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


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.

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Kasperbauer, M.J., Hunt, P.G. Shoot/root assimilate allocation and nodulation ofVigna unguiculata seedlings as influenced by shoot light environment. Plant Soil 161, 97–101 (1994).

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Key words

  • nodulation
  • photomorphogenesis
  • photosynthate partitioning
  • reflected light