| 胡文海,闫小红,高翔.交替呼吸途径防御弱光干旱下辣椒叶片光抑制的作用研究[J].井冈山大学自然版,2017,(5):24-28 |
| 交替呼吸途径防御弱光干旱下辣椒叶片光抑制的作用研究 |
| PROTECTIVE ROLES OF ALTERNATIVE OXIDASE PATHWAY TO PHOTOINHIBITION INDUCED BY DROUGHT WITH LOW LIGHT IN PEPPER LEAVES |
| 投稿时间：2017-06-06 修订日期：2017-08-12 |
| DOI：10.3969/j.issn.1674-8085.2017.05.006 |
| 中文关键词: 辣椒 弱光干旱 交替呼吸途径 光抑制 叶绿体能量代谢 |
| 英文关键词: pepper drought with low light alternative oxidase pathway photoinhibition chloroplastic energy metabolism |
| 基金项目:国家自然科学基金项目（31460513）；江西省科技支撑计划项目（20161BBF60064） |
| 作者 | 单位 | | 胡文海 | 井冈山大学生命科学学院, 江西, 吉安 343009
江西省生物多样性与生态工程重点实验室, 江西, 吉安 343009 | | 闫小红 | 井冈山大学生命科学学院, 江西, 吉安 343009
江西省生物多样性与生态工程重点实验室, 江西, 吉安 343009 | | 高翔 | 井冈山大学生命科学学院, 江西, 吉安 343009 |
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| 中文摘要: |
| 以超辣9号辣椒品种为实验材料，采用聚乙二醇（PEG）模拟干旱胁迫，并利用水杨基氧肟酸（SHAM）抑制交替呼吸途径活性，研究了交替呼吸途径在防御弱光干旱（200 μmol · m-2 · s-1 PAR，15% PEG）下辣椒叶片光抑制中的作用。结果表明：弱光干旱处理降低了辣椒叶片光化学能力，但诱导了热耗散和环式电子传递等能量耗散途径的增强，其光抑制程度较低；弱光干旱胁迫并未诱导辣椒叶片交替呼吸途径活性的明显上升，抑制交替呼吸途径后也未明显加剧光抑制程度；抑制交替呼吸途径虽然进一步降低了光化学能力，但也显著促进了热耗散和环式电子传递的进行。由此可见，弱光干旱胁迫下辣椒叶片主要通过热耗散和环式电子传递等叶绿体能量耗散途径防御光抑制的发生，交替呼吸途径并未起到明显作用。 |
| 英文摘要: |
| In order to study the protective roles of alternative oxidase pathway (AOX pathway) in photoinhibition induced by drought with low light (200 μmol·m-2·s-1 PAR, 15%PEG) in pepper leaves, a pepper cultivar "Chaola No.9" was selected as experimental material, and the AOX inhibitor salicylhydroxamic acid (1 mM; SHAM) was used to inhibit AOX activity in vivo. The results indicated that photochemical reaction decreased in leaves treated by drought with low light, however, only slight photoinhibition was occurred because of the increase of thermal energy dissipation and cyclic electron flows around photosystem I. Leaf AOX pathway was not up-regulated after drought with low light, and photoinhibition was not obviously deteriorated by inhibition of AOX pathway. Inhibition of AOX pathway under drought with low light decreased photochemical reaction, but increased thermal energy dissipation and cyclic electron flows around photosystem I. Taken together, pepper leaves could increase chloroplastic energy dissipation pathways to alleviate photoinhibition induced by drought with low light, however, AOX pathway did not play a significant protective role. |
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