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Protein content of grains of different size fractions in malting barley

Por: Magliano, Patricio Nicolás. Grupo de Estudios Ambientales, IMASL, Universidad Nacional de San Luis and CONICET, Avda. Ejército de los Andes 950, (5700) San Luis, Argentina and School of Agriculture, UBA, INBA-CONICET, Av. San Martín 4453, C1417 Buenos Aires, Argentina.
Colaborador(es): Prystupa, Pablo. School of Agriculture, UBA, INBACONICET, Av. San Martín 4453, C1417 Buenos Aires, Argentina. E-mail: prystupa@agro.uba.ar | Gutiérrez Boem, Flavio Hernán. School of Agriculture, UBA, INBACONICET, Av. San Martín 4453, C1417 Buenos Aires, Argentina. E-mail: prystupa@agro.uba.ar.
ISSN: 2050-0416.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): | GRAIN PROTEIN CONTENT | GRAIN SIZE FRACTIONS | NITROGEN AVAILABILITY | MALTING BARLEY | GRAIN YIELD | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: Journal of the Institute of Brewing no.120 (2014), p.347-352, tbls., grafs.Resumen: The negative relationship between grain size (percentage menor a 2.5mm) and protein content usually observed in barley grain samples is attributed to the presence of thin grains. The objective of this study was to determine whether, in grain samples from a given environment, thin grains had a different protein content than plump grains. Grain samples from field experiments were analysed for grain yield, size and protein content of the whole sample and of four size fractions within each sample. Grain yield ranged from 1.5 to 6.5mgha1 and grain protein (whole sample) ranged from 6.8 to 13.4 %. Most of the variation observed in protein content was explained by the ratio of nitrogen availability to grain yield. Within a grain sample, thin grains had more protein than plump grains (menor a 2.5mm) only when the protein content of the whole sample was high, that is, when the grain sample came from an environment with a high relative abundance of nitrogen. The fact that grain samples with low grain size tend to have high protein content is not due to the presence of a high proportion of thin grains, because thin grains do not always have more protein than plump grains.
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The negative relationship between grain size (percentage menor a 2.5mm) and protein content usually observed in barley grain
samples is attributed to the presence of thin grains. The objective of this study was to determine whether, in grain samples from a given environment, thin grains had a different protein content than plump grains. Grain samples from field experiments were analysed for grain yield, size and protein content of the whole sample and of four size fractions within each sample. Grain yield ranged from 1.5 to 6.5mgha1 and grain protein (whole sample) ranged from 6.8 to 13.4 %. Most of the variation observed in protein content was explained by the ratio of nitrogen availability to grain yield. Within a grain sample, thin grains had more protein than plump grains (menor a 2.5mm) only when the protein content of the whole sample was high, that is, when the grain sample came from an environment with a high relative abundance of nitrogen. The fact that grain samples with low grain size tend to have high protein content is not due to the presence of a high proportion of thin grains, because thin grains do not always have more protein than plump grains.

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