDYAPEETH, AKOLA 2021-22
- 3. CONTENT Introduction History and Abilities of rootstocks Importance of rootstocks and types of rootstocks Characteristics of rootstocks Rootstocks of Citrus, Mango , Grape, Guava, Sapota and Avocado Challenges in rootstock usage Conclusion Future thrust
- 4. Introduction Rootstock is the lower portion of the graft which develops into the root system of the grafted plant. A rootstock may be a seedling, a rooted cutting or a layered plant. It is also described a plant which already has an established healthy root system on to which a cutting or bud from another plant is grafted. The plant part grafted on to the rootstock is usually called as scion. Rootstock are being used in plant propagation for more than 20 centuries. The rootstock may be a same or different species from the scion. The use of rootstock is most commonly associated with fruit crops. Rootstock
- 5. Rootstock
- 6. History of Rootstock Although grafting has been practiced for many hundreds of years, most orchard rootstocks in current use were developed in the 20th century. The budding or grafting of citrus became practice after appearance of Phytopthora foot rot appeared in the Azores in 1842.
- 7. Abilities of Rootstock A. Nursery ability: Ready availability of seed High percentage of polyembrony Good germination and seedling growth Free from pests attacks and easy budding B. Soil adaptability: Relative vigour of growth on soils of varied depth, structure, texture, pH, salinity, moisture and nutrient supply.
- 8. Abilities of Rootstock C. Climatic adaptability : Hardiness Resistant to cold D. Biotic adaptability: Free from or resistant to various soil borne diseases. Some rootstocks are found superior in one or more of these qualities but inferior in other but none is found outstandingly superior in all respects. Some rootstocks may be superior for one scion variety under given environmental conditions and inferior for other variety.
- 9. Importance of rootstock in fruit crops Impart resistance to biotic and abiotic stresses of scion cultivar Resistant to adverse soil and climatic conditions Cold hardiness Providing strong root system Regulate uptake of moisture and nutrients Regulate tree vigour and size Dwarfing effect Affect flowering, fruit set, fruit drop, fruit size Affect fruit quality and yield Trees propagated on rootstocks are true to type, comes to bear earlier, precocious.
- 10. Seedling Rootstock Clonal Rootstock Types of Rootstock
- 11. Seedling Rootstock These are developed from seeds. These rootstock are relatively simple and economical to produce. Root system developed by seedlings tend to be deeper. These are mostly used for tropical and sub-tropical fruit crops. Seedling rootstocks have an advantage that the plants don’t retain viruses occurring in their parent plants. Seedling rootstocks have a disadvantage of genetic variation which may lead to variation in performance of scion.
- 12. Clonal Rootstock Rootstocks propagated vegetatively are known as clonal rootstocks. These also include those propagated through a zygotic seeds (parthenogenetic, polyembryonic and apomictic seeds.) Each clonal individual plant is genetically same and have identical growth characteristics in a given environment (Hartman et al,2002). Major disadvantage of clonal rootstocks is that, they retain the viruses occurring in the parent plants. They will not produce deeper roots. Theses are available in majority for temperate fruits.
- 13. Characteristics of an Ideal Rootstock It should be compatible with scion cultivars and give maximum productive life to the trees. It should be well adapted to the agro-climatic conditions of the particular locality like frost, cold and heat. It should be resistant to diseases and pests prevalent in the concerned area. It should be tolerant to adverse soil conditions like salt, alkalinity, acidity and drought. It should have a positive effect on bearing and quality of scion variety. It should possess good germination capacity, a high degree of polyembryony, ability to attend graft-able size in a short period and free from excessive branching.
- 14. Stock-scion relationships A. Effect of stocks on scion cultivar 1) On size and growth : If a scion grafted on dwarf stocks, the scion will grow less vigorously, but if the same scion grafted on very vigorous stocks or rootstocks, the scion will grow very vigorously. Trifoliate orange is considered as dwarfing stocks for grape and sweet oranges. Some of mango rootstocks give dwarfness when grafted on scion cultivars like Kalapade, Olour etc. If guava cultivars grafted on Psidium pumilum it will be dwarf in size. Pusa Srijan guava stock, also give dwarfness in Allahabad Safeda, and it is a commercial cultivar of guava. 2. Precocity in flowering and fruiting: The time taken from planting to fruiting is called precocity and it is effected by rootstocks. Generally precocity is related to dwarfing stocks or rootstocks and slowness to fruiting with vigorous stocks. Mandarin citrus fruit, when grafted on Citrus jambhiri rootstock is taken less days for fruiting than those grafted on acid lime.
- 15. 3. Fruit set and yield When acid limes budded on rough lemon it will increased 70 % of yield compare to those budded on troyer citrange, Rangpur lime or its own stock. 4. Fruit quality When Sathugudi sweet oranges grafted on Gajanimma rootstocks it bears large but poor quality fruits while on its own stocks, they impart fruits with numerous quality and juice content. The physiological disturbance like 'granulation' in sweet orange is very low if grafted on Cleopatra mandarin seedlings, whereas, rough lemon seedling stocks stimulate high granulation. 5. Nutrient status of scion Rootstocks also affecting the nutrient behavior of scion. When Sathugudi orange trees budded on C. volkarimariana root stock it gives better nutrient status of all nutrients in the leaves than on its own rootstock or Cleopatra mandarin rootstocks.
- 16. 6. Disease resistance In citrus, an appropriate variation exists between the rootstocks in their return to diseases and nematodes. For example, rough lemon stock is tolerant to tristeza, xyloporosis and exocortis but is responsible to gummosis and nematodes. However, troyer citrange is tolerant to gummosis but responsible to exocortis virus disease. 7. Winter hardiness Grafting of Young grapefruit trees on Rangpur lime succeed on winter injury better than on rough lemon or sour orange. Sweet oranges and mandarins on trifoliate stocks were colder and hardy. 8. Capability to stand out the soil opposing status Foliate orange shows weak ability on citrus rootstocks, whereas, Rangpur limes, Sweet orange and Sour orange stocks shows medium capability to stand out against more salts in the soil condition.
- 17. B) Effect of scion on rootstock 1. Vigor of the stock Scion cultivar effect on size, nature and form of the stock. When grafted a vigorous scion on weak or dwarf stocks, than the growth of the stocks also induced, but if weak or dwarf scion grafted on vigorous stocks, the growth of the stocks will be decrease. A strong scion always cause the roots to become more resistant to wet, poorly aerated soils.
- 18. C) Influence on inter-stock To use certain dwarfing rootstocks as a vigorous for producing a non-vigorous and early bearing trees is in practice. For Amrapali, Anupam variety of mango is recommended as inter-stock, grafted on Mallika stock to stimulate dwarfness, precocity and development in fruit quality. On the other hand, sometimes inter-stock might not effect on desirable characters.
- 19. Rootstocks for Citrus Rootstock role in citrus is well known for its tolerance towards biotic and abiotic stress as well as for increasing yield and quality. A wide variety of rootstocks are available , each having desirable attributes.
- 20. Variability in Citrus Rootstocks Species Variability Rough lemon (C.jambhiri) Mithi, lambhiri Kotagiri, Renuka lemon, Florida Rough, Jatti Khatta, Jatti Khatti, Pathancot, lambhiri Nagpur, Khatta, Jallandar Khatti. Rangpur lime (C. limonia) Brazil orange, Brazilian Rangpur, Florida Rangpur-8748, Khasi lime, L-2 Rangpur lime, Marmalade orange, Pink Fleshed Lime. Small fruited Mandarin (C. resin) Kodakithuli, Citrus China, Cleopatra mandarin, Soh- seim, Karpura Tenga. Sour orange (C.aurantium) Karun jamir, Molepuli, Seville orange, Willow leaf sour orange,
- 21. Variability in Citrus rootstocks Species Variability Sweet orange (C. limettoides) Sweet orange Aabbu, Mithanembu, Sweet lime, Mitha. Trifoliate orange (Poncirus trifoliata) Christensen, English Dwarf, English Large, Flying Dragon, Trifoliate Argentina, Trifoliate Florida, Trifoliate William. Trifoliate hybrids Citrangequat, Citrange Morton, Citrumello, Swingle Citrumello, Savage, Troyer Citrange, Carrizo citrange, Rusk citrange. Kharna Khatta (C. Karna) Karna Khatta, Karna, Soh-sarkar, Karna Nimboo.
- 22. Rough lemon (C. jambhiri L.) Merits: High yield Vigourous suitable for deep soils Tolerant to Tristeza Drought tolerant Moderately tolerance to salinity Demerit Highly susceptible to phytophthora and nematode. Less cold hardy Uses Fully compatible with Oranges, grapefruits, tangelos and most mandarin varieties. One of its most favourable characteristics is that it grows well as a replant in old citrus soil.
- 23. Sour Orange (Citrus aurantium) Advantages: Tolerant to cold Tolerant to drought Resistance against the gummosis Tolerant to salinity and alkalinity Disadvantages: Intolerant to tristeza Susceptible to nematode. Uses: Grape fruit and orange yields on sour orange are moderate, with average fruit size and good quality.
- 24. Rangpur lime (C. limonia Osb.) Advantages: Drought tolerant Salinity tolerant Highly resistant to tristeza Disadvantages: Sensitive to cold Susceptible to phytopthora Uses: It makes a good union with number of citrus spp. like sweet orange ,mandarin and pummelo.
- 25. Troyer citrange (Sweet orange X trifoliate orange) Advantages: Cold tolerant Tolerant to tristeza Tolerant to phytophthora Disadvatages: Adversely affected by high pH Sensitive to soil salinity and water logging. Uses: It is used as major rootstock for madarins.
- 26. Cleopatra mandarin (C. reshni) Advantages: Tolerance to tristeza, exocortis, xyloporosis, salt, cold and calcareous soils. Cleopatra has been included in many rootstock trials, particularly in areas where sour orange was eventually replaced because of tristeza. Large tree, fruit size small, fruit quality high, slow growth in nursery. Disadvantages susceptible to foot rot, burrowing nematode and blight is very low. Uses Adapted to a wide variety of soils, used as rootstock for mandarin, Pineapple, Hamlin, Tangelos, oranges and grapefruit.
- 27. Alemow (C. macrophylla Wester) Alemow is a hybrid species possibly of citrus celebica and C. grandis native to the Philippines. cultivars budded on a lemon produce large, vigorous, grow well on both sandy and high pH, calcareous soils and high yielding trees. C. macrophylla have a deep, dense root system that imparts drought tolerance to the scion. It is an excellent rootstock for mandarin, lemons and limes. C. macrophylla is better adapted to cool dry climate and it is more tolerant to foot rot than true lemons. It is a classic example of a rootstock that possesses outstanding traits along with poor ones. They are the most tolerant to high of soil boron, chloride and calcium It is considered Phytopthora resistant.
- 28. Trifoliate orange (Poncirus trifoliata (L) The genus Poncirus consists of a single deciduous species, Poncirus trifoliate and has been a very significant source of rootstock cultivars. Smaller than standard trees High yield and high fruit quality Good cold hardness Foot rot resistance Tristeza and Phytophthora tolerant, resistant to nematodes, low salt tolerance, used for oranges, grapefruit It performs poorly in infertile sandy soil, where salinity is a problem. Trifoliate orange is resistant to rot, tristeza, and the citrus nematode.
- 29. Carrizo citrange Hybrid of Washington navel orange X Ponicirus trifoldiata. Advantages: Cold tolerant Tolerant to tristeza Tolerant to phytopthora and nematode Disadvantage: Adversly affected by high pH. Uses: Fully compatible with navel and Valencia orange varieties.
- 30. Rootstocks of Citrus Fruit crops Rootstocks Specific features Citrus Sour orange Extensively used for sweet orange, mandarins, grape fruit and lemon. Semi dwarf, Cold hardy, adaptable to heavy soils but susceptible to Tristeza. Trifoliate orange Dwarfing rootstock, cold hardy, resistant to soil borne pathogens, adapted to heavy soils, tolerant to nematodes and tristeza but susceptible to Tristeza. Rangpur lime Suitable for Sathgudi, Mosambi oranges, Nagpur and Kinnow mandarins. Vigorous, Hardy, adaptable to heavy soils ,Tolerant to drought, tristeza but susceptible to exocortis and burrowing nematode.
- 31. Rootstocks of Citrus Fruit crops Rootstocks Specific features Citrus Rough lemon It is widely used rootstock for sweet orange. It is tolerant to tristeza xyloporosis, exocortis and gummosis, suitable for deep sandy soils. Flying Dragon Potential Ultra dwarfing rootstock. Resistant to Tristeza virus. Tolerant to xyloporosis, exocortis and gummosis. Troyer Citrange Most promising rootstock for Nagpur mandarin and Kinnow mandarin in India. Suitable dwarfing rootstock for Kinnow in India. Karna Khatta Suitable semi- vigorous rootstock for Kinnow in India. Soh Sarkar Suitable vigorous rootstock for Kinnow in India.
- 32. Rootstocks of Citrus Fruit crops Rootstocks Specific features Citrus Rough lemon, Lemon and Cleopatra mandarin Suitable rootstock for sweet orange in India. C. Macrophylla C. Unshiu Citron, Kumquat Volkmer lemon (C. volkameriana) F & A Resistant to Tristeza virus. Freeze tolerant. Highly resistant to citrus canker. Suitable for navel orange, Valencia orange and grape fruit.
- 33. Characteristics of some selected citrus rootstocks Rootstocks Horticultural performance Yield Quality Plant vigour Rangpur lime G M G Marmalade orange G M G Rough lemon G L G Cleopatra mandarin M M M Sour orange G G M Sweet lime M M G Trifoliate orange L M L Troyer citrange M G M Carrizo citrange M G M Sweet orange G G M Karna Khatta G M M Nasnaran M G M G = Good, M = Moderate, L = Poor or low
- 34. Characteristics of some selected citrus rootstocks Rootstock Reaction to Yield Root rot Citrus nematode Tristeza Exocortis Salt Drought Root system Rangpur lime G MT S R S R R D Marmalade orange G MT MT R S R R D Rough lemon G S S R R T T D Cleopatra mandarin M T S R R MT S M Sour orange G R T HS T T MT D Sweet lime M S MT S S S S M Trifoliate orange L R R R H HS HS SH Troyer citrange M MT T MT S HS HS SH Carrizo citrange M MT T MT S HS HS SH Sweet orange G HS HS MT R S S M Karna Khatta G S MT - T T S D Nasnaran M S MT T R HT S M G = good, M = Moderate, L = Poor or low, R = Resistant, T = Tolerant, MT = Moderately tolerant, S =Susceptible, HS = Highly susceptible, D = Deep, M = Medium, SH = Shallow, - = No information
- 35. TabIe I: Rootstock-Scion Combinations Rootstock Kumquat Navel Orange Valencia Orange Grapefruit Mandarin1 Lisbon2 Lemon Eureka3 Lemon Meyer Lemon Lemon types Macrophylla — — C C — I3 I3 C Rough lemon — C C C C C I — Volkameriana4 — U C C U5 C C — Yuma ponderosa4 — U C — U C C C Mandarin types Cleopatra mandarin6 — C C C C I I — Rangpur4 — C C C U C C — Orange types Taiwanica — U C C U —7 —7 — Sour orange I8 C C C C C I — Sweet orange — C C C C C C — Trifoliate orange C9 C10 C C C11 C I — Trifoliate hybrids C-35 citrange — C C U C C — — C-32 citrange — C C U C C — — Carrizo citrange — C C C C11 C I — Troyer citrange — C C C C11 C I — Swingle — C C C U C I I (C = Compatible I = Incompatible U – Uncertain because observed less than 10 years — = No information) 1. Compatibility of mandarins varies with cultivar. 2. See Chart II. 3. Rootstock necrosis often develops. 4. Information presented is based on limited observations. 5. With Satsumas this combination develops a bud union overgrowth. 6. Especially good for cultivars with larger fruit sizes; Temple, Nova, Murcott, Orlando tangelo, and grapefruit. 7. Bud unions weak, often break. 8. Slow-growing, unhealthy-looking combination. 9. Good production with this combination. 10. With some scions, particularly Frost nucellar navel, trifoliates decline after 20 years due to bud union abnormalities. Rich 16-6, an experimental trifoliate, does not display this decline. 11. Sometimes a short-lived combination.
- 36. Table II: Lemon Compatibility Status Rootstock Eurekas, all Limoneira 8A Monroe Prior Strong Lemon types Macrophylla (Alamow) I (5-12) I (16-21) I (15) — I (15) Rough lemon I (11) C (20) — — — Volkameriana — C (20) — — — Yuma ponderosa C(20) C (20) C (20) C (20) C (20) Mandarin types Rangpur — C (20) — — — Orange types Taiwanica — — — — — Sour orange I (12-15) C (20) I (12-15)3 C (20) C (20) Sweet orange C (20) C (20) C (20) C (20) C (20) Trifoliate orange I (4) C (20) — — C (20) Trifoliate hybrids Troyer citrange I (2-8) C (20) C (20) C (20) — Swingle — C4 — — — (C = Compatible I = Incompatible U – Uncertain because observed less than 10 years — = No information) SOURCE: Schneider and Sakovich 1984, and additional information 1. ”C (20)” is used to indicate freedom from necrotic tissue at the bud union of trees more than 20 years old. 2. Following “I” the numbers indicate the age in years when delayed incompatibilities were first observed. 3. Trees affected were on Seville bitter orange in the 1940 strain plot at Riverside, CRC project 1134 (1951-1954). However, 25 year- old Ledig and Monroe Lisbons on Bradbury sour oranges at Limoneira appeared to be free of sour orange rootstock necrosis. 4. The oldest trees sampled were less than 20 years old.
- 37. Table III: Disease, Virus, and Nematode Susceptibility Rootstock Root rot Gummosis Armilliaria Citrus nematode2 Tristeza3 Exocortis Cachexia Woody Gall Lemon types Macrophylla tolerant4 tolerant susceptible susceptible susceptible tolerant susceptible tolerant Rough lemon susceptible5 susceptible susceptible susceptible tolerant - tolerant - Volkameriana susceptible susceptible —7 — tolerant tolerant — susceptible Yuma ponderosa tolerant susceptible — susceptible tolerant — — — Mandarin types Cleopatra mandarin susceptible susceptible — susceptible tolerant tolerant - tolerant Rangpur susceptible susceptible susceptible susceptible tolerant susceptible susceptible — Orange types Taiwanica susceptible tolerant - susceptible susceptible tolerant — — Sour orange intermediate tolerant susceptible susceptible susceptible tolerant tolerant tolerant Sweet orange susceptible susceptible — susceptible tolerant tolerant tolerant tolerant Trifoliate orange tolerant tolerant — tolerant tolerant susceptible tolerant — Trifoliate hybrids C-35 citrange tolerant tolerant — tolerant tolerant — — — C-32 citrange tolerant tolerant — susceptible tolerant — — — Carrizo citrange intermediate tolerant susceptible susceptible tolerant tolerant4 tolerant tolerant Troyer citrange intermediate tolerant susceptible susceptible tolerant tolerant4 tolerant tolerant Swingle tolerant tolerant — tolerant tolerant tolerant tolerant 1. Root rot and gummosis are caused by both Phytophthora citrophthora and P. parasitica. Root rot is caused by P. parasitica in summer and P. citrophthora in winter. Susceptibility to the two pathogens varies among rootstocks, but within a rootstock responses are similar. 2. (Tylenchulus semipenetrans) Biotypes 1,2,3 (McCarty et al. 1979). 3. Widespread and naturally transmitted in southern California, consequently not controlled by budwood there. 4. Produces some dwarfing, but no cracking or scaling. 5. Variation among cultivars. 6. Contridictory evidence. 7. No information available.
- 38. Rootstocks of Mango In India seed propagation is the chief method of multiplication of rootstock. Monoembryonic and polyembroyonic both types of rootstocks are uses in propagation of mango. Dwarfism and tolerance to salinity are two most desired characteristics for a mango rootstocks. Use of non-descriptive mango stones for multiplication of rootstocks has led to enormous variation in the performance of mango clones in the orchards. Attempts have been made to standardize the rootstocks for various scion varieties.
- 39. Rootstocks of Mango Polyembryonic Goa Olour Bellary Bappakai Kurukan Mylepalium Chandrakaran Monoembryonic Langara Dashehari Bombay green Totapuri red small
- 41. Bombay green Totapuri Red small
- 42. Effect of different mango rootstocks on scion cultivars Dwarfing effect:- In India rootstocks with dwarfing effect include Kalapady, Olour, Kerela dwarf,Manjeera, Crepping, Amrapali, Vellaikulamban. Rootstock Vellaikulaban impart dwarfing effect to dashehari and Alphonso where as Olour the same effect to Langra and Himsagar cultivars (Kulkarni,1991). Ability to absorb nutrients:- Rootstock 13-1 of mango has the capacity to resist the absorption and translocation of Na and Cl and facilitate the absorption of calcium and is known to reduce the incidence of internal fruit breakdown. Amrapali grafted on Kurukkan rootstock has more Cl leaf content than any other rootstock (Dayal et al, 2014).
- 43. Effect of different mango rootstocks on scion cultivars Tolerance to salt:- Mango rootstocks found in India are only moderately tolerant to salt. Polyembryonic rootstocks namely Bappakai, Olour and Kurukkan could withstand higher level of salinity. Mango cultivar 13-1 has been selected as a polyembryonic rootstock for calcareous soils or for irrigation with saline water.
- 44. Effect of different mango rootstocks on scion cultivars Fruit quality and yield: Influence of rootstock on the fruit quality and yield is reported in many trials done in India. Neelum cultivar get higher total soluble content and yield when grafted on polyembryonic rootstock Bappakai than on other polyembryonic and several other monoembryonic rootstocks. Mylepalium and vellaikulamban rootstocks increased the TSS of the Dashehari cultivar than other rootstocks. Langra grafted on Bappakai rootstock record highest fruits number/plant followed by Vellaikulamban
- 45. Rootstocks of Mango To minimize the variability in mango, the poly-embryonic races, known for their uniformity and vigorous growth offer a great scope for use as rootstocks. Sr. No. Rootstocks Special features 1 Kurrukan Salt resistant polyembryonic 2 Olour Vigorous rootstock 3 Vellaikolamban Dwarfing and allopolyploid 4 Olour, Villai collumban and Rumani Dwarfing 5 Moovandan and Nekkare Salt tolerant 6 Gomera l Most adaptable in saline conditions where low water quality 7 Species Mangifera minor Resistant to anthracnose 8 Mangifera zeylanica Salinity resistance 9 Bappakai and Olour Salt tolerant for high survival, germination and growth percentage under salt stress condition (Varu and Barad, 2010) 10 Dashehari and Chousa Salt resistant
- 46. Rootstocks of Grape Level of Tolerance Rootstocks Highly Tolerant 110 Richter, 140 Ruggeri Tolerant 1103 Panlsen, SO4 and 99 Richter Less Tolerant 3309 Couderc,42O A Millardet and de grasset, 5 BB Kober, Rupestris due lot (St. George), 101 Millardet and de grasset Susceptible Riparia Glorie Relative Tolerance of Grape Rootstocks for Drought
- 47. Rootstocks of Grape Situation /problem Rootstock Water shortage 1103P, 140RU,110R,420A,SO4,99R Soil EC >2mmhos/cm and water EC>1mmhos/cm Ramsay, Dogridge B, 140RU, 99R,110R Soil ESP> 15% and or water SAR >8% 140RU,1613, Ramsay, Dogridge Free Ca content of soil is >12% Fercal, 140RU, 420A,SO4 Chloride content of water is >4 meq/lit Ramsay, Dogridge B,140RU,teleki-5-C Poor vigor of the variety without any soil/water problem Ramsay, Dogridge B,140 RU For increased Nitrogen and Phosphorus uptake Dogridge B, St. George, 34 EM, Ramsay For Increased bud break 1613 Recommended Grape Rootstocks for Different situation
- 48. Rootstocks of Grape Sr. No. Rootstocks Special Features 1 Riparia Gloire, St. George (Rupestris du lot), S04 (Selection Oppenheim), 5BB (Kober), 5C (Teleki), 420A (Millardet et de Grasset), 99R (Richter). Phylloxera resistance 2 Salt and nematode resistant Salt creek and Dogridge 3 Temple Multiple resistant/pierce's disease 4 V. berlandieri Resistant to Phylloxera, and high lime content in the soils but difficult to propagate vegetatively. 5 V. labrusca Cold hardy, resistant to many pests and diseases. 6 V. amurensis Resistant to cold and frost. 7 V. aestivali Resistant to many fungal diseases but susceptible to Phylloxera, best for hot climatic condition.
- 49. Rootstocks of Guava Fruit crops Rootstocks Specific features Guava Pusa Srijan (aneuploidy tetrasomic, 2n+2) Potential for dwarfing, resistant to wilt. P. friendrichsthalianum Dwarfing, resistant to wilt and nematode P. molle Resistant to guava wilt P. Pumilium , P. cujavilis Highly dwarf, high sugar content. Crioula New guava rootstock, it is tolerant to pests and diseases, especially guava rust (Puccinia psidii), tolerant to salinity. Psidium cattleianum Tolerant for low temp.
- 50. Rootstocks of Sapota Fruit crops Rootstocks Specific features Sapota Ryan or Khirni / Pala (Manilkara hexandra) Commercial rootstock in India. Chrysophyllum lanceolatum Wider soil adaptability. Species like Mimusops kauki (Adams apple) , Madhuka lattifolia (Mahua), Bassia longifolia (Mee tree), Chrysophyllum cainito (star apple) and Sideroxylon dulicifolium (Miracular fruit) have been reported as rootstocks for sapota.(Bose,1985).
- 51. Rootstocks of Avocado Fruit crops Rootstocks Specific features Avocado Duke -7 Tolerant to phytophthora root rot Zentmyer, Uzi and Steddom Nachlat Tolerant to lime Pollock Tolerant to salinity
- 52. Salt tolerant rootstocks in different fruit crops Crop Rootstocks Citrus Cleopatra, Gou Tou Cheng Rangpur lime Guava Crioula Grape Dogridge, Salt Creek (syn. ‘Ramsey’) V. berlandieri × V. rupestris (110R, 1103P, 99R, B2/56) 1103 Paulsen Mango 13-1 Gomera-1 M. zeylanica GPL-1 and ML-2 Olour, Nekkare Pomegranate Tab-o-Larz
- 53. Resistant / tolerant rootstocks in fruit crops Crop Rootstocks Resistance/tolerance traits Mango 13-1 Tolerant to salinity Carabao, Resistant to wilt Gomera-1, 13/3,Kurukan, Olour and Bappakkai Tolerant to salinity Guava Psidium friedrichsthalianum P. cattleianum var. lucidum Resistance to root-knot nematode Psidium guineense Resistance to root-knot nematode Crioula Tolerant to salinity Grapes Ramsey, Dog Ridge, Harmony and Freedom Resistance to root-knot nematodes UCD GRN1 and VR O39-16 Resistance to the root lesion nematode Ramsey,Riparia Glorie, 5C screened for salt tolerant Ramsey and 1103 Paulsen Tolerance of phylloxera and nematodes 140Ru Tolerance to water deficit condition Beta and 3309C Cold hardiness A15 and A17 Tolerance to alkalinity Hybrids of V. berlandieri x V. riparia Tolerance to drought 196-17, CH-1, CH-2 Tolerance to salinity
- 54. Resistant / tolerant rootstocks in fruit crops Fruit Crops Rootstocks Resistance/tolerance traits Avocado G755C13-1 Salinity tolerance Duke 7 and G6 Resistance to P. cinnamomi Citrus C. Macrophylla Resistance to salinity Mandarin- Clemenules trees grafted on Carrizo performed well Resistance to salinity Pearl, Mosambi x Kinnow & Mosambi x Nagpur Resistant against citrus pyslla Star ruby and ruby red Resistant against citrus pyslla F & A 418 (Troyer citrange X Cleopatra mandarin) Dwarfing rootstock US 852 Hybrid Selection Phytophthora resistance
- 55. Dwarfing Rootstocks suitable for fruit crops Root stocks are known to have a profound effect on the tree vigour, precocity, quality of fruits, productivity and longevity of varieties grafted on them. Dwarfing can be due to the rootstock or the scion, or both. Dwarfing Rootstocks for fruit crops Crop Dwarfing Rootstock Mango Vellaikolumban (Alphanso), Olour (Himsagar and Langra) Guava Pusa srijan, Psidium friedrichsthalianum. Citrus Trifoliate orange, Sour orange, Flying Dragon
- 56. Research on rootstock should be updated regularly on their targets considering the changes in grower’s and environmental requirements. Low vigour rootstocks predominate in many rootstock breeding projects of different fruit species; however, semi dwarf and moderately vigorous rootstocks also may be applicable in sustainable systems, where year-round grass cover and weed competition should be considered. Increasing fruit growing in new regions will require a different approach in rootstock research. Climate change increases the importance of rootstock adaptability to temperature extremes, cold tolerance, winter hardiness, drought tolerance, water-logging, efficient water utilization and adaptability to suboptimal soil conditions. Challenges in Rootstocks Usage
- 57. Future thrust There is urge to develop new rootstocks which will imparts those qualities in scion cultivar which will provide dwarfing effect, required canopy and ultimately quality fruit yield. To initiate investigation to select suitable rootstock suiting to prevailing soil and climatic conditions for fruit crops. There is an need to evolve rootstocks tolerant to biotic and abiotic stresses in different tropical and subtropical fruit crops.
- 58. Conclusion Rootstocks development is an open unended process. Recent advances in rootstocks management play a crucial role in determining orchard efficiency and sustainability in fruit crops. Rootstocks can influence precocity/ juvenility, yield, tree size control, disease resistance or tolerance, fruit respiratory behavior, crop load and canopy management techniques. Using dwarf rootstock through HDP, yield can be increased in per unit area.
- 59. T H A N K Y O U