低温胁迫下交替呼吸途径对当归幼苗叶绿素荧光活性的影响
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引用本文:张牡丹,达梦婷,冉瑞兰,赛闹汪青,贾凌云,冯汉青.低温胁迫下交替呼吸途径对当归幼苗叶绿素荧光活性的影响[J].西北植物学报,2019,39(4):685~691
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张牡丹,达梦婷,冉瑞兰,赛闹汪青,贾凌云,冯汉青1* (西北师范大学生命科学学院兰州 730070) 
基金项目:国家自然科学基金项目(31870246,31560070);
中文摘要:以岷当归幼苗为材料,通过温室盆栽试验研究了在低温(4 ℃和-7 ℃)胁迫下交替呼吸途径对当归幼苗叶片叶绿素含量和荧光特性的影响,探讨交替呼吸途径在当归响应低温逆境过程中的作用。结果表明,随着胁迫温度的降低和处理时间的延长,当归叶片的叶绿素含量、实际光化学效率[Y(Ⅱ)]、光合电子传递速率(ETR)及光化学淬灭系数(qL)逐渐降低,而非光化学猝灭系数(NPQ)升高;同时,低温胁迫也导致当归幼苗叶片交替呼吸容量显著升高;在低温胁迫下,经交替呼吸途径抑制剂[1 mmol·L-1的水杨基氧肟酸(SHAM) ]预处理的当归幼苗叶片叶绿素含量、Y(Ⅱ)、ETR及qL进一步显著下降,而NPQ进一步显著升高,且温度越低升降幅度越大。研究发现,低温胁迫对当归幼苗叶片叶绿素的合成以及PSⅡ的光化学性能产生了显著抑制,低温胁迫下交替呼吸途径对当归幼苗叶绿素合成以及PSⅡ的光化学性能具有一定的保护作用。
中文关键词:当归幼苗  低温胁迫  交替呼吸途径  光系统Ⅱ
 
Effect of Alternate Respiration Pathway on Chlorophyll Fluorescence Activity of Angelica sinensis Seedlings under Low Temperature Stress
Abstract:We studied the effects of alternate respiration pathway on chlorophyll content and fluorescence characteristics of Angelica sinensis seedlings by pot experiment in greenhouse to explore the role of alternate respiratory pathway in the response of A. sinensis under low temperature (4 ℃ and -7 ℃). It was found that, with the decrease of temperature and the increase of low temperature time, the chlorophyll content, actual photochemical efficiency [Y(Ⅱ)], photosynthetic electron transfer rate (ETR), and photochemical quenching coefficient (qL) of A. sinensis decreased, while the non photochemical quenching coefficient (NPQ) was increased. Meanwhile, low temperature stress also resulted in a significant increase in the alternate respiratory capacity of the A. sinensis seedlings. Under low temperature stress, compared with the A. sinensis seedlings without chemical treatment, the chlorophyll content, Y(Ⅱ), ETR and qL of A. sinensis seedlings pretreated with the inhibitor of the alternate respiratory pathway [1 mmol·L-1 salicylhydroxamic acid (SHAM)] decreased further, but NPQ increased significantly, and the lower the temperature was, the greater the range of rise and fall was. These results indicate that low temperature stress significantly inhibited the chlorophyll synthesis and photochemical properties in the leaves of A. sinensis seedlings, and the alternate respiratory pathway has protective effects on PSⅡ photochemistry and chlorophyll bio synthesis of A. sinensis seedlings under low temperature stress.
keywords:Angelica sinensis seedlings  low temperature stress  alternate respiration pathway  optical systemⅡ
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