Combining ability analysis and selection effectiveness for tolerance to cold-induced sterility in rice
1988
Moon, H.P. (Rural Development Administration, Suwon (Korea R.). Crop Experiment Station) | Neil Rutger, J. (Univ. of California, (USA). Dept. of Agronomy and Range Science)
Cold-induced sterility is a problem of rice (Oryza sativa L.) production in temperate regions and high elevation tropics. The present study was conducted to measure combining ability, determine character associations, and to evaluate effectiveness of F2 selection for tolerance to this type of cold injury. The F1, F2, F3 and reciprocal backcross F1 populations of a nine-parent diallel were grown at Davis, California, a relatively cool location for rice. Additive genetic variance was predominant but some non-additive genetic variance existed for cold tolerance. Good general combining ability (GCA) was generally associated with the cold tolerant parents, 'M-101' and 'L-201', and poor GCA with the most susceptible parent, 7703008. Sterility was positively correlated with late heading, negatively with mature plant height, and negatively with spikelet number. Of the three agronomic characters, heading date had the greatest influence on sterility. Selection of F2's in seven crosses involving M-101, the most cold-tolerant parent, was effective for increasing cold tolerance. Realized heritability estimates for cold tolerance averaged 0.53, and observed selection response for cold-induced sterility averaged -9.4 percentage points
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