• Embryological studies in lentibulariaceae - I. Floral morphology and embryology ofUtricularia smithiana, Wt. Ic.

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    • Keywords


      Floral Morphology; Megaspore Mother Cell; Embryological Study; Microspore Mother Cell; Microspore Tetrad

    • Abstract


      Embryology ofUtricularia smithiana has been studied and its systematic position as a species separate fromUtricularia caerulea has been justified.

      Floral parts arise in acropetalous succession. A transection of an young anther lobe shows a layer of microspore mother cells surrounded by tapetum, a middle layer, an endothecium and an epidermis. Microspore tetrads are decussate and tetrahedral. Tapetum is glandular. Pollen grain is shed at the 3-nucleate stage. Endothecium exhibits fibrillar thickenings.

      Embryosac development is of the polygonum type. Placental nutritive tissue is present only at the micropylar region. Embryosac is surrounded by the endothelium only at the central region.

      Fertilisation is porogamous and endosperm isab initio cellular. Endosperm haustoria are not very aggressive. Embryogeny conforms to solanad type. Mature embryo is undifferentiated with starch grain filled cells.

    • Author Affiliations


      S Sundara Rajan1 D Jeevan Kumar1

      1. Department of Botany, St. Joseph’s College, Bangalore - 560001, India
    • Dates


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