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UV-B辐射强度变化对冬小麦碳氮代谢的影响

Keywords: UV-B,冬小麦,碳氮代谢,呼吸系数

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Abstract:

采用室内盆栽实验的方法,研究了UV-B辐射强度改变对冬小麦拔节孕穗期、抽穗期碳氮代谢的影响。结果表明:(1)UV-B辐射增强显著减少小麦拔节孕穗期和抽穗期地上部分干重,以及小麦拔节孕穗期地上部分呼吸速率,而对小麦两个生育期的呼吸系数无显著影响。UV-B增强显著减少了小麦拔节孕穗期和抽穗期叶片中叶绿素a含量,增加类胡萝卜素含量,减少拔节孕穗期叶片中光合产物可溶性糖的含量;(2)UV-B增强对小麦叶片中N代谢过程的影响表现为促进作用,虽对小麦抽穗期叶片硝酸还原酶活性、硝态氮含量无显著影响,却促进谷氨酰胺合成酶活性,显著增加了拔节孕穗期和抽穗期叶片中可溶性蛋白质、游离氨基酸含量。

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