SEM of pollen germinating stigma of turnip flower

SEM of pollen germinating stigma of turnip flower

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Caption: False-colour scanning electron micrograph (SEM) of pollen germinating on the stigma of the turnip flower, Brassica campestris. Of the many pollen grains which have lodged amongst the finger-like projections of the stigma, two have germinated & produced pollen tubes (centre right & bottom left). The pollen tube grows down inside the stigma, through the style (the column on which the stigma is supported) & enters the ovary at the base of the style; it protects & conveys two male gametes (sperm cells) to the female egg for fertilisation. Magnification: x400 at 6x4.5 cm , x250 at 35mm size. Red, pink & green.

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Keywords: botany, brassica campestris, nature, plant, plants, pollen tube, reproduction, reproductive, stigma, turnip

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