GENETIC ANALYSIS FOR GRAIN YIELD, DOWNY MILDEW, LATE WILT AND KERNEL ROT DISEASES ON MAIZE. | ||||
| Journal of Plant Production | ||||
| Article 1, Volume 27, Issue 4, April 2002, Page 1965-1975 PDF (4.24 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2002.253945 | ||||
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| Authors | ||||
| E. A. Amer,; H. E. Mosa; A. A. Metawei | ||||
| Maize Research Program, Field Crops Research Institute, A.R.C., Egypt. | ||||
| Abstract | ||||
| .Nine white inbred lines of maize were crossedin a diallel crossessystem . in ·2000 growing season. Inbred lines and F's sinqle crosses, 'i/hich evaluated in' three experiments at Sahka location in 2001 growing season .The first experiment was carried out under normal' condition for grain yield and late wilt disease. The second 'experiment - was under artificial infections for downy mildew' disease. The third experiment was in laboratory to determine the presence of kernel rot caused by Fusarium monititoime and Penicillium spp. Data were genetically analyzed by the procedures developed by Griffing (1956). Genotypes and their arthognals, parents (p), crosses (c) and P vs c mean squares reached the significant level of probability for all studied traits. except kernel rot diseases which caused by Fusarium moniliforme and Penicillium sop. for parents and crosses and kernels miosture for p vs c. The-mean squares associated with general GCA and specific SCA combining abilities were significant for all studied traits except GCA for Fusarium monilitorme and Penicillium sop. diseases. . . The 'ratio a2A I a20 showed greater important of dominance gene action in the inheritance of grain yield, silking date, Fusarium moniliforme and Penicillium spp. While additive gene action showed great importance in the inheritance of kernels moisture, downy mildew and late wilt resistance. The estimates of average degree of dominance indicated over dominance in all studied traits except kernels moisture and downy mildew resistance, which was partially dominant. The broad sense heritability est-mates were high for all studied traits except kernel rot diseases. Grain yield was negatively correlated with silking date and infection by Fusarium moniliforme and Penicillium spp .. while positively correlated with iate wilt resistance. ' The parental lines SK-4054, S062/E. SD34/E and SK6056 wer~ the best general combiners for grain yield. resistance of some maize diseases and earliness. The four crosses. i.e. S07/E x S034/E. SD34/E x SK-4054. SD34/E x SK-6056and S062/E x SK4054 had superiority in most studied traits. The above new hybrids could be use to improved the yieldrng ability and early maturity in maize breeding programs | ||||
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