乾燥ストレス下のササゲとインゲンマメの根、葉、胚軸の水の動態比較

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  • Characteristics of Water-related Parameters of Roots, Leaves and Hypocotyls in Cowpea under Drought Stress Compared with Common Bean

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Dynamic characteristics of water in organs such as roots, leaves and hypocotyls in cowpea (Vigna unguiculata (L.) Walp) under drought stress were evaluated by comparing with that of related species, common bean (Phaseolus vulgaris L.) with ^1H-NMR relaxation times (T_1 and T_2). There was no difference between T_1 and T_2 of cowpea roots under drought stress for two days while those of common bean significantly decreased. Regarding leaves, although T_2 values and water content of cowpea roots maintained the initial level, these parameters of common bean significantly decreased during four days of water deficit. Water content and T_1 of hypocotyls of drought cowpea slightly decreased on the eighth days after withholding water, while hypocotyls retained water longer compared with roots and leaves under water deficit. In addition, the electric conductivity indicated that hypocotyl tissues of cowpea under drought stress for eight days were not injured while those of common bean were partly injured under drought stress for four days. Higher water mobility indicated by long T_1 in fresh cowpea hypocotyls might play an important role in maintaining integrity of cowpea organs against drought stress.

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