Stigma

Virginia N. Fred

Cape Coral, United States

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Artist's Description

Stigma — is the receptive tip of the carpel, which receives pollen at pollination and on which the pollen grain germinates. The stigma is adapted to catch and trap pollen, either by combining pollen of visiting insects or by various hairs, flaps, or sculpturings
Stigmas can vary from long and slender to globe shaped to feathery. Their role in the life cycle of angiosperms is to receive and adhere to pollen from whatever vector has carried it from it flower of origin. Stigmas must distinguish and reject the pollen of other species, and in some cases the pollen from the same or genetically similar flowers. This self incompatibility function ensures outcrossing. Styles are always tube-like — either long or short.
Pollen is typically highly desiccated when it leaves an anther. Stigmas have been shown to assist in the rehydration of pollen and in promoting germination of the pollen tube. Stigmas also ensure proper adhesion of the correct species of pollen. Stigmas can play an active role in pollen discrimination and some self-compatibility systems involve interaction between the stigma and the surface of the pollen grain.
The style can be open (containing few or no cells in the central portion) or closed (densely packed with cells throughout). Pollen tubes grow the length of the style to reach the ovules. Studies have shown that in some species, at least, the pollen tube is directed to the micropyle of the ovule by the style.
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Photo taken in my home in Cape Coral Florida

Canon EOS DIGITAL REBEL XTi
Tv(Shutter Speed) 1/60Sec.
Av(Aperture Value) F4.0
Metering Modes Split metering
Exposure Compensation 0
ISO Speed 400
Lens EF-S60mm f/2.8 Macro USM
Focal Length 60.0 mm
Image Quality RAW
Flash On
White Balance Auto
AF mode One-Shot AF
HandHeld

Artwork Comments

desktop tablet-landscape content-width tablet-portrait workstream-4-across phone-landscape phone-portrait
desktop tablet-landscape content-width tablet-portrait workstream-4-across phone-landscape phone-portrait

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