Abstract
ABSTRACTTwenty‐three entries of grain sorghum (Sorghum bicolor (L.) Moench), including eight inbred lines (five males and three females) and 15 hybrids, were evaluated to determine the proportion of γ, αII, and β‐αI‐kafirins and their association with contents of crude protein, fat, and starch; protein digestibility; in vitro dry matter disappearance; and seed weight. The male lines included three normal‐seeded lines (TX2737, TX435, and P954063) and two large‐seeded lines (Eastin1 and PL‐1). Female lines consisted of three common U.S. seed parent lines (Wheatland, Redlan, and SA3042). The lines and their hybrids were grown under dryland conditions at two locations in Kansas using a randomized complete block design. The effects of genotype, location, and males were significant for all kafirins. Wide variations in composition and general combining ability (GCA) for kafirin content were noted among parent lines and hybrids, with TX2737, Eastin1, and PL1 having the largest GCA values for γ (1.37), αII (1.99), and β‐αI (2.57), respectively. Correlations among kafirins ranged from ‐0.89 to 0, whereas those of kafirins with feed quality traits, digestibility, and seed weight ranged from ‐0.45 to 0.48.
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