超高产杂交稻剑叶衰老过程中的抗氧化性的变化

Changes in Antioxidant Capacity during Senescence of Flag Leaves in Super High-yielding Hybrid Rice

摘要:

与对照种汕优63相比,超高产水稻组合培矮64S/E32的剑叶在生长后期具有更高的抗氧化酶(抗坏血酸过氧化物酶APX和谷胱甘肽还原酶GR)活性和小分子抗氧化剂(抗坏血酸Vc、总Vc、还原型谷胱甘肽GSH和β-胡萝卜素)含量,高的清除有机自由基 DPPH·能力,更低的膜脂过氧化产物丙二醛含量。这表明培矮64S/E32剑叶在生长后期有强的抗氧化性,这种强抗氧化性与超高产水稻在结实后期剑叶中较慢的叶绿素和蛋白质降解速度相一致。

Abstract:

Compared to variety Shanyou 63, super high-yielding hybrid rice Pei'ai 64S/E32 had higher activities of ascorbate peroxidase and glutathione reductase, higher antioxidant contents (Vc, total Vc, reduced glutathione, and β-carotene), and higher capacity of scavenging organic free radical, but less content of malondialdehyde (a product of membrane-lipid peroxidation) in flag leaves at late development stage. It was shown that the flag leaves of Pei'ai 64S/E32 at late stages have strong antioxidant capacity, which coincided with the lower degradation of chlorophyll and protein contents in this hybrid at late seed setting stage.