Ultrastructural organization of the tomato embryo sac at the time of fertilization

In tomato embryo sac at the time of fertilization noticeable multiplication of the endosperm cytoplasm is observed. The cytoplasm of the egg cell, next to the nucleus, appears loose with distinct mitochondria and plastids. At a distance from the nucleus ribosomes become grouped into a cytoplasmic mass of great uniformity. Nucleolar structure of the egg cell nucleus displaces to its periphery. Its new position seems to he related to the process of fertilization. In the area of the endosperm two nuclei in close contact to each other are found which suggests the beginning of secondary fertilization.

Abstract licence: CC BY

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