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Selection for Water‐Stress Tolerance in Interracial Populations of Common Bean
Author(s) -
Singh Shree P.
Publication year - 1995
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1995.0011183x003500010022x
Subject(s) - biology , heritability , population , phaseolus , cultivar , crop , irrigation , water stress , yield (engineering) , mesoamerica , drought tolerance , horticulture , agronomy , gene–environment interaction , genetic variability , zoology , demography , geography , genotype , genetics , metallurgy , materials science , archaeology , sociology , gene
Crop cultivars that tolerate water stress would stabilize and expand production in drought endemic environments. They would require less irrigation and help conserve water, an essential natural resource. My objectives were to (i) compare, in water‐stressed and nonstressed environments, the performance of inbred lines from interracial populations of common bean ( Phaseolus vulgaris L.), involving water‐stresstolerant parents, (ii) identify lines that out‐yielded the parents, and (iii) determine heritability and expected gains from selection. Eighty‐five F s ‐derived F s random lines, a population bulk, and four parents from each of two populations (TR 7790 and TR 7791) were evaluated between 1991 and 1993 at Palmira, Colombia. The TR 7790 population involved crosses between common bean races Mesoamerica and Durango, and TR 7791 involved races Mesoamerica and Nueva Granada. Water stress reduced seed yield and 100‐seed weight and accelerated maturity. The mean seed yield for population bulk, inbred lines, and parents of TR 7790 in both water‐stressed and nonstressed environments were higher than those of TR 7791. In population TR 7790, eight lines yielded higher (by an average of 52%) than the mean of parents and six lines yielded higher (by an average of 41%) than the highest yielding parent under water stress. In population TR 7791, eight lines yielded higher than the mean of parents and one line yielded higher than the best parent under water stress. For seed yield, heritability was low for TR 7791 (0.26 ± 0.18 to 0.38 ± 0.17) and high for TR 7790 (0.66 ± 0.15 to 0.80 ± 0.15). Expected gains from selection ranged from 10 to 48%. These results justify searching for and using more germplasm highly tolerant to water stress from races Durango and Mesoamerica.