Photosynthesis, respiration and antioxidant enzymes in pepper leaves under drought and heat stresses
Photosynthesis, respiration and antioxidant enzymes in pepper leaves under drought and heat stresses
复制标题
干旱和热胁迫下辣椒叶片的光合作用、呼吸作用和抗氧化酶
DOI：
10.1007/s10535-010-0137-5
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发表时间：
2010-12-01
影响因子：
1.5
通讯作者：
Hu, X. H.
中科院分区：
文献类型：
--
作者：
Hu, W. H.;Xiao, Y. A.;Hu, X. H.
研究了在干旱（D）和高温（H）以及干旱和高温混合（HD）下生长的两个辣椒（Capsicum annuumL.）品种的叶片气体交换、叶绿素荧光和抗氧化酶活性。耐旱的品种。与干旱敏感品种相比，郑椒13号表现出更高的净光合速率（PN）和细胞色素呼吸途径活性（RSHAM），以及更低的超氧自由基和过氧化氢含量。龙口早教。在 D 和 HD 条件下，两个品种的 PN 和 RSHAM 均减少，ROS 产量增加。与龙口早教相比，郑教13号在D和HD下保留了更高的非光化学猝灭（NPQ）、光呼吸速率（RL）和替代呼吸途径（RKCN）。干旱增加了两个品种细胞质、叶绿体和线粒体中超氧化物歧化酶（SOD）和抗坏血酸过氧化物酶（APX）的活性。尽管HD处理下龙口早教SOD和APX活性下降，但郑教13号SOD活性增加。由于RL、NPQ、RSHAM、RKCN以及SOD和APX活性增加，没有H诱导的活性氧产生。然而，H 略微降低了 PN。结果表明，HD 比单独的压力更有害。
Leaf gas exchange, chlorophyll fluorescence and activities of antioxidant enzymes were studied in two pepper (Capsicum annuumL.) cultivars grown under drought (D) and heat (H), as well as under drought and heat in combination (HD). The drought-tolerant cv. Zhengjiao 13 exhibited greater net photosynthetic rate (PN) and cytochrome respiratory pathway activity (RSHAM), and lower contents of superoxide radical and hydrogen peroxide, as compared to the drought-sensitive cv. Longkouzaojiao. The PNand RSHAMdecreased and ROS production increased under D and HD in both cultivars. As compared to the Longkouzaojiao, Zhengjiao 13 retained higher non-photochemical quenching (NPQ), photorespiration rate (RL), and alternative respiratory pathways (RKCN) under D and HD. Drought increased the superoxide dismutase (SOD) and ascorbate peroxidase (APX) activities in the cytosol, chloroplasts and mitochondria in the two cultivars. Although SOD and APX activities decreased in Longkouzaojiao under HD, SOD activity increased in Zhengjiao 13. There was no H-induced reactive oxygen species production due to increase of RL, NPQ, RSHAM, RKCNand activities of SOD and APX. However, H slightly decreased the PN. The results indicated that HD was more detrimental than either stress alone.