Far-red light interacts with salinity stress in Cucumis sativus seedlings partly through changes in photosynthate allocation
Far-red light interacts with salinity stress in Cucumis sativus seedlings partly through changes in photosynthate allocation
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DOI：
10.1007/s10725-023-00978-2
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发表时间：
2023-02
影响因子：
4.2
通讯作者：
T. Shibuya;Ayano Nagata;R. Endo
中科院分区：
文献类型：
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作者：
T. Shibuya;Ayano Nagata;R. Endo
盐度通过减少光合作用和叶片扩张来抑制植物生长。盐度胁迫下抑制植物生长的主要因素在不同的研究中有所不同。在本研究中，我们重点研究了远红光（FR）作为与盐度相互作用的一个因素。研究了盐度对含FR （FR+）光和无FR （FR -）光下黄瓜幼苗生长分析参数的影响。FR和盐度的相互作用影响了植物的生长，FR−胁迫下的生长抑制小于FR+胁迫下的生长抑制。生长分析表明，盐胁迫下植物生长的主要限制因子是FR+下的净同化率（NAR）， FR -下的叶面积比（LAR）。在FR -条件下，nara不受盐度的影响而显著降低，这可能是因为活性光敏色素比例的增加提高了渗透胁迫的耐受性。另一方面，只有在FR -作用下，盐度才会降低larp。这可能是因为盐度并没有增加光合作用分配给叶片，这可能弥补了盐度造成的比叶面积的减少，因为在FR -条件下，光合作用分配给茎的数量受到限制。我们的结果表明，在研究盐胁迫下导致生长抑制的因素时，应考虑光源中FR的比例，这可能影响胁迫耐受性和光合作用分配。
Salinity inhibits plant growth by reducing photosynthesis and leaf expansion. The main factor that inhibits plant growth under salinity stress differs among studies. In the present study, we focused on far-red light (FR) as a factor that interacts with salinity. We investigated the effects of salinity on growth analysis parameters ofCucumis sativusseedlings under light containing FR (FR+) or light without FR (FR–). Interactions between FR and salinity influenced plant growth: the growth inhibition under salinity stress was smaller under FR − than under FR+. Growth analysis showed that the main limiting factor for plant growth under salinity stress was the net assimilation rate (NAR) under FR+, but was the leaf area ratio (LAR) under FR–.NARwas not significantly decreased by salinity under FR–, probably because of improved tolerance of osmotic stress due to an increased proportion of active phytochrome. On the other hand,LARwas decreased by salinity only under FR–. This is probably because salinity did not increase the photosynthate allocation to leaves, which could have compensated for the decreased specific leaf area caused by salinity, because photosynthate allocation to the stem was limited under FR–. Our results indicate that the proportion of FR in light sources, which probably affects stress tolerance and the photosynthate allocation, should be considered when investigating the factors that cause growth inhibition under salinity stress.