POST-FERTILIZATION DEVELOPMENT IN INDOTRISTICHA RAMOSISSIMA (WIGHT) VAN ROYEN

Authors

  • ANTONY J. MUKKADA,

    1. Department of Biological Sciences, University of Cincinnati, Cincinnati, Ohio 45221, U.S.A., and Department of Botany, University of Delhi, Delhi 7, India
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  • R. N. CHOPRA

    1. Department of Biological Sciences, University of Cincinnati, Cincinnati, Ohio 45221, U.S.A., and Department of Botany, University of Delhi, Delhi 7, India
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SUMMARY

In Indotristicha ramosissima (Wight) van Royen there is normal syngamy. However, the polar nucleus is not fertilized so that a primary endosperm nucleus is not formed. Consequently, there is no endosperm in the seed. The post-fertilization dissolution of the nucellar cells below the embryo sac results in the formation of a pseudo-embryo sac into which the growing pro-embryo penetrates. The first division of the zygote is transverse and the development of the embryo conforms to the Solanad type. The embryo possesses a large, coenocytic haustorial cell which disorganizes by the time the embryo is fully differentiated. The integuments and the ovary wall are rich in starch deposits which disappear during maturation. In the mature seed, the outermost layer of the outer integument becomes mucilaginous. The cells of the inner epidermis of the ovary wall become binucleate and occasionally multinucleate.

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