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KMID : 0578319920020010103
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Molecules and Cells
1992 Volume.2 No. 1 p.103 ~ p.108
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Changes in Endogenous Cytokinins during Root Development in Seedlings of Phaseolus vulgaris L.
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kim, Sang-Gu
Jeong, Soon-chun/kwon, Young Myung
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Abstract
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The changes in endogenous cytokinins during development of the seedling roots of Phaseolus vulgaris were investigated. Root differentiation during seedling development was divided into taproot, secondary root, and tertiary root stages. In each stage, the cytokinin content of the roots was analyzed using HPLC coupled to the tobacco pith callus bioassay. Major cytokinins in each stage were zeatin, O-glucosylzeatin, and zeatin riboside. The cytokinin level per gram fresh weight was similar for all stages of root development. Exogenous kinetin, at concentrations higher than 1 M, inhibited both fresh weight increase in the whole root and the rate of elongation in the taproot of P vulgaris seedlings. The effect of kinetin on the increase in root dry weight was less than the effect on fresh weight, and thickening of the root was observed at high kinetin concentrations. These results indicate that continuous synthesis of cytokinins occurs in the root during development and that cytokinin levels are maintained homeostatic during the root development.
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