Effect of nitrogen on protein content, and aminoacid composition in dry bean seeds

• Autor(a) principal: Carelli, Maria Luiza C.
• Data de Publicação: 2014
• Outros Autores: Fahl, Joel Irineu, Teixeira, João Paulo F.
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Pesquisa Agropecuária Brasileira (Online)
• Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/17110
• topic: nitrogen fertilization; vermiculite; pots; lysine; cysteine; leucine; methionine; adubação nitrogenada; vermiculita; vasos; cobertura; valina; treonina; metionina

Greenhouse and field experiments were conducted with bean Phaseolus vulgaris L., cv. Aroana, in order to study the effect of N on protein content of seeds. In greenhouse, the plants were cultivated in pots, with vermiculite and irrigated with nutrient solution containing 70, 210 and 630 ppm of N. In the field, N was dressed in the form of NH4NO3, at rates of 0, 50 and 100 kg/ha, at flowering stage. The content of protein in the seeds, at harvest, was 24.7, 27.6 and 33.7%, respectively, for levels of 70, 210 and 630 ppm. In the field, 100 kg/ha of N resulted in increases of 27.8, 20.7 and 28.1%, respectively, in the contents of total N, protein-N and nonprotein-N, when compared with check. Nitrogen dressing increased the content of lysine, cystine and leucine and reduced that of valine, threonine and methionine while phenylalanine and isoleucine contents were not affected.