外源钙缓解钠盐诱导小麦幼苗光合特性变化对植物毒性的影响

IF 2.1 4区生物学 Q2 PLANT SCIENCES

Photosynthetica Pub Date : 2023-11-06 DOI:10.32615/ps.2023.039

Y. ZHANG, G.M. LIU, Z.F. WANG, A.M. ZHANG, Y.L. YANG

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引用次数: 0

摘要

为评价小麦(Triticum aestivum L.)西寒3号(Triticum aestivum L.)幼苗在150 mM NaCl、CaCl2(0.1、0.5和1 mM)、Ca2+通道阻滞剂LaCl3和/或Ca2+螯合剂乙二醇四乙酸(EGTA)单独或联合处理下对钠盐诱导的植物毒性的缓解作用，研究幼苗的生长和光合特性。单独NaCl (150 mM)处理抑制了小麦幼苗的生长，降低了光合效率和叶绿素荧光参数，降低了光合色素、Ca2+和钙调素(CaM)含量，下调了叶片中TaCaM的表达。单独处理0.5 mM或1 mM CaCl2会引起这些参数相反的变化。此外，0.5或1 mM CaCl2可有效缓解钠盐引起的这些参数的变化，而这些变化被LaCl3或EGTA阻断。因此，外源Ca的存在通过Ca- cam信号介导的光合作用和Chl合成的增强，有效促进了nacl胁迫下小麦幼苗的生长。

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Exogenous calcium-alleviating effect on sodium salt-induced phytotoxicity associated with changes in photosynthetic characteristics of wheat seedlings

To evaluate the Ca-alleviating effect on sodium salt-induced phytotoxicity, wheat (Triticum aestivum L.) cultivar Xihan 3 seedlings were treated with 150 mM NaCl, CaCl2 (0.1, 0.5, and 1 mM), Ca2+-channel blocker LaCl3, and/or Ca2+ chelator, ethylene glycol tetraacetic acid (EGTA) alone or in combination, to investigate seedling growth and photosynthetic characteristics. NaCl (150 mM) exposure alone suppressed a growth of seedling, weakened photosynthetic efficiency and chlorophyll (Chl) fluorescence parameters, reduced photosynthetic pigments, Ca2+ and calmodulin (CaM) contents, and downregulated TaCaM expression in wheat leaves. The opposite changes of these parameters were caused by 0.5 or 1 mM CaCl2 treatments alone. Moreover, 0.5 or 1 mM CaCl2 application effectively alleviated sodium salt-induced changes of these parameters, which was blocked by LaCl3 or EGTA. Therefore, exogenous Ca presence effectively promoted the growth of NaCl-stressed wheat seedlings through the enhancement of photosynthesis and Chl synthesis mediated by the Ca-CaM signal.

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来源期刊

Photosynthetica 生物-植物科学

CiteScore

5.60

自引率

7.40%

发文量

审稿时长

3.8 months

期刊介绍： Photosynthetica publishes original scientific papers and brief communications, reviews on specialized topics, book reviews and announcements and reports covering wide range of photosynthesis research or research including photosynthetic parameters of both experimental and theoretical nature and dealing with physiology, biophysics, biochemistry, molecular biology on one side and leaf optics, stress physiology and ecology of photosynthesis on the other side. The language of journal is English (British or American). Papers should not be published or under consideration for publication elsewhere.