Effect of Drought Stress on Non-structure Carbohydrate Metabolism of Wheat and Its Relationship with Drought Resistance

doi:10.7668/hbnxb.2015.02.035

Abstract

Abstract: In order to study the relationship between non-structure carbohydrate and drought sensitive coefficient under drought stress.The variation of non-structure carbohydrate contents in leaves and roots of six wheat varieties were studied under two dought stress treatments (15% PEG and 20% PEG), taking the normal solution management as control (CK).The results displayed that the dry matter weight decreased under drought stress.The drought sensitivity of six wheat varieties was Jinmai 47(JM47) > Aikang 58(AK58) > Zhoumai 22(ZM22) > Luohan No.6 (LH6) > Zhengmai 9023(ZM9023) > Xinong 979(XN979) for both 15% PEG and 20% PEG treatments.The contents of total soluble sugar, glucose, fructose and sucrose increased first and then decreased with the extension of drought stress time, while the contents of starch and fructan decreased all the way.The non-structure carbohydrate contents in leaves and roots approximated the level of CK after rewatering.The varieties with higher drought sensitivity had less change rate of non-structure carbohydrate contents.The drought sensitive coefficient had negative correlation with the change rate of non-structure carbohydrate contents.The correlations of drought sensitive coefficient with the change rate of soluble total sugar, fructose, starch and fructan was significant.The degradation of starch and fructan under drought stress played an important role in improving the drought resistance of wheat.

Key words: Wheat, Drought stress, Carbohydrate metabolism, Dry matter, Drought resistance

CLC Number:

S512.01

GUO Rui-pan, XIN Ze-yu, WANG Zhi-qiang, GUO Xiao-yang, ZHANG Li-ting, WANG Jun-zhe, LIN Tong-bao. Effect of Drought Stress on Non-structure Carbohydrate Metabolism of Wheat and Its Relationship with Drought Resistance[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2015, 30(2): 202-211. doi: 10.7668/hbnxb.2015.02.035.

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