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Embryology of three species ofEhretia

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Proceedings / Indian Academy of Sciences

Abstract

Embryology of three species ofEhretia (E. ovalifolia, E. microphylla andE. laevis) is described. The anther is tetrasporangiate and the wall corresponds to the ‘Dicotyledonous’ type. Reduction divisions in microsporocytes are simultaneous and tetrads are tetrahedral and decussate. Occasionally, isobilateral tetrads are met with. Polyspory is common. The pollen grains are usually shed at the two-celled stage. The ovules are anatropous, unitegmic and crassinucellar. An endothelium differentiates. Both Polygonum and Allium types of megagametophytes coexist. The endosperm is Cellular with four-celled micropylar and four-celled chalazal haustoria. Embryogeny is of the Onagrad type, and suspensor is four-celled.

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Authors and Affiliations

  1. Department of Botany, Andhra University, 530 003, Waltair, India

    B Hanumantha Rao

  2. Department of Botany, Nagarjuna University, 522 510, Nagarjunanagar, Guntur, India

    P S Prakasa Rao

Authors
  1. B Hanumantha Rao
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  2. P S Prakasa Rao
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Rao, B.H., Rao, P.S.P. Embryology of three species ofEhretia . Proc. Indian Acad. Sci. 93, 57–65 (1984). https://doi.org/10.1007/BF03053008

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  • DOI: https://doi.org/10.1007/BF03053008

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