Genotypic variations in ion homeostasis, photochemical efficiency and antioxidant capacity adjustment to salinity in cotton (Gossypium hirsutum L.)

文献类型： 外文期刊

第一作者： Ning Wang

作者： Ning Wang;Haikun Qi;Guilan Su;Jie Yang;Hong Zhou;Qinghua Xu;Qun Huang;Gentu Yan

作者机构：

关键词： cotton;salt tolerance;photochemical efficiency;ion flux;antioxidant enzymes

期刊名称：SOIL SCIENCE AND PLANT NUTRITION （ 影响因子：2.389； 五年影响因子：2.525 ）

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收录情况： SCI

摘要： To determine the genotypic variation in response to salt (NaCl) stress in cotton (Gossypium hirsutum L.) seedlings, potassium (K+) and sodium (Na+) homeostasis, photochemical energy utility, reactive oxygen metabolism and the activity of antioxidant enzymes were comparatively analyzed in three cotton cultivars (CCRI 49, CCRI 35 and Z 51504) under salt constraint. The results showed that NaCl treatment significantly inhibited biomass accumulation, and the extent of inhibition was highest in CCRI 49 and lowest in Z 51504. Salinity caused an ion imbalance in plants but ion homeostasis was less pronounced in Z 51504, as it accumulated more K+ and less Na+. Experiments of salt shock treatment were tested using a non-invasive micro-test (NMT) system, which also revealed that Z 51504 had lower Na+ influx and better K+ retention. Salinity increased excess-energy dissipation [non-photochemical quenching (qN) and photorespiration rate (PR)], but depressed photochemical efficiency such as photosynthesis rate (P-n), quenching (qP), photochemical quantum yield of photosystem (phi(PSII)) and electron transport rate (ETR). As a result, more electrons were driven to other sinks, for example decreasing ETR/P-n and increasing the O-2(-) generation rate. However, the superior tolerance of Z 51504 had a better balance of photochemical energy under salt conditions, displayed higher photochemical efficiency and excess-energy dissipation. Furthermore, the antioxidant enzyme activities were also affected by salt stress and less effectively removed reactive oxygen species. The antioxidant enzyme activities of Z 51504 were higher than those of CCRI 49 and CCRI 35, which resulted in lower levels of reactive oxygen species (ROS) and mitigated the salt-induced membrane lipid peroxidation. The overall results indicated that more effective retention of ions, photochemical energy utility and ROS-removing capability were probably the main reasons for the stronger salt tolerance in Z 51504.

分类号： S15

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