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Physiological Changes in Rooting Zone of Dwarf Apple Rootstocks (Malus domestica Borkh.) after Stem Etiolation Treatment  

Kwon, Soon-Il (National Apple Experiment Station, NHRI)
Kim, Mok-Jong (National Apple Experiment Station, NHRI)
Paek, Pong-Nyol (National Apple Experiment Station, NHRI)
Nam, Jong-Chul (National Apple Experiment Station, NHRI)
Kang, In-Kyu (Dept. of Environmental Horticulture, Sangju National Univ.)
Publication Information
Journal of Bio-Environment Control / v.16, no.2, 2007 , pp. 151-156 More about this Journal
Abstract
This work was conducted to investigate the important rooting factors through comparative analysis of a physiological differentiation after layering treatment using four apple rootstocks of different rooting abilities; M.26, M.9, O.3, and Mo.84. Mo.84 showed the highest rooting rate in from rootstocks, while O.3 was the lowest. Mo.84 also found to have the highest indole-3-acetic acid (IAA) content, although the fluctuation of IAA contents was not consistent with layering treatment. In contrast, abscisic acid (ABA) content of Mo.84 which showed highest rooting was lowest among rootstocks regardless of layering treatment. And ABA contents of all rootstocks were decreased after layering treatment than before layering treatment. O.3 which showed poor rooting rate revealed lowest in boron content. Carbohydrate/nitrogen (C/N) ratio of Mo.84 was the highest in all rootstocks. Therefor, we assumed that he IAA contents in layering treated rootstocks were not seemed to be a major rooting factor, but the changes in ABA contents and boron levels limit rooting in dwarf apple rootstocks.
Keywords
ABA; apple; C/N ratio; dwarf rootstock; IAA; mineral element; rooting;
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