Effects of BR on seed germination and seedling antioxidant capacity in watermelon under low temperature stress
HOU Shengcan
ZHAO Zhan
ZHANG Lifeng
WANG Jiafa
LUO Xiaodan
YU Yuhong
LIU Hongbing
WANG Zhongyuan
ZHAO Jinhe
LI Junhua
Abstract：In order to investigate the regulatory mechanism of exogenous brassinolide(BR)on watermelon seed germina-tion and the low temperature tolerance of seedlings,the watermelon seed variety B6 was used as the experimental materi-al.The effects of seed soaking with different concentrations of BR(0.001,0.01,0.05,0.1,1,and 5 mg·L-1)on seed germi-nation and seedling growth characteristics under low temperature stress were studied.The results indicated that under low temperature stress,the 0.05 mg·L-1BR treatment yielded the most favorable outcomes:The germination rate was signifi-cantly increased 29.28 percent points compared with the control(distilled water).The activities of SOD,POD,and CAT in the seedlings were significantly enhanced by 77.55％,72.90％,and 54.74％,respectively.Meanwhile,the contents of soluble protein,soluble sugar,and proline were markedly elevated by 167.43％,63.07％,and 66.42％,respectively.In con-trast,the levels of REC,MDA,O2-·,and H2O2 were significantly reduced by 40.96％,50.00％,42.37％,and 40.41％,re-spectively.These findings provide valuable theoretical support for improving watermelon seed germination and enhancing seedling low temperature resistance under cold stress conditions.
Keywords：WatermelonBrassinolideLow temperature stressSeed germinationPhysiological characteristics
Publication Date：2025-10-05
Online Publishing Date：2025-11-05(First online date of this platform, not the publication date of the document)
Pages：6( 98-103 )