ISHS Acta Horticulturae 774: XXVII International Horticultural Congress - IHC2006: International Symposium on Endogenous and Exogenous Plant Bioregulators
DYNAMICS OF ENDOGENOUS CYTOKININS DURING PHASE CHANGE IN MALUS DOMESTICA BORKH |
| Authors: | Xin Zhong Zhang, Yong Bo Zhao, Guang Peng Wang, Rui Feng Chang, Chun Min Li, Huai Rui Shu |
| Keywords: | cytokinins, apple, distribution, phase change, leaf, bark |
| Abstract:
In order to identify the dynamics of endogenous cytokinins during phase change in hybrid seedlings of apple, cytokinins in leaves and the bark of two-year-old seedlings ('Jonathan' × 'Golden Delicious') were extracted and analyzed by high performance liquid chromatography. The results indicated that a higher level of zeatin (ZT) content was found from node nos. 81-85 to nos. 121-125 in bark samples, indicating that the seedlings were at special physiological stages. No significant variations of dihydrozeatinriboside (DHZR) contents in leaf were found except a sharp decrease between node nos. 81-85 and nos. 116-120. The N6-isopentenyladenine (iP) content in the bark peaked from the node nos. 101-105 to nos. 121-125. The dynamics of ZT in the bark and DHZR in leaves could be quantitative markers of the adult vegetative phase in apple seedlings. | |
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