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Plant and Soil

, Volume 161, Issue 1, pp 97–101 | Cite as

Shoot/root assimilate allocation and nodulation ofVigna unguiculata seedlings as influenced by shoot light environment

  • M. J. Kasperbauer
  • P. G. Hunt
Article

Abstract

Spectral balance of light received by southern pea [Vigna unguiculata (L.) Walp.] seedling shoots affected photoassimilate allocation among leaves, stems and roots. A higher ratio of far-red (FR) relative to red (R) light resulted in longer stems, higher shoot/root biomass ratio, less massive roots and fewer nodules. The same response pattern to FR/R ratio was obtained in a controlled environment with artificial light sources, or in sunlight where the FR/R ratio was modified by reflection from different colored soil surfaces or by FR reflected from competing plants. The importance of early shoot/root photoassimilate allocation and nodulation may differ according to soil nitrogen availability and moisture content.

Key words

nodulation photomorphogenesis photosynthate partitioning reflected light 

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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • M. J. Kasperbauer
    • 1
  • P. G. Hunt
    • 1
  1. 1.Coastal Plains Soil and Water Conservation Research CenterFlorenceUSA

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