Change of Water Metabolism and Two Osmotic Adjustment Substances in the Leaves of Alfalfa under Drought Stress

doi:10.7668/hbnxb.2008.04.032

Abstract

Abstract: In this study Longdong( strong drough- t resistance) Gongnong No 1( medium drough- t resistance) and BL -02 - 329( weak drough- t resistance) were chosen as experimental material to study the change of water metabolism and two os - motic adjustment substances in the leaves of alfalfa under drought stress.The results showed: the water potential and water relative content in the leaves of alfalfa decreased and water saturated deficit in the leaves of alfalfa increased under drought stress.There were higher decrease extent of water potential and lower decrease extent of water relative content in the leaves of strong drough- t resistance alfalfa under drought stress. At the same time the proline content and soluble sugar content increased in the leaves of three alfalfa, the two substances both have adjustive function to three alfalfa under drought stress. Proline is the main adjustment substance and the content and the increase extent can reveal drough- t resis - tant of alfalfa cultivars.

Key words: Drough stress, Alfalfa, Leaf, Water metabolism, Osmotic adjustment

CLC Number:

S551+.7

HAN Rui-hong, TIAN Hua, GAO Gui-juan, LU Xin-shi. Change of Water Metabolism and Two Osmotic Adjustment Substances in the Leaves of Alfalfa under Drought Stress[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2008, 23(4): 140-144. doi: 10.7668/hbnxb.2008.04.032.

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