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生态学杂志 ›› 2023, Vol. 42 ›› Issue (5): 1083-1089.doi: 10.13292/j.1000-4890.202304.029

• 研究报告 • 上一篇    下一篇

外源植物激素对小白菜硒、镉富集及生理特性的影响

陈锦平,黄太庆,邢颖,曾成城,廖青,潘丽萍,梁潘霞,刘永贤*   

  1. (广西壮族自治区农业科学院农业资源与环境研究所, 广西富硒农业研究中心, 广西富硒农产品工程技术研究中心, 南宁 530007)

  • 出版日期:2023-05-10 发布日期:2023-05-05

Effects of exogenous plant hormones on the accumulation of selenium and cadmium and physiological attributes of pak choi (Brassica chinensis L.).

CHEN Jinping, HUANG Taiqing, XING Ying, ZENG Chengcheng, LIAO Qing, PAN Liping, LIANG Panxia, LIU Yongxian*   

  1. (Agricultural Resources and Environment Research Institute, Guangxi Academy of Agricultural Sciences, Guangxi Selenium-rich Agricultural Research Center, Guangxi Selenium-rich Agricultural Products Engineering Technology Research Center, Nanning 530007, China).

  • Online:2023-05-10 Published:2023-05-05

摘要: 增强作物对土壤硒的富集能力对于提高土壤硒的利用效率,优化富硒作物的生产具有重要意义。采用盆栽方法,设置对照组(CK)、50 μmol·L-1茉莉酸(JA50)、100 μmol·L-1茉莉酸(JA100)、50 μmol·L-1水杨酸(SA50)、100 μmol·L-1水杨酸(SA100)等处理组,分析不同处理小白菜硒含量、镉含量、生物量、叶绿素荧光参数、丙二醛含量和抗氧化酶活性的变化,探究外源植物激素在增强小白菜硒富集能力上的应用潜力。结果表明:与CK相比,激素处理组小白菜地上部硒含量提高54.7%~229.1%,根部硒含量提高175.0%~276.8%,同时茉莉酸处理组地上部硒含量和硒积累量显著高于水杨酸处理组;与CK相比,植物激素处理显著降低小白菜地上部镉含量26.3%~63.2%、镉积累量38.5%~72.1%,且茉莉酸处理组地上部镉含量和镉积累量明显低于水杨酸处理组;此外,激素处理组的Fv′/Fm′、ΦPSⅡqP均显著下降,NPQ均显著升高,PSⅡ活性受到明显抑制;激素处理显著提高小白菜叶片MDA含量,引起严重的脂质过氧化;综上,叶面喷施50和100 μmol·L-1两种浓度的茉莉酸或水杨酸均能有效增强小白菜对土壤硒的富集能力,同时降低镉在地上部的积累,且茉莉酸的改善作用优于水杨酸。


关键词: 外源茉莉酸, 外源水杨酸, 硒积累, 叶绿素荧光

Abstract: Enhancing the enrichment capacity of selenium (Se) in crops is of great significance to improve soil Se utilization efficiency and optimize the production of Se-enriched crops. We conducted a pot experiment to examine the role of exogenous plant hormones (jasmonic acid, JA; salicylic acid, SA) in enhancing Se enrichment capacity of pak choi (Brassica chinensis L.). There were five treatments: control (CK), 50 μmol·L-1 JA (JA50), 100 μmol·L-1 JA (JA100), 50 μmol·L-1 SA (SA50), and 100 μmol·L-1 SA (SA100). We measured Se content, cadmium (Cd) content, biomass, chlorophyll fluorescence, MDA content, and antioxidant enzymatic activities of pak choi after harvest. We found that shoot Se content and root Se content under plant hormone treatments increased by 54.7%-229.1% and 175.0%-276.8% relative to CK, respectively, and that shoot Se content and accumulation were significantly higher in JA treatment groups than that in SA treatment groups. The shoot Cd content and accumulation under plant hormone treatments decreased by 26.3%-63.2% and 38.5%-72.1% relative to CK, respectively. Shoot Cd content and accumulation of the JA treatment groups were much lower than that of the SA treatment groups. With regard to fluorescence, Fv′/Fm′, ΦPSII, and qwere significantly lower, whereas NPQ was significantly higher in plant hormone treatments compared with that in CK, indicating that plant hormone treatments significantly decreased the activity of PSII. Plant hormone treatments significantly increased leaf MDA content, causing heavy lipid peroxidation. In summary, foliar spraying of 50 or 100 μmol·L-1 JA or SA can effectively enhance the enrichment capacity of pak choi to soil Se and reduce shoot Cd accumulation. These ameliorative effects of JA are greater than that of SA.


Key words: exogenous jasmonic acid, exogenous salicylic acid, selenium accumulation, chlorophyll fluorescence.