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Sawyer N. Adams, Walter O. Ac-Pangan and Lorenzo Rossi

citrus ‘US-942’ rootstock reacted to salinity, which has not been studied before ( Bowman and McCollum, 2010 ). Should ‘US-942’ rootstock react similarly to the other plant species that have been tested, the apoplastic barriers will develop closer to the

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Kevin Fort, Joaquin Fraga, Daniele Grossi and M. Andrew Walker

The use of rootstocks in viticulture was initiated in response to the widespread destruction of European vineyards after the inadvertent introduction of the grape phylloxera ( Daktulosphaira vitifoliae ) during the mid-19th century ( Ordish, 1972

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David H Suchoff, Christopher C. Gunter, Jonathan R. Schultheis, Matthew D. Kleinhenz and Frank J. Louws

grafting. Essentially a root transplant, grafting offers the ability to manage numerous soil-borne pathogens that affect solanaceous and cucurbitaceous crops ( Louws et al., 2010 ). Furthermore, recent work has demonstrated the ability of rootstocks to

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Haishan An, Feixiong Luo, Ting Wu, Yi Wang, Xuefeng Xu, Xinzhong Zhang and Zhenhai Han

depth) impact the reproductive and vegetative growth of apple trees ( Yao et al., 2006 ). Detailed knowledge about fine root production, mortality, and spatial distribution of dwarfing rootstocks is currently insufficient to understand the dwarfing

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Hisayuki Kudo and Takeo Harada

, because most fruit trees and many vegetables are grafted ( Lee, 1994 ). So we grafted potato ( Solanum tuberosum L.) scions onto Me tomato rootstock to test whether the RNA molecule can move from Me tomato and whether it alters the potato leaf

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Ismail A. Hussein and Donald C. Slack

The effect of three vigor-control apple (Malus domestics Borkh.) rootstock (seedling, MM.106, and M.7a) on fruit diameter of three cultivars ('Red Delicious', `Granny Smith', and `Gala') was studied over two growing seasons (1990-91) in the arid climate of Willcox, Ariz. Daily fruit growth rate (DFGR) and effective fruit growth period (EFGP) data indicate cultivar differences in DFGR as well as EFGP. Cultivars with a high DFGR had a relatively shorter EFGP. Rootstock had no significant effect on EFGP. Cultivar x rootstock interaction on fruit diameter was significant for DFGR, but not for EFGP. `Red Delicious' and `Granny Smith' trees produced larger fruits on MM.106 and M.7a than on seedling rootstock. For `Gala', there was no significant effect of all rootstock on fruit diameter.

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G.E. Boyhan, J.D. Norton and J.A. Pitts

The dwarfing characteristics of St. Julien and Pixy rootstocks, measured by shoot growth, were evident with `AU-Amber' and `AU-Producer' plum (Prunus salicina Lindl.) scions. Dwarfing did not occur with `AU-Rubrum'. Trunk cross-sectional area (TCA) was reduced with `AU-Amber', `AU-Producer', and `AU-Rubrum' scions on St. Julien and Pixy rootstocks. After 3 years, tree survival was 94% for Lovell; 89%, Halford; 57%, Nemaguard; 75%, Nemared; 83%, St. Julien; and 47%, Pixy. Tree survivability was significantly lower on Nemaguard and Pixy rootstocks than on Lovell and Halford. Multiple regression of total shoot growth, TCA, and survivability against foliar nutrient content resulted in the following significant equations: 0.460Mg - 0.210Mn, 0.236B - 0.487Mn, and 0.359N + 0.398Ca - 0.267P - 0.360Fe for each, respectively. Growth, survivability, and foliar nutrient content are significantly affected by rootstock in plum production.

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C.G. Embree, B.H. Lesser and A.D. Crowe

The effects of 30 Kentville Stock Clone (KSC) selections on fruit size and color of `McIntosh' and `Delicious' apples (Malus domestica Borkh.) were monitored over 5 years. Fruit size was influenced by the rootstock and, when averaged over the duration of the study, ranged from 108 to 132 g and 131 to 161 g for `McIntosh' and `Delicious', respectively. Variation in fruit size due to crop load (CL) was greater for `McIntosh' than for `Delicious'. Fruit color was influenced by the rootstock in all years for `McIntosh' and in 3 of 5 years for `Delicious'; it was strongly associated with tree size for `Delicious' only. An overall performance index, which also included price based on quality, was developed, and the best performers in each size group were: semidwarf KSC 18 and 28; semivigorous KSC 7, 11, and 24; and vigorous KSC 3 and 6.

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Peter Cousins

1 Grape rootstock breeder and geneticist.

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Terence L. Robinson and William C. Johnson

79 WORKSHOP 10 (Abstr. 667–668) Tree Fruit Rootstocks: Current Materials and Future Trends