Authors : C. A. Nikhade
Page Nos : 151-164
Description :
The paper deals with the embryological investigations on Aristida adscensionis. The Voucher specimen: N-1deposited in Botany department of RTM Nagpur University. The female gametophyte, fertilization and endosperm development described in details. A mature ovule is the organ that forms seed of flowering plants. It is borne inside the ovary of the flower and consists of nucellus protected by integuments. The precursors of embryo/endosperm and seed coats gradually developed after fertilization. Fertilization is porogamous. A diploid zygote(2n) cell divide and redivide to form a multicellular embryo. A primary endosperm nucleus (3n) invariably divides and forms free nuclear stage, embryo sac increase in size considerably and cellular phase of endosperm sets in at 8-10 cell stage of embryo development. The ovule is Campylotropous, body of the ovule is curved this results in the micropyle and chalaza being not aligned in a straight line (Micropyle almost touching to the funiculus). During seed development the entire nucellus is consumed by developing embryo. During gradual growth of embryo, consumes earlier a part of cellular endosperm at micropyle region. The mature embryo is not embedded in the endosperm but lies peripheral to it. The seeds are endospermic in the present taxa.
