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The relative performance of white clover genotypes with rhizobial and mineral nitrogen in agar culture and in soil
Authors:L R MYTTON
Institution:Welsh Plant Breeding Station, Aberystwyth
Abstract:Vegetative propagules of adult plants of white clover grown in agar culture show a better agreement with the performance of adult plants grown in soil than that previously reported of nodulated seedlings. This suggests that, whilst results obtained from the inoculation of seedlings can only be extrapolated to other situations with great caution, laboratory techniques which allow nitrogen fixation assessments to be made on adult plants may be useful in predicting performance under more natural conditions. The growth of vegetative propagules of mature plants dependent on rhizo-bium fixed nitrogen was also compared with propagules receiving abundant inorganic nitrogen. In agar culture there were no differences in yield between nitrogen sources, indicating that the symbiotic associations could fix sufficient nitrogen for growth under these relatively restrictive conditions. In soil, however, only the slower genotypes came near to providing sufficient nitrogen from symbiosis to sustain their potential yield as measured from their growth with inorganic nitrogen. The more vigorous the genotype the greater was the short-fall in nitrogen supplied by the rhizobium association. Joint regression analysis showed that any apparent interactions between plant genotypes and the source of nitrogen was a function of the genotypes' potential growth rate. The importance of quantifying nitrogen fixation in relation to the growth potential of the host genotype is emphasized, and the need, in legume breeding programmes, for simultaneous selection of host and rhizobium is discussed.
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