بررسی ارتباط برخی از صفات زراعی و مورفولوژیکی با عملکرد در لاین های نسل هفتم سویای حاصل از پرتو دهی با اشعه گاما

thirty-three M7 soybean mutant lines which originated by γ ray (co-60) from cultivar L17 irradiated with doses150, 200 and 250 Gray (absorbed dose), L17 cultivar and two commercial cultivars Clark (CL) and Williams (WI) were evaluated in view of some agronomical and morphological traits under completely randomized design with three replications. In M7 mutant lines all traits except number of seed per pod showed a significant difference at α=1% or 5% in comparison with L17 and commercial cultivars. The difference of seed per pod was not significant amongst studied lines. Seed yield per plant showed positive and highest correlation (0.886) with harvest index. Stepwise regression analysis showed 99.7% variation of yield per plant as a depended variable justified with harvest index and plant dry weight traits that harvest index value were more than plant dry weight. By using forward regression analysis except two mentioned traits other traits with low importance including number of leaf per plant, plant height and root dry weight were inserted in final regression model. Path analysis results showed that harvest index and plant height have respectively highest (0.62) and lowest (0.001) positive direct effects on seed yield per plant. Therefore harvest index trait can be used as relevant selection criteria for yield in plant breeding programs. By using of principal factor analysis with varimax rotation for studied traits, 6 factors were determined that these factors justified 89% of total variation. First factor justified 35% of total variation and this factor called as a yield factor.