Why is pollen haploid

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The John Innes Charity, Norwich, pp 1— Progamic Phase. Pollen grains germinate on the surface of the stigma in the flower by forming a pollen tube which usually emerges through one of the apertures in the pollen grain wall. The vegetative cell which comprises the bulk of the pollen cytoplasm is responsible for the development of the pollen tube.

The two sperm cells are then transported within the pollen tube and delivered to the embryo sac inside the ovule to allow fertilisation to occur. Flowering plants undergo a unique sexual process called 'double fertilisation', in which one sperm cell fuses with the egg cell to form the diploid zygote which forms the embryo , while the second sperm cell fuses with two haploid nuclei within the central cell to form the triploid primary endosperm.

The primary endosperm nucleus then divides rapidly to support and nourish the developing embryo during seed development. Personal tools Web Editor Log in. You can also search for this author in PubMed Google Scholar. Reprints and Permissions. Cultivation of Haploid Plants from Tobacco Pollen. Nature , — Download citation. Received : 14 October Issue Date : 20 December Anyone you share the following link with will be able to read this content:. Sorry, a shareable link is not currently available for this article.

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