| 单词 | pollen tube |
| 释义 | pollen tube (once / 454589 pages) n WORD FAMILY pollen tube: pollen tubes USAGE EXAMPLESTheir petals flare out at the tip to form a star, out of which a single spindly pollen tube protrudes. The New Yorker(Feb 16, 2016) As it descends, being moved by water currents, a branched pollen tube grows out. Scientific American(Aug 18, 2015) "In Cretaceous flowers, we've never before seen a fossil that shows the pollen tube actually entering the stigma," said Prof Poinar. BBC(Jan 10, 2014) n (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 Hyper plant part, plant structure any part of a plant or fungus |
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