Topcross analysis and combining ability for grain yield and other atributes in maize Zea mays l.
2010
Abd El-Azeem, M.E.M. | Abd El-Aal, A.M.M. | El-Galfy, A.M.K.
Nineteen selected S3 inbred lines families from white maize were topcrossed with each of the two the commercial inbred line testers, viz. Sd-34 and Gz-629. Forty entries (38 topcrosses and two white commercial single crosses checks; SC. 10 and SC. 129) were evaluated at for days to 50% silking, plant and ear heights, grain yield and grain yield per plant. Obtained data revealed that, mean squares due to crosses, lines, and testers were significant for all studied traits at both locations and over locations. Line x tester interaction was significant for all of the studied traits, except days to 50% silking and plant height at Sakha, and days to 50% silking at Sids. Highly significant differences were detected among locations for all of the studied traits, indicating that the two locations differed in their environmental conditions. In addition, Location x tester interaction was significant for all studied traits, except for ear height and grain yield per plant . The best GCA effects for grain yield were recorded for lines L-4, L-6, L-7, L-8, and L-9. However, L-10 and L-19 exhibited the highest GCA values for earliness, whereas, inbred lines 7 and 3 exhibited the highest GCA values for plant and ear height. These lines should be directly utilized in breeding program to develop high yielding hybrids. Results showed also that the cross L-9 x Sd-34 was the best positive and significant SCA effects for grain yield in ard/fed and per plant. The magnitude of O. GCA for lines was high for all studied traits, except for silking date at Sakha, silking date, plant height and ear height at Sids and the combined data. The interaction O. GCA x Loc for lines was higher than that of O. GCA x Loc for only plant height and ear height.
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Эту запись предоставил Ain Shams University