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Stigma

stigma

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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Structure of flower

... the male gametes. Immature male gametophyte with a protective outer covering. Carpel\Pistil Female part of the flower. Consisting of the stigma, style and ovary. Stigma Often sticky top of carpel, serves as a receptive surface for pollen grains. Style The stalk of a carpel, between the ...

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by snowfall
Thu May 30, 2013 5:29 pm
 
Forum: Botany Discussion
Topic: Structure of flower
Replies: 3
Views: 6175

Structure of flower

... are two parts of androceium. 4.gynoecium:- it is female reproductive whorl. unit of gynoecium is called carpel. carpel consist of three parts viz. stigma, style & ovary.

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by zodesujit
Sun May 19, 2013 5:46 am
 
Forum: Botany Discussion
Topic: Structure of flower
Replies: 3
Views: 6175

How 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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by AndyYip
Sat Sep 29, 2012 4:20 pm
 
Forum: Botany Discussion
Topic: How does seeds formed after pollination?
Replies: 1
Views: 4535

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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by magicsiew
Fri Dec 10, 2010 8:20 pm
 
Forum: Botany Discussion
Topic: Sexual selection in plants
Replies: 7
Views: 3290

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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by AstusAleator
Wed Jul 01, 2009 5:21 am
 
Forum: Evolution
Topic: The Colin Leslie Dean species paradox
Replies: 135
Views: 174552
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