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Shahrokh Khanizadeh, Yvon Groleau, Odile Carisse, Vicky Toussaint, Raymond Granger, and Gilles Rousselle

Origin ‘SJM44’ (St-Jean Morden 44) is a new dwarfing rootstock resulting from a cross made in 1960 between Malus baccata ‘Nertchinsk’ and ‘M.9’ (‘Malling 9’, clonal selection of Paradis jaune de Metz). It was developed at the Agriculture and

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High-density Peach Production Systems Are More Economical The lack of dwarfing rootstocks for peach has led to cultural and genetic approaches that reduce tree size and vegetative growth to establish high-density plantings. Glenn et al. (p. 720

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Hisayo Yamane, Megumi Ichiki, Ryutaro Tao, Tomoya Esumi, Keizo Yonemori, Takeshi Niikawa, and Hino Motosugi

, TTN showed dwarf growth characteristics in all growth environments examined in this study. A dwarf phenotype in fruit trees is favored by farmers because of their ease of management ( Faust and Zagaja, 1984 ). Indeed, dwarfing rootstocks have been bred

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Jiangbo Dang, Tingrong Wu, Guolu Liang, Di Wu, Qiao He, and Qigao Guo

selection for dwarfing ( Feungehum, 1975 ). An aneuploid guava line No. 82 was verified to be a substantial dwarfing rootstock without yield reduction ( Sharma et al., 1992 ). In pears, some dwarfing rootstocks were found to be aneuploids ( Simard and

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Marlene Ayala, Lorena Mora, and Joaquín Torreblanca

High-density sweet cherry ( Prunus avium L.) orchards that use dwarfing rootstocks require pruning and crop load regulation to promote appropriate LA:F ratio that guarantee high-quality fruit ( Ayala and Andrade, 2009 ; Ayala and Lang, 2004

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Sudip Kunwar, Jude Grosser, Fred G. Gmitter Jr., William S. Castle, and Ute Albrecht

location may be attributable to this location being part of the Central Florida Ridge, an ancient sand dune representing the highest elevation in Florida, and its characteristic sandy soils. Trees on some of the dwarfing rootstocks leaned more than trees on

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Jaume Lordan, Anna Wallis, Poliana Francescatto, and Terence L. Robinson

been focused on dwarfing rootstocks for high-density plantings rather than semidwarf for mid-densities ( Autio et al., 2011 ; Fazio, 2014 ; Fazio et al., 2014 ; Marini et al., 2014 ). However, the use of semidwarfing rootstocks for mid

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Ben van Hooijdonk, David Woolley, Ian Warrington, and Stuart Tustin

were found in the xylem sap of apple trees ( Jones and Lacey, 1968 ; Motosugi et al., 1996 ), indicating that apple roots also synthesize and supply gibberellins to the scion. Compared with vigorous rootstocks, dwarfing rootstocks had lower endogenous

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Dario Stefanelli, Roberto J. Zoppolo, Ronald L. Perry, and Franco Weibel

between the other two rootstocks ( Fig. 3 ). It is well known that trees on dwarfing rootstocks bear fruit earlier than vigorous rootstocks ( Webster, 2000 ). M.9 RN 29 appears to be a rootstock that adapts better to the less favorable growing conditions

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standards. Growth and Flowering Control of Young Pecan Trees Due to the strongly vegetative nature of relatively young pecan trees and the absence of dwarfing rootstocks or varieties, controlling tree size is a major problem in high-density pecan orchards