光热胁迫下光合铁氧化还原酶的氧化还原状态

IF 0.8 4区 化学 Q4 SPECTROSCOPY Journal of Applied Spectroscopy Pub Date : 2024-05-13 DOI:10.1007/s10812-024-01726-8
N. L. Pshybytko
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引用次数: 0

摘要

利用差分吸收光度法研究了大麦幼苗在高强度光照(2000 μmol∙quanta∙m-2-s-1,30 分钟)和高温(40°C,3 小时)条件下第一片叶子中光合系统 1(PS1)主要供体 P700、质花青素(PC)和铁氧还蛋白(Fd)的氧化/还原动力学。暴露在高强度光下会增加 PS1 反应中心 P700+、氧化 PC 和还原 Fd 的氧化形式的积累。在红光和远红光照射的相同条件下,还原型 Fd 没有被再氧化。暴露在高温下的大麦幼苗中,P700+、PC+ 和 Fd - 的积累增加。此外,在红光照射下,叶片 Fd 的再氧化速度加快。氧化的 Fd 在远红光下没有积累。由此得出结论,在光胁迫下,通过 Fd 的不依赖于光的电子流被激活,而在热胁迫下,涉及质醌池的替代电子流被激活。
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Redox State of Photosynthetic Ferredoxin Under Heat and Light Stress

The kinetics of oxidation/reduction of the primary donor of photosystem 1 (PS1) P700, plastocyanin (PC), and ferredoxin (Fd) in the first leaves of barley seedlings under exposure to high-intensity light (2000 μmol∙quanta∙m–2·s–1, 30 min) and elevated temperature (40°C, 3 h) were studied using differential absorption photometry. Exposure to high-intensity light increased the accumulation of the oxidized form of PS1 reaction center P700+, oxidized PC, and reduced Fd. Reduced Fd was not reoxidized under the same conditions on exposure to red and far-red light. The accumulation of P700+, PC+, and Fd increased in barley seedlings exposed to elevated temperatures. Also, reoxidation of leaf Fd accelerated under red light. Oxidized Fd did not accumulate under far-red light. It was concluded that photo-independent electron flow through Fd under light stress and alternative electron flows involving the plastoquinone pool under heat stress were activated.

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来源期刊
CiteScore
1.30
自引率
14.30%
发文量
145
审稿时长
2.5 months
期刊介绍: Journal of Applied Spectroscopy reports on many key applications of spectroscopy in chemistry, physics, metallurgy, and biology. An increasing number of papers focus on the theory of lasers, as well as the tremendous potential for the practical applications of lasers in numerous fields and industries.
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