PJB-2017-657
BRASSIOSTEROIDS ENHANCE DROUGHT RESISTANCE OF TOMATO SEEDLINGS
SHUMING NIE
Abstract
To examine the role of brassinosteroids and Brassinazole in drought resistance, we investigated the effects of exogenous 24-epibrassinolide (EBR) and/or Brassinazole (Brz) on tomato seedlings under drought stress conditions. Results show that application of EBR effectively alleviated wilting of tomato leaves and significantly mitigated the decrease of relative water content, net photosynthetic rate, maximum quantum efficiency of PSII, coefficient of photochemical quenching, and chlorophyll content caused by drought stress. Additionally, EBR reduced electrolyte leakage, hydrogen peroxide and superoxide. EBR-treated plants also had reduced activity of antioxidant enzymes and enhanced the transcript levels of partial stress-related and antioxidant-related genes. In addition, the application of Brz significantly increased chlorophyll content and stress-related gene transcription. The results of this study support the application of BR to increase drought resistance by regulating expression levels of stress-related and antioxidant-related genes in tomato seedling.
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