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中国油料作物学报 ›› 2019, Vol. 41 ›› Issue (6): 904-.doi: 10.19802/j.issn.1007-9084.2019057

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Epibrassinolide regulation on oilseed rape (Brassica napus L.) in different period

  

  1. 1. College of Agronomy, Hunan Agricultural University / National Oilseed Crops Improvement Center in Hunan,
    Changsha 410128, China;
     2. College of Biological and Agricultural, Zunyi Normal University, Zunyi 563002, China
  • Online:2019-12-28 Published:2019-12-20

Abstract:

To understand the effect of brassinolide on quality and dim light reaction of Brassica napus L., 2 ir? radiated mutants (XY881 and XY883) of B. napus cv Xiangyou 15 were investigated to study the effects of epibrassi? nolide (2,4-BL) on seed germination, vegetative growth, oil production and related components by pot experiment and field trials from 2014 to 2016. Results showed that 2,4-BL had the same effects on both lines. 2,4-BL had dose effect on seed germination. Low concentration promoted seed germination. Low 2,4-BL promoted elongation of main stem, increased photosynthetic efficiency, and promoted fruiting without affecting seed size and seed oil. Using 2,4- BL after flowering delayed seeds ripen and led to lower oil content. Regulation of 2,4-BL decreased in the case of long-term continuous use. Gene expression data showed that 2,4-BL induced (BnaPIF4, BnaBZR1 and BnaBES) gene expression of the key transcription factors in brassinosteroid signalling pathway and the light signalling path? way. It suggested that 2,4-BL activated downstream regulatory gene network to promote vegetative growth and si? lique growth by promoting photosynthesis. Thus 2,4-BL could be used as growth regulator in rapeseed production, but be applied at low concentration or long intervals, with the best result before the full flowering stage.

Key words: brassinolide, Brassica napus L., photosynthesis, oil production of rapeseed, gene expression