热带亚热带雨林树种秀丽隐杆线虫的耐热性：生理热稳定性和生物化学的时间依赖性动态响应。

IF 8.3 1区生物学 Q1 PLANT SCIENCES

New Phytologist Pub Date : 2023-11-06 DOI:10.1111/nph.19356

Lingling Zhu, Andrew P. Scafaro, Elizabeth Vierling, Marilyn C. Ball, Bradley C. Posch, Frederike Stock, Owen K. Atkin

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引用次数: 0

摘要

热胁迫中断了生理热稳定性，并引发了对植物生存至关重要的生化反应。然而，关于植物在数小时和数天内适应高温的速度，以及哪些调整至关重要，目前还知之甚少。热带亚热带雨林树种（秀丽隐杆线虫）在40°C下加热5 d、在恢复到25°C之前13 恢复日期。使用最小叶绿素a荧光急剧上升的温度（Tcrit）来量化叶片的耐热性。Tcrit、代谢产物、热休克蛋白（HSP）丰度和膜脂脂肪酸（FA）组成进行定量。Tcrit在2内增加了4°C（48-52°C） 40°C暴露h，同时代谢产物和HSP快速积累。相比之下，它花了> 2. d使FA成分发生变化。至少2 Tcrit、HSP90、HSP70和FA需要d才能恢复到预应力水平。研究结果强调了秀丽隐杆线虫对热应激的多方面反应，以及这种反应如何在数小时到数天的范围内变化，最终导致光合耐热性水平的提高。在持续的全球气候变化中，当面临热浪时，这些反应对植物的生存至关重要。

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Heat tolerance of a tropical–subtropical rainforest tree species Polyscias elegans: time-dependent dynamic responses of physiological thermostability and biochemistry

Heat stress interrupts physiological thermostability and triggers biochemical responses that are essential for plant survival. However, there is limited knowledge on the speed plants adjust to heat in hours and days, and which adjustments are crucial.
Tropical–subtropical rainforest tree species (Polyscias elegans) were heated at 40°C for 5 d, before returning to 25°C for 13 d of recovery. Leaf heat tolerance was quantified using the temperature at which minimal chl a fluorescence sharply rose (T_crit). T_crit, metabolites, heat shock protein (HSP) abundance and membrane lipid fatty acid (FA) composition were quantified.
T_crit increased by 4°C (48–52°C) within 2 h of 40°C exposure, along with rapid accumulation of metabolites and HSPs. By contrast, it took > 2 d for FA composition to change. At least 2 d were required for T_crit, HSP90, HSP70 and FAs to return to prestress levels.
The results highlight the multi-faceted response of P. elegans to heat stress, and how this response varies over the scale of hours to days, culminating in an increased level of photosynthetic heat tolerance. These responses are important for survival of plants when confronted with heat waves amidst ongoing global climate change.

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来源期刊

New Phytologist 生物-植物科学

自引率

5.30%

发文量

728

期刊介绍： New Phytologist is an international electronic journal published 24 times a year. It is owned by the New Phytologist Foundation, a non-profit-making charitable organization dedicated to promoting plant science. The journal publishes excellent, novel, rigorous, and timely research and scholarship in plant science and its applications. The articles cover topics in five sections: Physiology & Development, Environment, Interaction, Evolution, and Transformative Plant Biotechnology. These sections encompass intracellular processes, global environmental change, and encourage cross-disciplinary approaches. The journal recognizes the use of techniques from molecular and cell biology, functional genomics, modeling, and system-based approaches in plant science. Abstracting and Indexing Information for New Phytologist includes Academic Search, AgBiotech News & Information, Agroforestry Abstracts, Biochemistry & Biophysics Citation Index, Botanical Pesticides, CAB Abstracts®, Environment Index, Global Health, and Plant Breeding Abstracts, and others.