关于疏除剂作用机制的研究,一直落后于疏除效果的应用研究。人们经常问起某种疏除剂对有的品种起疏果作用,但对另一些品种就不起作用以及疏除剂的疏除机制是什么等问题。近年来针对有关疏除剂的作用机制已进行了大量的研究工作。用0.25%的二硝邻甲酚喷到苹果花的柱头上时,花粉粒的萌发便完全受阻。近年的工作表明,即使那些已经长入雌蕊花柱半途中的花粉管,一经 Research on the mechanism of action of sparse agents has lagged behind the application research of sparse effect. People often ask questions about the effect of a thinning agent on some varieties of fruit, but not on others and the mechanism of thinning of the thinners. In recent years, a great deal of research work has been done on the mechanism of action of the sirturant. When 0.25% dinitro-o-cresol was sprayed onto the stigma of apple flower, pollen germination was completely blocked. Recent work has shown that even those pollen tubes that have grown into the middle of the pistil pattern,