%0 Journal Article
%T Difference in seedlings ammonium assimilation of wheat cultivars with different drought resistance under osmotic stress<br>渗透胁迫下不同抗旱性小麦幼苗氨同化差异
%A 张慧娜
%A 王志强
%A 崔国金
%A 林同保
%J 应用生态学报
%D 2009
%I 
%X Taking wheat cultivars drought-resistant Luohan-6 and drought-sensitive Zhoumai-18 as test objects, their seedlings ammonium assimilation enzyme activities and related parameters were determined under osmotic stress. The plant biomass had an obvious decrease under osmotic stress, with a larger decrement for Zhoumai-18 than Luohan-6. Osmotic stress increased the plant ammonium content, especially for Zhoumai-18. The glutamine synthetase (GS) activity varied with wheat cultivars. For Luohan-6, the GS activity increased significantly under low osmotic stress but decreased under high osmotic stress; while for Zhoumai-18, the GS activity decreased with increasing osmotic stress. The NADH-dependent glut amate dehydrogenase (NADH-GDH) increased with increasing osmotic stress, with a marked increment under low osmotic stress for Zhoumai-18, and under high osmotic stress for Luohan-6. The NAD+-dependent glutamate dehydrogenase (NAD+-GDH) and NADP-dependent isocitrate dehydrogenase (NADP-ICDH) activities also increased with increasing osmotic stress, with a greater increment of NAD+-GDH activity for Zhoumai-18, and of NADP-ICDH activity for Luohan-6. It was suggested that the increased drought resistance of wheat plants could be related to the incre ased ammonium assimilation resulted from the enhanced GS and NADH-GDH activities under low and high osmotic stress, respectively.
%K wheat
%K drought resistance
%K osmotic stress
%K ammonium assimilation<br>小麦
%K 抗旱性
%K 渗透胁迫
%K 氨同化
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=A35D31E81108EFDC3939DA55FE37A008&yid=DE12191FBD62783C&vid=A04140E723CB732E&iid=F3090AE9B60B7ED1&sid=FC88349D0A03DF78&eid=469954E24DF51E19&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=0&reference_num=0