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      Permanent link:
      https://www.ias.ac.in/article/fulltext/plnt/090/05/0401-0411

    • Keywords

       

      Embryo; embryoid; shoot bud; embryogenesis; ontogeny; tissue differentiation

    • Abstract

       

      The ontogeny of the embryoids arising from a variety of somatic and male gametophytic tissues has been compared to that of a zygote embryo; it has often been stressed that a free cellrecapitulates the ontogenetic sequence of stages that are seen in the development of a zygote into an embryo. An embryoid significantly lacks a polarised ontogenetic pattern throughout the gamut of differentiation; it lacks typical centres of polar organization like the hypophysis and the epiphysis in early ontogeny; the protoderm formation is belated and also incomplete; the organization of tap root is suppressed. In spite of assuming exomorphic contours comparable with those of the gross developmental stages recognized in embryogenesis consequential to sexual fusion, the embryoid is devoid of internal differentiation both in degree and pattern. Under these circumstances the ontogeny of an embryoid never stands comparison with that of a zygotic embryo. From the morphological standpoint an embryoid is more closely related to a shoot bud.

    • Author Affiliations

       

      B G L Swamy1 K V Krishnamurthy2

      1. Department of Botany, Mysore University, Mysore - 570 006, India
      2. Department of Botany, Madras University P.G. Centre, Tiruchirapalli - 620 020, India
    • Dates

       
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