(botany) a slender tubular outgrowth from a pollen grain when deposited on the stigma for a flower; it penetrates the style and conveys the male gametes to the ovule
双语例句
A serologic reaction retards the growth of the pollen tube. 血清反应阻止花粉管生长。
Activation of nucellar cells by discharge from the pollen tubes has been claimed. 认为由花粉管的流出物能使珠心细胞活化。