The stronger the light intensity was, the higher the net photosynthetic rate in leaves and the flavone content in stem-leaves were in squaring, blooming and bearing and mature stages.

• [结果] 苦荞遮光后较短时间内，叶片叶绿素指数随光强的增加而降低，遮光后较长时间内，叶片叶绿素指数随光强的减弱而减弱；