The photoprotective role of spermidine in tomato seedlings under salinity-alkalinity stress.
The photoprotective role of spermidine in tomato seedlings under salinity-alkalinity stress.
复制标题
在盐度 - 紫气应激下，精子素在番茄幼苗中的光保护作用。
DOI：
10.1371/journal.pone.0110855
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Hu X
中科院分区：
文献类型：
--
作者：
Hu L;Xiang L;Zhang L;Zhou X;Zou Z;Hu X
多胺是一种小分子的、普遍存在的含氮化合物，它能抑制活性氧，稳定光合机构的结构和功能，以应对非生物胁迫。多胺介导的光保护机制的分子细节尚未完全解决。本研究探讨了亚精胺（Spd）在光合机构结构和功能中的作用。以番茄幼苗为材料，研究了叶面喷施亚精胺（Spd）对盐碱胁迫下番茄幼苗光合和形态参数的影响。盐碱胁迫降低了叶片干重和净光合速率。盐碱胁迫降低了光化学猝灭参数，包括光系统II的最大光化学效率，线性电子通量的量子产率，和光化学猝灭系数（qP）。盐碱胁迫提高了非光化学猝灭参数，包括叶黄素循环的脱环氧化状态和非光化学猝灭（NPQ）。显微镜分析表明，盐碱胁迫破坏了基粒和基质类囊体的内部片层系统。外源亚精胺缓解了胁迫引起的叶片干重、净光合速率和qP参数的下降。亚精胺对盐碱胁迫引起的NPQ参数升高也有一定的缓解作用。在盐碱胁迫下，外源Spd处理的幼苗玉米黄质（Z）含量高于未处理的幼苗。在盐碱胁迫下，外源亚精胺处理的幼苗叶绿体超微结构比不加亚精胺处理的幼苗排列更整齐。这些结果表明外源Spd可以缓解盐碱胁迫引起的生长抑制和类囊体膜光损伤。Spd诱导的Z积累也可能在稳定光合机构中起重要作用。
Polyamines are small, ubiquitous, nitrogenous compounds that scavenge reactive oxygen species and stabilize the structure and function of the photosynthetic apparatus in response to abiotic stresses. Molecular details underlying polyamine-mediated photoprotective mechanisms are not completely resolved. This study investigated the role of spermidine (Spd) in the structure and function of the photosynthetic apparatus. Tomato seedlings were subjected to salinity-alkalinity stress with and without foliar application of Spd, and photosynthetic and morphological parameters were analyzed. Leaf dry weight and net photosynthetic rate were reduced by salinity-alkalinity stress. Salinity-alkalinity stress reduced photochemical quenching parameters, including maximum photochemistry efficiency of photosystem II, quantum yield of linear electron flux, and coefficient of photochemical quenching (qP). Salinity-alkalinity stress elevated nonphotochemical quenching parameters, including the de-epoxidation state of the xanthophyll cycle and nonphotochemical quenching (NPQ). Microscopic analysis revealed that salinity-alkalinity stress disrupted the internal lamellar system of granal and stromal thylakoids. Exogenous Spd alleviated the stress-induced reduction of leaf dry weight, net photosynthetic rate, and qP parameters. The NPQ parameters increased by salinity-alkalinity stress were also alleviated by Spd. Seedlings treated with exogenous Spd had higher zeaxanthin (Z) contents than those without Spd under salinity-alkalinity stress. The chloroplast ultrastructure had a more ordered arrangement in seedlings treated with exogenous Spd than in those without Spd under salinity-alkalinity stress. These results indicate that exogenous Spd can alleviate the growth inhibition and thylakoid membrane photodamage caused by salinity-alkalinity stress. The Spd-induced accumulation of Z also may have an important role in stabilizing the photosynthetic apparatus.
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