Nitrogen Fixation by Hybrids of White Clover (Trifolium repens L.) and Trifolium nigrescens

M. T. Abberton, J. H. Macduff, A. H. Marshall, T. P. T. Michaelson-Yeates

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14 Citations (SciVal)

Abstract

Development of hybrids between white clover (Trifolium repens L.) and Trifolium nigrescens provides a novel route for genetically improving the reproductive capacity of white clover, provided the hybrids are agronomically viable, particularly with respect to N 2 fixation. A comparative study of growth and rates of N 2 fixation over 21 days was conducted with the parental species, F 1 hybrids and backcross hybrids, in flowing solution culture, without a supply of mineral N to the plants. T. nigrescens was unable to fix N 2 in association with the strains of Rhizobium leguminosarum biovar, trifolii selected for inoculation. Rates of N 2 fixation per plant increased in the order T. nigrescens < F 1 hybrid < T. repens < backcross L. Specific rates of N 2 fixation (days 0-21) increased in the order T. nigrescens < F 1 hybrid < backcross l < T. repens. Dry matter production and nodule biomass per plant increased at a higher rate in backcross l hybrids than in T. repens. The results suggest that the potential for N 2 fixation by backcross 1 hybrids is at least as great as that by T. repens.

Original languageEnglish
Pages (from-to)27-33
Number of pages7
JournalJournal of Agronomy and Crop Science
Volume183
Issue number1
DOIs
Publication statusPublished - 01 Jul 1999

Keywords

  • Backcross
  • F hyrids
  • Nitrogen fixation
  • Trifolium nigrescens
  • Trifolium repens

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