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Morphogenesis of Primordia of Lateral Roots

  • D. Davidson
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 18)

Abstract

When an angiosperm seed germinates the radicle of the embryo grows out and develops into the primary root; this later becomes a complex structure by giving rise to lateral, or secondary, roots. The emergence of the radicle and the subsequent growth of the primary root show a marked polarity: new cells generated by mitosis and the new growth produced by cell elongation are added almost exclusively along one axis. The primary root shows longitudinal growth. It may be inferred from this observation that 1) the pattern for the future growth of the primary root is established during the period of embryogenesis and 2) the internal physiological conditions necessary to realize this imprinted growth pattern exist in the embryo or are established under normal conditions of germination. All primary growth of the primary root that occurs after radicle emergence perpetuates the initial polarized growth along one axis and the root has the form of a long cylinder with a conical apex.

Keywords

Lateral Root Mitotic Index Primary Root Quiescent Center Tetraploid Cell 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1972

Authors and Affiliations

  • D. Davidson
    • 1
  1. 1.Department of BiologyMcMaster UniversityHamiltonCanada

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