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The stigma, together with the style and ovary (typically called the stigma-style-ovary system) comprises the pistil, which is part of the gynoecium or female reproductive organ of a plant. The stigma itself forms the distal portion of the style, or stylodia, and is composed of stigmatic papillae , the cells of which are receptive to pollen.
The eyespot apparatus (or stigma) is a photoreceptive organelle found in the flagellate or (motile) cells of green algae and other unicellular photosynthetic organisms such as euglenids. It allows the cells to sense light direction and intensity and respond to it, prompting the organism to either swim towards the light (positive phototaxis ...
Close-up of a Schlumbergera flower, showing part of the gynoecium (specifically the stigma and part of the style) and the stamens that surround it. Plant reproductive morphology is the study of the physical form and structure (the morphology) of those parts of plants directly or indirectly concerned with sexual reproduction.
The stigma is a ridge or edge on the lower surface of the branch, near the tip of the lobes. [4] Branched styles also appear in the genera Dietes, Pardanthopsis, and in most species of the genus Moraea. [5] In Crocus species, the style is branched into three "branches," forming a tube. [6] Plants of the genus Hesperantha have a spread-out ...
This stigma has the form of a small bowl, the clinandrium, a viscous surface embedding the (generally) single anther. On top of it all is the anther cap. Sometimes there is a small extension or little beak to the median stigma lobe, called rostellum. [citation needed] Column wings may project laterally from the
Herkogamy (or hercogamy) is the spatial separation of the anthers and stigma in hermaphroditic angiosperms. It is a common strategy for reducing self-fertilization. It is a common strategy for reducing self-fertilization.
Xenogamy (Greek xenos=stranger, gamos=marriage) is the transfer of pollen grains from the anther to the stigma of a different plant. This is the only type of cross pollination which during pollination brings genetically different types of pollen grains to the stigma.
Homogamy is when the anthers and the stigma of a flower are being matured at the same time. [5] The action of self-pollination guides the plant to homozygosity , causing a specific gene to be received from each of the parents leading to the possession of two exact formats of that gene.