Genotypic lipoxygenase variation in soybean seeds and response to nitrogen nutrition
1995
Zougari, A. | Guy, S. | Planchon, C. (Institut National Polytechnique (ENSAT), Toulouse (France). Laboratoire de Biotechnologie et Amelioration des Plantes)
Decreasing the lipoxygenase content of soybean (Glycine max (L.) Merr.) seed is a prerequisite for its increased use in human foods. These investigations aim to analyse the variation of lipoxygenase contents in relation to the genotype or the nitrogen nutrition of the plant. Four genotypes from a divergent selection for N2 fixation and the recurrent parent, Weber, were grown in pots, and two Bradyrhizobium japonicum strains (G.49 and SMGS1) were used. Dinitrogen fixation was estimated in situ using the acetylene-reduction assay. The lipoxygenase activity was determined polarographically on seeds taken from plants grown under controlled conditions in the presence or absence of symbiotic N2 fixation. The large genotypic variation observed for the lipoxygenase contents was enhanced by high N2 fixation. The variation range of lipoxygenase contents, which was obtained through the combination of the genotypic variation and the N2 fixation activity, was relatively large with a ratio of 2 on a seed dry-weight basis and a ratio of 2.6 when the total proteins were considered. Decreased lipoxygenase content and increased total protein content can thus be considered in parallel in a genetic context together with more efficient N2 fixation.
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