Protein and hordein fraction content in barley seeds as affected by sowing date and their relations to malting quality

Abstract

The effect of sowing date on grain protein, hordein fraction content and malting quality of two-rowed spring barley was investigated by using ten commercial cultivars with different grain protein content and the relationships among these traits were examined. The results showed that grain protein content and B hordein content increased as the sowing date postponed and were significantly affected by sowing date, while C and D hordein contents were less influenced by sowing date. There were significant differences in grain protein and hordein fraction content among the ten cultivars. The coefficient of variation of D hordein content was much larger than that of B and C hordein contents, suggesting its greater variation caused by different sowing dates. Beta-amylase activity and diastatic power were also significantly affected by sowing date, with malt extract being less affected. Significant differences in measured malt quality were found among the ten cultivars. Grain protein was significantly correlated with B hordein and malt extract positively and negatively, respectively. There was no significant correlation between beta-amylase activity or diastatic power and grain protein content. B hordein was negatively and significantly correlated with malt extract, but no significant correlations between C hordein, D hordein and malting quality traits.

Genetic variability in elite barley genotypes based on the agro-morphological characteristics evaluated under irrigated system

“…Although those accesses were elite genotypes, they indicated a wide variation in the protein content, presenting a value up to 14.13% (C-70). The genotype -environment interaction might explain the fact that an access, like cultivar BRS 180, ended up showing variability in its protein content (Molina-Cano et al, 1997;Qi et al, 2005;Yalçin et al, 2007). In an irrigated system in the Brazilian savannah, Amabile et al (2008) observed a great variability regarding the protein content within the same year or in different years.…”

Barley Grain Yield and Protein Content Response to Deficit Irrigation and Sowing Dates in Semi-Arid Region

“…The smallest protein contents for straw (1.84% and 1.64%) and grain (5.4% and 4.9%) were achieved in the first and second year, respectively by full irrigation method due to early time of sowing at 23 October. The results of the study carried out by Qi et al (2005) indicated that grain protein content increased as the sowing date was postponed and it was significantly affected by the sowing date. In their research sowing date in 26 March had smallest, while sowing date in 25 April had the highest largest, content of protein in the barley grain.…”

NAM-1gene polymorphism and grain protein content in Hordeum

“…In barley, proteins are related to malting quality by their multiple roles in yeast nutrition, in haze formation in beer (See et al, 2002), in foam stability (Roberts et al, 2003), in enzyme activities (Clancy et al, 2003;Hayes et al, 2003) and in PAGE protein profile related to endosperm structure (Qi et al, 2005).…”