A study of drought-tolerance of soybeans using tolerance indices
Paper Details
A study of drought-tolerance of soybeans using tolerance indices
Abstract
In order to identify the best drought-tolerance indicator an experiment was conducted on four soybean genotypes in a completely random block design with three replications in Moghan plain. Genotypes were grown in the form of two separate plans of normal irrigation and drought stress. In studying the drought-tolerance indices, stress-tolerance indicator (SITI), geometric mean productivity (GMP) and mean productivity (MP) they were highly correlated with yield potential (YP) and yield stress conditions (YS) and were known as the best indicator. The results from STI appear to be more optimal than the other indicators. Genotypes of Hamilton and Apollo are of the highest performance in both stress and non-stress media with 0.408 and 0.485 STI, respectively. Studying mean yield of the grains of these genotypes in normal conditions is 5155 kg/ha and 6068 kg/ha, respectively. Also their mean yield in stress conditions has been 2235, and 2218 kg/ha, respectively indicating a higher yield of these genotypes in both above conditions than other studied cultivars. Hamilton and Apollo genotypes had acceptable and superior potential in both normal and drought-stress conditions and could be considered as superior lines in breeding programs. The first component was termed as yield potential and drought-tolerance justifying 52.334 percent of variance changes and the second component was called stress-sensitive interpreting 47.544 percent of total variations.
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