tube nucleus


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tube nucleus

one of two haploid nuclei within a developing POLLEN TUBE, whose function may be control of tube growth.
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The haploid microspore nucleus divides mitotically to produce two haploid nuclei: the tube nucleus and the generative nucleus.
The tube nucleus is so called because after the pollen grain lands on a receptive stigma, the tube nucleus directs pollen germination through one of the pores in the exine and forms a pollen tube down through the tissue of the style.
1] hybrid gamete gene homozygote inbred indehiscent mesocarp nut open-pollinated seeds parthenocarpy perfect pericarp pollen sac quantitative trait self-incompatible self-sterile tube nucleus zygote