浙江农业学报 ›› 2021, Vol. 33 ›› Issue (10): 1789-1796.DOI: 10.3969/j.issn.1004-1524.2021.10.01

• 作物科学 • 上一篇    下一篇

外源水杨酸对水稻苗期生长与防卫相关基因表达的影响

刘寒1,2(), 戴远兴1,2, 吕明芳2, 袁正杰2, 李静2, 严成其2, 张恒木2,*()   

  1. 1.浙江师范大学 化学与生命科学学院,浙江 金华 321004
    2.浙江省农业科学院 病毒学与生物技术研究所,浙江 杭州 310021
  • 收稿日期:2021-04-15 出版日期:2021-10-25 发布日期:2021-11-02
  • 通讯作者: 张恒木
  • 作者简介:张恒木,E-mail: zhhengmu@tsinghua.org.cn
    刘寒(1994—),女,河南新乡人,硕士研究生,主要从事植物病理学研究。E-mail: 2916120823@qq.com
  • 基金资助:
    浙江省重点研发计划(2019C02018)

Effects of exogenous salicylic acid on growth and defense-related genes of rice seedlings

LIU Han1,2(), DAI Yuanxing1,2, LYU Mingfang2, YUAN Zhengjie2, LI Jing2, YAN Chengqi2, ZHANG Hengmu2,*()   

  1. 1. College of Chemistry and Life Science, Zhejiang Normal University, Jinhua 321004, China
    2. Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
  • Received:2021-04-15 Online:2021-10-25 Published:2021-11-02
  • Contact: ZHANG Hengmu

摘要:

为探究外源水杨酸(SA)对水稻苗期生长与SA相关防卫反应的影响,用不同浓度外源SA喷施苗期日本晴水稻,利用分光光度计测定水稻苗期生长关键指标叶绿素含量,采用qRT-PCR定量分析外源SA对水稻苗期SA合成基因PAL1、SA受体基因NPR1、SA信号途径下游的转录因子WRKY45/WRKY76和防卫基因PR1a/PR1b的表达水平。结果表明,外源SA对上述水稻基因的影响不同,即低浓度SA在一定程度上促进水稻苗期叶绿素积累,并显著影响水稻苗期防卫相关基因的表达水平;高浓度SA抑制叶绿素的积累,影响水稻的正常生长。综合比较结果显示,喷施2.0 mmol·L-1外源SA对水稻苗期防卫相关基因表达的影响最为有效,该结果为进一步探索外源SA促进水稻苗期生长并提高水稻苗期防卫能力的作用研究奠定基础。

关键词: 水稻, 水杨酸, 防卫相关基因, 叶绿素

Abstract:

To explore the effects of exogenous salicylic acid (SA) on plant growth and SA-related defense responses at the stage of rice seedlings, gradient concentrations of exogenous SA were used to spray rice seedlings of Nipponbare. Spectrophotometer was applied to measure the content of chlorophyll, a key indicator of rice seedling growth, and qRT-PCR was further used to analyze the expression levels of SA-biosynthesis gene PAL1, SA-receptor gene NPR1, and transcription factors WRKY45/WRKY76 and defense genes PR1a/PR1b at the downstream of SA signal pathway. It was found that different concentrations of exogenous SA exerted varying influences on expression patterns of tested genes, i.e. lower concentrations of exogenous SA promoted chlorophyll accumulation a certain extent and markedly affected on the expression of defense-related genes, while high concentrations of SA inhibited the accumulation of chlorophyll and induced abnormal growth at the stage of rice seedlings. Comprehensive comparison of quantitative results suggested that 2.0 mmol·L -1 of SA could be most effective in inducing the expression of defense-related genes by spraying rice seedlings. These results laid the foundation for further investigating roles of exogenous SA in promotion of plant growth and defense responses at the stage of rice seedlings.

Key words: rice, salicylic acid (SA), defense-related genes, chlorophyll

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