Nassr ,, M., El-Absawy, E., Gulrqis, A. (2005). GENETIC DIVERGENCE IN COMBINING ABILITY AND MAIZE HYBRIDS. Journal of Plant Production, 30(7), 3787-3807. doi: 10.21608/jpp.2005.237422
M. E. Nassr ,; E. A. El-Absawy; A. A. Gulrqis. "GENETIC DIVERGENCE IN COMBINING ABILITY AND MAIZE HYBRIDS". Journal of Plant Production, 30, 7, 2005, 3787-3807. doi: 10.21608/jpp.2005.237422
Nassr ,, M., El-Absawy, E., Gulrqis, A. (2005). 'GENETIC DIVERGENCE IN COMBINING ABILITY AND MAIZE HYBRIDS', Journal of Plant Production, 30(7), pp. 3787-3807. doi: 10.21608/jpp.2005.237422
Nassr ,, M., El-Absawy, E., Gulrqis, A. GENETIC DIVERGENCE IN COMBINING ABILITY AND MAIZE HYBRIDS. Journal of Plant Production, 2005; 30(7): 3787-3807. doi: 10.21608/jpp.2005.237422
GENETIC DIVERGENCE IN COMBINING ABILITY AND MAIZE HYBRIDS
1MolecuJar Biology. Dept., Genetic Engineering and Biotechnology Research Institute, Mi,nufiya University.
2Bloinforrnatics Dept., Genetic Engineering and Biotechnology Research Institute, Mtnufiya Unlversity.
Abstract
To estimate the genetic parameters for a local maize population (Zea mays L.J. Halt diallel cross mating design was used. The data showed the best crosses (M1 OxM 11) and (M11 xM 18) for grain yield /plot: and (M10xM12) tor plant height and days to tasseling; (M11xM16) for too-kernet weight; (M15xM18) for number of rows/ear, number of kernels/row and 100·kernel weight; (M12xM16), (M13xM15) and (M 14xM 18) for plant height (towards shortness) and ear height (towards low ear placement); and the cross (M16xM18) for days to tasseling towards earliness and grain yield/plot. Generally, most studied traits showed significant differences for G.C.A mean squares except, number of rows/ear and plant height at the two years and combined data. Highly significant specific combining ability (S.C.A) mean squares, were found for most studied traits. For crosses x years interaction mean squares show highly significant differences for most studied traits wer,::; found. while for number ot rows/ear. plant height. and days to tasseling non- significant differences were observed For G.C.A x years mean squares the dat.l showed divided between the seven traits under study. For S.C.A x years -nean squares, highly sig,!1ificant differences for most studied traits were foun.j ";'re ratio between K2G.C.A / K'S.C.A. was found to be less than unity at the comr-r.ed data for most studied traits except for days to tasseling indicating that. the uommance genetic variance controlled the .behavior of most studied traits rathr-: .ian the additive ones. Generally the best inbred line was M 18 for ear diameter a: the two growing years and the combined data. for lCO-kernel.weight at the second year and combined data, and ptant height (toward shortness) at the first year and combined data. The best crosses were (M11xM16) for 100-kernRI·weight (M13xM1S) for ear height (towards low ear placement) at the two years and combined data. The percentages of economic heterosis of F I hybrids relative to the check variety (S.c155) were ranged from (1.60% to 33.66%) positive desirable values and from (·5.78%) to (-6.40%) negative desirable values at combined data. Heterosis could not be considered as a function of genetic divergence. Moreover. genetic distance based on morpho-agronomical markers was not significantly correlated with specific combining ability, heterosis and the mean performance. Hence, it is impossible to predict the hybrid performance from genetiC distance itself.
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