Abd EI-Aty,, M., Katta, Y. (2002). ESTIMATION OF HETEROSIS AND COMBINING ABILITY FOR YIELD AND OTHER AGRONOMIC TRAITS IN MAIZE HYBRIDS (ZEA MA YS L.). Journal of Plant Production, 27(8), 5137-5146. doi: 10.21608/jpp.2002.256222
M. S. Abd EI-Aty,; Y. S. Katta. "ESTIMATION OF HETEROSIS AND COMBINING ABILITY FOR YIELD AND OTHER AGRONOMIC TRAITS IN MAIZE HYBRIDS (ZEA MA YS L.)". Journal of Plant Production, 27, 8, 2002, 5137-5146. doi: 10.21608/jpp.2002.256222
Abd EI-Aty,, M., Katta, Y. (2002). 'ESTIMATION OF HETEROSIS AND COMBINING ABILITY FOR YIELD AND OTHER AGRONOMIC TRAITS IN MAIZE HYBRIDS (ZEA MA YS L.)', Journal of Plant Production, 27(8), pp. 5137-5146. doi: 10.21608/jpp.2002.256222
Abd EI-Aty,, M., Katta, Y. ESTIMATION OF HETEROSIS AND COMBINING ABILITY FOR YIELD AND OTHER AGRONOMIC TRAITS IN MAIZE HYBRIDS (ZEA MA YS L.). Journal of Plant Production, 2002; 27(8): 5137-5146. doi: 10.21608/jpp.2002.256222
ESTIMATION OF HETEROSIS AND COMBINING ABILITY FOR YIELD AND OTHER AGRONOMIC TRAITS IN MAIZE HYBRIDS (ZEA MA YS L.)
Agronomy Department, Fac. of Agrlc., Tanta University Egypt.
Abstract
This investigation aimed to study the type of gene action and heterotic effects in maize. Seven parental single crosses and their resulted 21 diallel double crosses (derived In 2000 season) were tested on a field experiment in the Experimental Farm, Faculty 01 Agriculture, Kalr EI·Sheikh, Tanta University during the season 2001 in a randomized complete blocks design with three replications. The studied traits were silking date, plant and ear heights, ear length, ear diameter, number of rows/ear, number of kemels/row, 100-grain weight and grain yield ardablfed. The results showed that:
1- Highly significant differences were obtained among the studied genotypes (parental crosses and single vs. double crosses). General and specific combining ability mean squares were highly significant for all studied traits, except plant height for specific combinlng ability.
2- Non-additive gene effects played a major role in the inheritance of all studied characters except for ear length and ear diameter where the additive gene effects played the Important role.
3- Single crosses 10 and 129 showed the best general combining ability effect for grain yield and most agronomic traits, while those for days to 50% silking with short plants were obtained by single crosses 120 and 124.
4- Highest values of specific combing ability effects for grain yield were obtained from the double cross (9 x 10). While nine double crosses exhibited negative and significant specific combining ability effects toward ear1iness.
5- Heterosis values as a percentage relative to the mid and high parent ranged from negative to positive significant values for all studied traits. The highest heterosis value for grain yield ard.lfed. was obtained from the double cross (9 x 10) only.
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