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A contribution to the embryology ofTrachelospermum fragrans Hook. f. (Apocynaceae)

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Proceedings / Indian Academy of Sciences

Abstract

Embryology ofTrachelospermum fragrans Hook. f. is described. The anther wall consists of the epidermis, fibrous endothecium, 2–3 middle layers and parietal tapetum. Rarely, endothecium shows 2 layers. The tapetum is uniseriate and remains uninucleate throughout. Simultaneous cytokinesis in pollen mother cells produces tetrahedral and isobilateral tetrads. Degeneration of few pollen grains is recorded. Pollen grain is triporate and 3-celled with few starch grains at anthesis. The ovule is hemianatropous, rarely anatropous, unitegmic and tenuinucellate. The chalazal megaspore of the linear tetrad develops into the 8-nucleate embryo sac of the Polygonum type. Synergids are hooked and the ephemeral antipodals appear egg-like. Fertilization is porogamous. Triple fusion occurs a little earlier than syngamy. The endospermab initio is free nuclear and later becomes cellular. Endosperm haustorium is present. Embryogeny conforms to the Solanad type.

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Authors and Affiliations

  1. Department of Botany, Hans Raj College, 110 007, Delhi, India

    K C Sud

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  1. K C Sud
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Sud, K.C. A contribution to the embryology ofTrachelospermum fragrans Hook. f. (Apocynaceae). Proc. Indian Acad. Sci. 93, 495–501 (1984). https://doi.org/10.1007/BF03053215

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  • DOI: https://doi.org/10.1007/BF03053215

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