Department of Plant Eco-physiology, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.
Soil and Water Research Department, East Azerbaijan Agricultural and Natural Resources Research and Education Center, AREEO, Tabriz, Iran.
Protoplasma. 2020 Jul;257(4):1035-1047. doi: 10.1007/s00709-020-01493-1. Epub 2020 Feb 25.
Salinity is a major environmental stress that limits plant production and portraits a critical challenge to food security in the world. In this research, the impacts of plant growth-promoting bacteria (Pseudomonas RS-198 and Azospirillum brasilense RS-SP7) and foliar application of plant hormones (salicylic acid 1 mM and jasmonic acid 0.5 mM) on alleviating the harmful effects of salt stress in rapeseed plants (Brassica napus cv. okapi) were examined under greenhouse condition. Salt stress diminished rapeseed biomass, leaf area, water content, nitrogen, phosphorus, potassium, calcium, magnesium, and chlorophyll content, while it increased sodium content, endogenous salicylic and jasmonic acids, osmolyte production, HO and O generations, TBARS content, and antioxidant enzyme activities. Plant growth, nutrient content, leaf expansion, osmolyte production, and antioxidant enzyme activities were increased, but oxidative and osmotic stress indicators were decreased by bacteria inoculation + salicylic acid under salt stress. Antioxidant enzyme activities were amplified by jasmonic acid treatments under salt stress, although rapeseed growth was not generally affected by jasmonic acid. Bacterial + hormonal treatments were superior to individual treatments in reducing detrimental effects of salt stress. The best treatment in rectifying rapeseed growth under salt stress was combination of Pseudomonas and salicylic acid. This combination attenuated destructive salinity properties and subsequently amended rapeseed growth via enhancing endogenous salicylic acid content and some essential nutrients such as potassium, phosphorus, and magnesium.
盐度是限制植物生产的主要环境胁迫因素，也是全球粮食安全面临的关键挑战。在这项研究中，在温室条件下，研究了植物生长促进细菌（假单胞菌 RS-198 和固氮菌 RS-SP7）和叶面喷施植物激素（1mM 水杨酸和 0.5mM 茉莉酸）对缓解油菜（甘蓝型 okapi 油菜）植物盐胁迫有害影响的作用。盐胁迫降低了油菜生物量、叶面积、含水量、氮、磷、钾、钙、镁和叶绿素含量，而增加了钠含量、内源性水杨酸和茉莉酸、渗透调节剂的产生、HO 和 O 生成、TBARS 含量和抗氧化酶活性。在盐胁迫下，接种细菌+水杨酸增加了植物生长、养分含量、叶片扩张、渗透调节剂的产生和抗氧化酶活性，但降低了氧化和渗透胁迫指标。在盐胁迫下，茉莉酸处理放大了抗氧化酶的活性，尽管茉莉酸通常不会影响油菜的生长。细菌+激素处理在减轻盐胁迫的有害影响方面优于单独处理。在盐胁迫下纠正油菜生长的最佳处理是假单胞菌和水杨酸的组合。这种组合通过增强内源性水杨酸含量和一些必需营养物质（如钾、磷和镁）来减轻破坏性盐度特性，并随后改善油菜的生长。
