Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/28942
Título: Seeds with high molybdenum concentration improved growth and nitrogen acquisition of rhizobium-inoculated and nitrogen-fertilized common bean plants
Título(s) alternativo(s): Sementes com alta concentração de molibdênio aumentaram o crescimento e a aquisição de nitrogênio de plantas de feijoeiro inoculadas com rizóbio ou sob fertilização nitrogenada
Palavras-chave: Molibdênio
Fixação biológica de nitrogênio
Fertilização nitrogenada
Molybdenum
Nitrogen-fixing species
Nitrogen fertilization
Data do documento: 2013
Editor: Sociedade Brasileira de Ciência do Solo
Citação: ALMEIDA, F. F. D.; ARAÚJO, A. P.; ALVES, B. J. R. Seeds with high molybdenum concentration improved growth and nitrogen acquisition of rhizobium-inoculated and nitrogen-fertilized common bean plants. Revista Brasileira de Ciência do Solo, Viçosa, MG, v. 37, n. 2, p. 367-378, 2013.
Resumo: Seeds of common bean (Phaseolus vulgaris) with high molybdenum (Mo) concentration can supply Mo plant demands, but to date no studies have concomitantly evaluated the effects of Mo-enriched seeds on plants inoculated with rhizobia or treated with N fertilizer. This work evaluated the effects of seed Mo on growth and N acquisition of bean plants fertilized either by symbiotic N or mineral N, by measuring the activities of nitrogenase and nitrate reductase and the contribution of biological N2 fixation at different growth stages. Seeds enriched or not with Mo were sown with two N sources (inoculated with rhizobia or fertilized with N), in pots with 10 kg of soil. In experiment 1, an additional treatment consisted of Mo-enriched seeds with Mo applied to the soil. In experiment 2, the contribution of N2 fixation was estimated by 15N isotope dilution. Common bean plants grown from seeds with high Mo concentration flowered one day earlier. Seeds with high Mo concentration increased the leaf area, shoot mass and N accumulation, with both N sources. The absence of effects of Mo application to the soil indicated that Mo contents of Mo-enriched seeds were sufficient for plant growth. Seeds enriched with Mo increased nitrogenase activity at the vegetative stage of inoculated plants, and nitrate reductase activity at late growth stages with both N sources. The contribution of N2 fixation was 17 and 61 % in plants originating from low- or highMo seeds, respectively. The results demonstrate the benefits of sowing Mo-enriched seeds on growth and N nutrition of bean plants inoculated with rhizobia or fertilized with mineral N fertilizer.
URI: http://repositorio.ufla.br/jspui/handle/1/28942
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