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大豆科学  2008 

UV-B胁迫对大豆幼苗光呼吸的影响

DOI: 10.11861/j.issn.1000-9841.2008.03.0447, PP. 447-450

Keywords: UV-B辐射,大豆幼苗,光呼吸速率

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Abstract:

紫外辐射对农作物的生态效应是影响农业生产的重要问题。为研究紫外辐射对农作物光呼吸的影响,在温室模拟增强紫外辐射UV-B(280~320nm)环境下,以大豆(Glycinemax)为材料,用溶液培养试验法研究UV-B胁迫对大豆幼苗光呼吸速率(Pr),光合速率(Pn),乙醇酸氧化酶(GO)和谷胺酰胺合成酶(GS)的影响。结果表明:在UV-B胁迫下,光呼吸关键酶GO和GS活性显著提高,大豆幼苗的Pr显著提高,Pn显著降低,光呼吸关键酶GO和GS活性的显著提高导致了Pr的显著提高。T1和T2组Pr与Pn的动态变化表明,UV-B辐射与Pr、Pn间存在明显的剂量效应。因此,UV-B胁迫可以通过对光呼吸关键酶的影响调控光呼吸速率的变化。

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