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Important stages in the development of different layers and areas of sporoderm in angiosperms

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Abstract

The morphological patterns of sporoderm development are illustrated by the example of pollen grains with different aperture types based on published results of transmission electron microscopy (TEM). It is noted that all studied pollen grains are characterized by the development of the periplasmic space between the plasmalemma and callose, where the primexine matrix and primexine begin to form. The aperture areas remain almost invariable during marking and formation of ectexine. The aperture plug and endexine are formed before dissolution of the callose. As the callose is dissolved, microspore is surrounded by a young sporoderm throughout the perimeter. Intine begins to form in the aperture with the pollen grain maturation. Intine displaces the aperture plug from the aperture center (pollen tube exit site) by the time of anthers opening. Direct conversion of the aperture plug into a complex multilayer intine occurs only during the formation of the outer layer of intine of some monocots.

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Polevova, S.V. Important stages in the development of different layers and areas of sporoderm in angiosperms. Paleontol. J. 48, 1324–1329 (2014). https://doi.org/10.1134/S0031030114120077

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  • DOI: https://doi.org/10.1134/S0031030114120077

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