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To assess the stability of grain yield in advanced bread wheat cultivars and lines across cold and temperate regions, an experiment was conducted using 43 Line along with three control cultivars, Sadra, Hashtroud, Hoor, Jam and Sardari. The study was based on completely randomized block design with four replications and was carried out over three cropping years (1400-1403) across nine research stations: Maragheh, Qamlo, Sararoud, Qidar, North Khorasan (Shirvan), Marzari, Ardabil, Hamadan and Urmia. Grain yield data were analyzed using additive main effects and multiplicative interaction (AMMI) model, as well as various parametric and nonparametric stability statistics. The results showed that the average yield of the studied genotypes was 2040 kg/ha, with yield values ranging 2159 kg/ha for genotype No.2 (Jam variety) to 1835 kg/ha for genotype No.47. Genotypes No. 2, 42, 12, 22, 38 and 40 exhibited the highest average yields, with respective values of 2140, 2135, 2128, 2123 and 2122 kg/ha. Based on coefficient of variation (CV%), Shukla stability statistics and Rick, Lane and Binns equivalence and nonparametric S1(i) statistics, lines 40, 42, 12, 25 and 22 were identified as the most stable genotypes with high grain yield. These lines will be proposed for future extension trials.
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