• Apomixis and its utilisation in grain sorghum—II; embryology ofF1 progeny of reciprocal crosses between R473 and 302

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    • Keywords


      Embryology; apomixis; grain sorghum

    • Abstract


      The embryology ofF1 progeny of reciprocal crosses between R473 and 302 has been investigated. The anther wall development follows the monocotyledonous type. Successive cytokinesis in the microspore mother cells results in the formation of isobilateral pollen tetrads. Pollen grains are 3-celled at the shedding stage. Although 90% of pollen are fertile, the germination is only about 70%. Abortive pollen grains are noticed in some anthers. The ovule is anatropous, bitegmic and pseudocrassinucellar. Archesporium or megaspore mother cell, if formed, degenerates. The embryo sac developed aposporously from a nucellar cell, is always 8-nucleate with a secondary increase in the antipodal cells. Fertilisation does not take place. The autonomous development of embryo and endosperm occurs under the stimulus of pollination. Like the two parents theF1 progeny exhibit apomixis of the nature of somatic apospory associated with self-incompatibility.

    • Author Affiliations


      R Narsa Reddy1 L L Narayana1 N G P Rao2

      1. Department of Botany, Kakatiya University, Vidyaranyapuri - 506 009
      2. AICSIP, Rajendranagar, Hyderabad - 500 030
    • Dates


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