Soybean DN42 was sprayed by epi BL to study the effect of BR on GmRAV expression by real-time quantative PCR.Meantime,T5 generation GmRAVox tobaccos were treated with epi BL to study if GmRAV was involved in BR signaling to inhibit the plant growth and development.The results showed that the GmRAV mRNA expression level was inhibited by BR,and the exogenous epi BL addition did not promote GmRAVox tobacco stem elongation,which indicated that GmRAV might be a negative regulator in BR signaling pathway.Furtherm...