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GENETIC STUDIES ON ECONOMIC CHARACTERS IN SOME INTERVARIETAL COTTON CROSSES. | ||
| The Iraqi Journal of Agricultural Science | ||
| Article 1, Volume 40, Issue 1, 2009, Pages 38-55 | ||
| Authors | ||
| Abdul Gillil Ibrahim Al-Marsoomi; Dawood Salaman Madab AL- Obaidy | ||
| Abstract | ||
| A field experiment comparison was carried out during 2004 for six population (P1, P2, F1, F2, BC1 and BC2) by using a randomized completely block design with three replications to study genetic parameters in some intervarietal cotton crosses. Both methods for estimating gene effects (weighted least square of joint scaling test and weighted least square of digenic interaction) revealed significant positive additive effects in plant height for Marsoomi 4 X Lashata, Marsoomi 4XW888 crosses, seed and lint cotton yield for the first cross, seed index for Marsoomi 4 X Lashata and Coker 310 X Packot 189 crosses. In addition to lint index in the last cross, while dominance effects were important by using first method of estimating gene effects. Significant positive additive X additive gene effects appeared in seed cotton yield for Lashata X Marsoomi 4 cross associated with a large proportion of additive variance, while additive X dominance, dominance X dominance gene effects were exist in yield and it's components in other crosses. High ratio of genetic advance (14.87-40.49%) and hybrid vigour of cotton yield may be resulted from additive, dominance, co- dominance and other epistatic effects, besides superiority in growth traits. Therefore, we suggest to continue breeding program to select good segregates of these crosses. | ||
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