Influence of High Temperature on Photosynthesis, Antioxidative Capacity of Chloroplast, and Carbon Assimilation among Heat-tolerant and Heat-susceptible Genotypes of Nonheading Chinese Cabbage
Influence of High Temperature on Photosynthesis, Antioxidative Capacity of Chloroplast, and Carbon Assimilation among Heat-tolerant and Heat-susceptible Genotypes of Nonheading Chinese Cabbage
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高温对不结球白菜耐热和感热基因型光合作用、叶绿体抗氧化能力及碳同化能力的影响
DOI：
10.21273/hortsci12259-17
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发表时间：
2017-11
期刊：
影响因子：
1.9
通讯作者：
Wang Chenggang
中科院分区：
文献类型：
--
作者：
Yuan Lingyun;Yuan Yujie;Liu Shan;Wang Jie;Zhu Shidong;Chen Guohu;Hou Jinfeng;Wang Chenggang
． 高温（HT）是制约无头大白菜过夏产量的主要环境胁迫。对牧野)。在本研究中，研究了高温对两个NHCC‘xd’（耐热）和‘sym’（热敏感）光合能力的影响，包括光反应和碳同化。两个基因型在植株形态、光合能力和光合产物代谢（碳同化）方面表现出显著差异。高温胁迫导致NHCC光合作用、叶绿素含量和光化学活性降低。而净光合速率（pn）、PSII最大光化学效率（Fv/Fm）和总叶绿素含量等主要光合相关参数均显著高于sym。‘xd’叶绿体抗坏血酸还原性谷胱甘肽循环的抗氧化剂含量和抗氧化酶活性显著高于‘sym’。显微分析表明，高温对光合机构的结构和膜的完整性有不同程度的影响，而“xd”能保持较好的叶绿体形状和类囊体的完整性。抑制光反应
. High temperature (HT) is a major environmental stress limiting oversummer production of nonheading Chinese cabbage (NHCC, Brassica campestris ssp. chinensis Makino). In the present study, the effects of HT on photosynthetic capacity, including light reaction and carbon assimilation, were completely investigated in two NHCC, ‘xd’ (heat-tolerant), and ‘sym’ (heat-susceptible). The two genotypes showed significant differences in plant morphology, photosynthetic capacity, and photosynthate metabolism (carboassimilation). HT caused a decrease in photosynthesis, chlorophyll contents, and photochemical activity in NHCC. However, these main photosynthetic-related parameters, including net photosynthetic rate (P N ), maximal photochemical efficiency of PSII (Fv/Fm), and total chlorophyll content in ‘xd’, were significantly higher than those of ‘sym’ plants. The antioxidant contents and antioxidative enzyme activities of ascorbic acid-reduced glutathione cycle in the chloroplast of ‘xd’ were significantly higher than those of ‘sym’. Microscopic analyses revealed that HT affected the structure of photosynthetic apparatus and membrane integrity to a different extent, whereas ‘xd’ could maintain a better integrated chloroplast shape and thylakoid. Inhibited light reaction
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