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Acta Horticulturae Sinica ›› 2022, Vol. 49 ›› Issue (2): 319-331.doi: 10.16420/j.issn.0513-353x.2021-0025

• Research Papers • Previous Articles     Next Articles

The Jasmonic Acid Synthesis Gene LoxD Participates in the Regulation of Tomato Drought Resistance

PENG Yi, LI Yuanhui, YANG Rui, ZHANG Ziyi, LI Yanan, HAN Yunhao, ZHAO Wenchao(), WANG Shaohui()   

  1. Beijing Key Laboratory for Agriculture Application and New Technique,College of Plant Science and Technology,Beijing University of Agriculture,Beijing 102206,China
  • Received:2021-03-15 Revised:2021-04-19 Online:2022-02-25 Published:2022-02-28
  • Contact: ZHAO Wenchao,WANG Shaohui E-mail:zwcxy1985@163.com;wangshaohui@bua.edu.cn

Abstract:

To study the drought resistance mechanism regulated by JA,using tomato variety‘Castlemart’jasmonic acid synthesis gene LoxD-overexpression transgenic plants(LoxD-oe)and LoxD mutant(spr8)and their corresponding wild type(WT)as material. Under the drought stress,the relative water content,soluble sugar,malondialdehyde content,stomatal aperture,H2O2 level in guard cells,and the expressions of the ABA signaling and related ion channel genes were determined. It was found that LoxD gene was induced by drought stress. The overexpression of LoxD gene gave rise to the increases of the relative water content and soluble sugar content and the decline of MDA production in leaves. Moreover,under drought stress,overexpressing LoxD gene induced the expressions of SnRK2-like,SLAC1,AtrbohD and CPK1,inhibited the expressions of ABI2 and KAT1,and activated the H2O2 signal in guard cells,which probably arrested the stomatal opening and then reduced the water loss. The results showed that LoxD gene participates in regulating drought resistance.

Key words: tomato, jasmonic acid, drought stress, LoxD gene, stomatal movement, H2O2 fluorescence signal

CLC Number: