exine
enUKex·ine
E0276700 (ĕk′sēn′, -sīn′)exine
(ˈɛksɪn; -aɪn) orextine
ex•ine
(ˈɛk sin, -saɪn)n.
| 单词 | exine |
| 释义 | exineenUKex·ineE0276700 (ĕk′sēn′, -sīn′)exine(ˈɛksɪn; -aɪn) orextineex•ine(ˈɛk sin, -saɪn)n. ExineenUKexine[′ek‚sēn]Exine(also exosporium), in seed plants, the outer layer of the wall of pollen grains (microspores). In many plants the outside of the exine has nodules or reticular enlargements, which form specific patterns characteristic of a particular species and are there fore often used to identify the species to which a pollen grain belongs. exineenUKexine(ĕk′sēn′, -sīn′)exinethe outer coat of a POLLEN GRAIN, that often has protuberances, spines, etc. The exine also has one or more areas where the wall is thin, forming a pore through which the pollen tube will protrude. |
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