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《Chinese Journal of Plant Ecology》 2015-12
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Exogenous polyamines alleviating salt stress on peanuts(Arachis hypogaea) grown in pots

MENG De-Yun;HOU Lin-Lin;YANG Sha;MENG Jing-Jing;GUO Feng;LI Xin-Guo;WAN Shu-Bo;School of Life Science of Shandong University;Biotechnology Research Center,Shandong Academy of Agricultural Sciences;Shandong Provincial Key Laboratory of Crop Genetic Improvement,Ecology and Physiology;College of Agronomy and Plant Protection,Qingdao Agricultural University;  
Aims Soil salinity is a major limiting factor for plant establishment, development and productivity. In recent years, the contradiction between oil crops and food crops for land is increasingly prominent. In order not to take up the land for food, peanut planting on saline-alkali land could be a promising option. However, peanuts have been rarely grown in saline-alkali land, which may be due to the reduction of peanut yield caused by salt stress. Therefore, research of peanut salt resistance has important practical significance. Methods In order to investigate the effects of exogenous polyamines on peanut(Arachis hypogaea) grown in pots under salt stress, ‘Huayu 22', one of the peanut cultivars, was used as materials by being foliar-sprayed with 1 mmol·L~(–1) putrescine(Put), 1 mmol·L~(–1) spermidine(Spd) and 1 mmol·L~(–1) spermine(Spm) to elucidate the role of exogenous polyamines on peanuts under 150 mmol·L~(–1) Na Cl. Important findings Results showed that growth, yield, chlorophyll contents and antioxidant enzyme activities of peanut seedling decreased, however, malondialdehyde(MDA) content and relative electrolytic leakage increased under salt stress. Meanwhile, exogenous polyamines significantly improved the activities of superoxide dismutase(SOD), peroxidase(POD) and catalase(CAT), and reduced the relative electrolytic leakage and MDA content in peanut leaves under salt stress and thus alleviating the oxidative damage of salt stress on plasma membrane. It is obvious that exogenous polyamines could improve chlorophyll contents, plant height, number of branch and the amount of dry matter accumulation, even pod yield under salt stress. Among these three polyamines, the effects of exogenous Spm on alleviating salt stress were most effective These results showed that exogenous polyamines, especially Spm, were favorable for the seedlings toincrease reactive oxygen metabolism and photosynthesis, which improved peanut growth and reduced the inhibitory effects of salt stress on peanuts.
【Fund】: 国家自然科学基金(31571581和31571605);; 国家科技支撑计划(2014BAD11B04);; 山东省农业重大应用技术创新课题;; 山东省自主创新成果转化重大专项(2012ZHZXIA0418);; 山东省自然科学基金项目(ZR2011CQ042和ZR2015YL077);; 山东省农业科学院科技创新重点项目(2014CXZ06-6);山东省农业科学院青年科研基金(2015YQN02);; 现代农业产业技术体系建设专项资金资助(CARS-14)
【CateGory Index】: S565.2
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