Pollen germinating on stigma of Alysseum

Pollen germinating on stigma of Alysseum

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Caption: False-colour scanning electron micrograph (SEM) of pollen grains (oval pitted structures) germinating on the stigma of the sweet alysseum flower (family: Cruciferae). The stigma is the pollen receiving structure which, with the ovary, forms the female reproductive organ; in this case it consists of ridges of finger-like projections. During germination the grains swell, & the furrows visible along one side split to allow the pollen tube to emerge. The tube grows into the stigma, down the style & into the ovary, carrying the male gamete from the pollen grain to fuse with the female ovum contained within the ovary.

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Keywords: botany, germination, grain, grains, nature, plant, plants, pollen, reproduction, reproductive, scanning electron micrograph, sem, stigm, stigma, sweet alysseum, type

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