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pollen tube
Значение термина pollen tube в knolik
pollen tube - pollen tube
pollen tube - Tube formed on germination of pollen grain that carries male gametes to egg. In flowering plants each pollen tube penetrates tissues of stigma and style into ovary. After entering ovary pollen tube grows towards an ovule, passing down micropyle to nucellus and finally penetrating nucellus tissues into embryo sac where it ruptures at the tip, setting free two male gametes one of which fuses with egg nucleus. The second male nucleus fuses with the central fusion nucleus; the resulting nucleus is known as the endosperm nucleus and from it arises endosperm.
Рядом со словом pollen tube в knolik
| pollen analysis | В начало буква "" буквосочетание "" | pollex |
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