Photosynthetic rate, Chlorophyll content and specifie leaf weight increased,but relative electric conductivity of kernel of ear tip declined by spraying BR, (that is, the activity of kernel increased).

• 喷施BR以后,玉植株光合作用增强、比叶重和叶绿素含量增高,而果穗顶端籽粒的相对电导率下降(即籽粒活性增强)。