Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (10): 1789-1796.DOI: 10.3969/j.issn.1004-1524.2021.10.01

Previous Articles     Next Articles

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

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

CLC Number: