英语词汇“pollen tube”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

pollen tube

noun Botany

A hollow tube which develops from a pollen grain when deposited on the stigma of a flower. It penetrates the style and conveys the male gametes to the ovule.Guidance of the pollen tube down the style involves mechanical, chemical and physical cues that are not yet fully understood....

In pre-zygotic mechanisms, the pollen tube may grow as far as the ovule but not penetrate it, or penetration may be achieved without fertilization.
The grain is empty because the body cell and prothallial nuclei have moved out along the pollen tube towards the archegonia.

单词	pollen tube
释义	pollen tube noun Botany A hollow tube which develops from a pollen grain when deposited on the stigma of a flower. It penetrates the style and conveys the male gametes to the ovule.Guidance of the pollen tube down the style involves mechanical, chemical and physical cues that are not yet fully understood.... In pre-zygotic mechanisms, the pollen tube may grow as far as the ovule but not penetrate it, or penetration may be achieved without fertilization. The grain is empty because the body cell and prothallial nuclei have moved out along the pollen tube towards the archegonia.
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