The concentrations of 300 mg/L and 400 mg/L ethephon reduced the contents of chl a,chl b and carotenoid, and the activity of malic enzyme, and the decreases were greater with the concentrations of ethephon applied in the treatment.

• 300mg/L，400mg/L则降低了甘蔗叶片叶绿素a、叶绿素b及类胡萝卜素的含量，对NADP－苹果酸酶活性也有明显的抑制作用，且浓度越大，抑制作用越强。