Developmental Sequence of Embryo and Endosperm in Apomictic and Sexual Forms of Poa pratensis

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Abstract
The comparative development of the embryos and endosperms was examined in 2 plants, each of known apomictic or sexual reproductive tendencies. The development of the embryos begins before anthesis, and the first division of the fusion nucleus occurs at least a day following anthesis in apomictic forms of P. pratensis. In sexual individuals, the endosperm development is in advance of the zygote or proembryo during the first 2 days following anthesis. Five days after pollination, and subsequently, the development of both the embryo and endosperm in the 2 differently reproductive types of plants is essentially parallel, and the 2 types are then indistinguishable from each other.

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