Photosynthetic characteristics and antioxidant enzyme system in high-chlorophyll rice Gc mutant
Photosynthetic characteristics and antioxidant enzyme system in high-chlorophyll rice Gc mutant
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高叶绿素水稻Gc突变体光合特性及抗氧化酶系统
DOI：
10.1134/s1021443712050123
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发表时间：
2012-08
影响因子：
1.4
通讯作者：
Wang, G. X.
中科院分区：
文献类型：
--
作者：
Niu, X. D.;Li, G. R.;Kang, Z. H.;Huang, J. L.;Wang, G. X.
高叶绿素水稻的光合生理特性及抗氧化酶系统对突变体（Gc）和野生型（珍汕97 B）进行了比较分析。结果表明，Gc突变体的总叶绿素（Chl）和Chl B含量分别比对照显著提高了19.0%和81.7%，而Chl a和类囊体膜蛋白含量的提高不显著。突变体的净光合速率（PN）显著高于对照;气孔导度、胞间CO2浓度和蒸腾速率显著降低，水分利用效率显著提高，表明突变体具有更高的光化学效率。突变体的叶绿素荧光参数、电子传递速率和PSII光化学有效量子产率均显著高于珍汕97 B。光适应下突变体的非光化学猝灭增加了52.3%。超氧化物歧化酶、过氧化物酶和过氧化氢酶活性在突变体根和叶中均高于野生型。突变体中抗氧化酶活性的提高可能是导致叶绿素光失活困难，从而提高叶绿素含量，特别是叶绿素B含量的重要因素。
The physiological photosynthetic characteristics and antioxidant enzyme system of the high-chlorophyll rice (Oryza sativa L.) mutant (Gc) and its wild type (Zhenshan 97B) were compared and analyzed. Resulting data showed that the total chlorophyll (Chl) and Chl b contents in the Gc mutant were significantly increased by 19.0 and 81.7%, respectively, while the increase in Chl a and thylakoid membrane protein contents was insignificant. The net photosynthetic rate (PN) was significantly higher in the mutant; stomatal conductance, intercellular CO2 concentration, and transpiration rate decreased significantly, and water-use efficiency increased significantly, indicating the higher photochemical efficiency of the mutant. The chlorophyll fluorescence parameters: electron transport rate and effective quantum yield of PSII photochemistry of the mutant were significantly higher than those of Zhenshan 97B. The nonphotochemical quenching of the mutant under light adaptation increased by 52.3%. The enzymatic activity of superoxide dismutase, peroxidas, and catalase in the mutant roots and leaves were all higher than those for the wild-type plants. It is believed that the higher activity of antioxidant enzymes in the mutant may be an important factor making difficult the photo-inactivation of Chl, and thus, increasing the content of Chl, especially Chl b.
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