单词	pollen tube
释义	pollen tube noun : a tube that is formed by a pollen grain and conveys the sperm nuclei to the embryo sac of an angiosperm or the archegonium of a gymnosperm Example Sentences Recent Examples on the Web How many readers could get excited by the fact that a single primrose plant can produce two kinds of flowers, virtually identical but one with a long style (the stalk that channels pollen tubes to the ovary) and one with a short style? David Quammen, The New York Review of Books, 8 Apr. 2020 Word History First Known Use 1830, in the meaning defined above
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