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http://dx.doi.org/10.5010/JPB.2005.32.3.181

Changes of Root Physiology of Tissue Cultured M.9 Apple Rootstock after Layering  

Kwon Soon-Il (National Apple Experiment Station, NHRI, RDA)
Kim Mok-Jong (Fruit Research Division, NHRI, RDA)
Kang In-Kyu (Dept. of Environmental Hotrticulture, Sangju National Univ.)
Publication Information
Journal of Plant Biotechnology / v.32, no.3, 2005 , pp. 181-186 More about this Journal
Abstract
This work was conducted to evaluate the effects of rooting on tissue cultured M.9 (Malus domestica Bork. cv, tcM.9) after layering in field. We investigated an appearance period of first root in shoot, rooting ratio, contents of indole-3-acetic acid (IAA), abscisic acid (ABA), inorganic matters, sugars, and lignin in rooting areas of stems by layering. First root in shoot of tcM.9 and natural M.9 appeared 25 and 30 days after layering (DAL), respectively. Rooting ratio was much higher in tcM.9 than in natural M.9. The content of IAA was higher in tcM.9 than in natural M.9 before layering, but it was reversed at 20 and 30 DAL. In contrast, the content of ABA was much higher in natural M.9 than in tcM.9 in case of both before and 10 and 20 DAL. The contents of N, B, Mn, and Zn were significantly higher in tcM.9 than in natural M.9 both before and 10 and 20 DAL. The contents of sugars in tcM.9 had the similar pattern of the contents of inorganic materials. There were statistically significant differences in the contents of sucrose and glucose at 30 DAL as well as the content of maltose at 20 and 30 DAL. The content of lignin was significantly higher in tcM.9 than in natural M.9 before layering and 10 and 30 DAL while there was no difference 20 DAL. Therefore, improvement of rooting ability in the tissue cultured root stock M.9 might be due to the changes of inorganic matters or lignin rather than that of sugars and hormones.
Keywords
Hormone; in vitro culture; layering; lignin; rooting;
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