土壤干旱对不同小麦品种籽粒淀粉积累和相关酶活性的影响

王征宏; 郭秀璞; 吕淑芳; 李友军; 邓西平

Effects of soil drought on starch accumulation of grain and activity of corresponding starch synthesis enzymes in different winter wheat varieties

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DOI：10.7606/j.issn.1000-7601.2011.03.13

Key Words: winter wheat (Triticum aestivum L. ) soil drought starch synthesis enzyme activity

Author Name	Affiliation
WANG Zhenghong	Agricultural College，Henan University of Science and Technology，Luoyang， Henan 471003，China State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, NorthuvestA & F Uniwersity，Yangling ，Shaanxi 712100，China
GUO Xiupu	Agricultural College，Henan University of Science and Technology，Luoyang， Henan 471003，China
LV Shufang	Agricultural College，Henan University of Science and Technology，Luoyang， Henan 471003，China
LI Youjun	Agricultural College，Henan University of Science and Technology，Luoyang， Henan 471003，China
DENG Xiping	State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, NorthuvestA & F Uniwersity，Yangling ，Shaanxi 712100，China

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Abstract:

Two types of winter wheat (Triticum aestioum. L)，including dryland cultivar Changwu 134 and irrigated land cultivar Shaan 253，were selected to study the effects of soil drought on starch accumulation of grain and activity of corresponding starch synthesis erzymes，and then to elucidate some physiological mechanisms of wheat grain filling under soil drought condition. The results indicated that soil drought could significantly increase the starch accumulation rate and SS，AGPase, UGPase，SSS and GBSS activity of grains in two different varieties during the early filing stage. The extent of reduction in the grain starch accumulation rate and the activity of AGPase and UGPase of the dryland cultivar was sig-nificantly higher than that of the the irrigated cultivar， but the SS activity of dryland cultivar was significantly lower than that of irigated cultivar during the late flling stage. The SSS activity of drought- treated grains in dryland cultivar didn’ t have obvious changes，but significant increase occurred in irigated cultivar as compared to control. Compared with oth- er starch synthesis enzymes, the GBSS activity was affected slightly by soil drought treatment during the late flling stage. Analysis results indicated that SS and AGPase might be the key regulatory enzymes affecting grain starch accumulation rate，and AGPase played a main role for drought: resistant cultivar. But for the drought: sensitive cultivar, SS could be a determinant enzyme.