气孔导度
叶绿素
蒸腾作用
叶绿素荧光
过氧化物酶
脯氨酸
黄瓜
APX公司
开枪
脱落酸
过氧化氢酶
植物生理学
超氧化物歧化酶
非生物胁迫
盐度
生物
水培
苗木
丙二醛
耐旱性
植物
作者
Yanxiu Miao,Xiyan Luo,Gao Xingxing,Wenjiao Wang,Li Bin,Leiping Hou
标识
DOI:10.1016/j.scienta.2020.109577
摘要
Abstract Exogenous salicylic acid (SA) can alleviate salt stress in plants. Previous researches have been focused on SA’s role in leaf morphological and physiological characteristics, however, little information is available on its role in both leaf photosynthesis and root system architecture (RSA). A hydroponic study was conducted to analyze biomass, leaf photosynthesis, RSA parameters and expression of RSA genes in cucumber seedlings grown under four treatments, including control (CK), 50 mM NaCl (NaCl), 0.3 mM SA (SA) and 50 mM NaCl plus 0.3 mM SA (NaCl + SA). The results showed that compared with CK, both NaCl and SA treatments severely reduced relative growth rate (RGR) and leaf photosynthetic parameters (Fv/Fm, ΦII and Pn). However, compared with NaCl treatment, NaCl + SA treatment significantly increased RGR, leaf photosynthetic (Fv/Fm, ΦII and Pn) and RSA (total root length, root surface area, number and total length of primary and secondary LR) parameters. In addition, compared with CK, although both NaCl and SA treatments down-regulated expression of GL2 gene and up-regulated expression of RHD2 gene, NaCl + SA treatment notably up-regulated expression of NAC1, NAC2, GL2, EXP and down-regulated expression of RHD2. It is concluded that exogenous SA alleviated salt stress via effectively promoting leaf photosynthesis and RSA in cucumber seedlings. SA-mediated increment in expression of RSA genes, total length and number of primary and secondary LR could contribute to the improved RSA.
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