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Dictionary » S » Stigma Stigmastigma The pollen-receptive surface of a carpel or group of fused carpels, usually sticky. The apical end of the style where deposited pollen enters the pistil.An external tracheal aperture in a terrestrial arthropod.A skin lesion that is a diagnostic sign of some disease.The area of a plant where pollen is deposited for fertilisation. Usually the stigma will bear a sweet solution which can attract bees. In turn, the bees will land on the plant, pick up the pollen grains and transport them elsewhere, i.e. to another plant,.
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Results from our forumHow does seeds formed after pollination?... can occur many times within one plant. Some flowers might have several ovules. Each ovule contains one ovum. When pollen grains land on the stigma, more than one pollen tubes can be formed and each carries a male gamete to one ovule.
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Sexual selection in plants... the mechanism whether 2 plants are able to cross and produce fertile progeny. For those incompatible, the pollen (male determinant) that fall on stigma (female determinant) will not germinate; pollen tube will not form; fertilization will not occur, etc... I will suggest you to read through "incompatibility" ...
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The Colin Leslie Dean species paradox... "pollination syndrome" plants have chemical signaling pathways that prevent intra-generic pollination (ie rose pollen lands on iris stigma - nothing happens). On a side note: In my part of the world, the wild irises hybridize so commonly it can be infuriating (impossible) to try ...
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The need to stretch?... throughout the day, I also stretch. I spent twenty years leading other people to do this stuff. Unfortunately, I feel that there is an unspoken stigma against public stretching. One of my students from years ago put it nicely and bluntly. She said something like, "People who are not in ...
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Late-acting system... employ late-acting systems,in which the ovule aborts when fertilized or shortly after fertilized when the same flower's pollens fall on its stigma. But the abortion will make this flower lose one chance to spread its genes, though this chance will produce a inferior seed. Is that worth it? ...
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