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Mem 106 c16-starch in megagametophyte: ceratozamia mexicana & zamia furfuracea. reviews, prices and ethical sellers

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Mem 106 c16-starch in megagametophyte: ceratozamia mexicana & zamia furfuracea. sold by nybgshop.org for $4.99

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    Description

This purchase only includes chapter 16 of this title.

Abstract

Megagametophyte maturation in gymnosperms includes nutrient storage and embryoĀ development. In the living Cycadales starch is accumulated before fertilization. HereĀ starch accumulation by the megagametophyte is related to cellularization, archegoniaĀ development, fertilization, and embryogeny. Megastrobili, ovules, and seeds were collectedĀ from their natural localities and fixed in FAA. Starch was detected using histochemicalĀ staining with IKI and PAS. Embryos appeared two years after megastrobilusĀ emergence in Ceratozamia mexicana and one year after this event in Zamia furfuracea. StarchĀ grains in both species were structurally similar, but there were differences in the rate ofĀ formation. This accumulation of starch was not related to embryo development. DuringĀ cellularization and differentiation of archegonia, few starch grains were observed. LaterĀ the starch grains were arranged toward the periphery of the cells and increased in size.Ā Before dispersal, but when the archegonia were mature, starch grains were abundant.




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