FORMING A NEW MAIZE SYNTHETIC VARIETY AND INPROVEMENT BY USING S1 LINE PER SE SELECTION. | ||||
| Journal of Plant Production | ||||
| Article 6, Volume 28, Issue 2, February 2003, Page 791-798 PDF (8.12 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2003.242242 | ||||
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| Authors | ||||
| E. A. Amer,; H. E. Mosa; A. A. Motawei | ||||
| Maize Res. Sec .• Field Crop Res. Inst., Sakha Agric. Res. Station. | ||||
| Abstract | ||||
| This investigation was conducted at Sakha Research Stalion from 1997 through 2002 growing seasons. White synthetic variety Sakha-6. as a new maize variety, was used in this sludy to utilize its genetic variability in improving yielding potentiality via 81 lines per se. A lotal of 20081 families from Sakha·6 were tested during the 2001 season in two separate experiments under low and high N doses (i.e .. 70 a~d 120 Kg N/faddan. respectively). Differences between the two nitrogen levels were not significant for alf traits except grain yield and ear diameter. However, the means were higher under the high nitrogen level for all traits except reststaoce to late wilt disease and silking date. Genetic variance was significant for all traits at each of Ihe two nitrogen levels and from both levels. while. the interaction between genetic variance and variance due to nitrogen levels was not significant for afltraits except resistance to late wilt disease. Phenotypic and genotypiC variances were increased under the high nitrogen level for grain yield. resistance to late will disease and ear height. But, they were increased under low nitrogen level for number of ears I plant ,ear length ,ear diameter and silking date. Heritability was higher under the high nitrogen level for all trails except number of ears/plant and silking date.The higher values over Ihe two nitrogen levels were obtained for silking date (89.20%) and grain yield (85.10%). The expected gain from selection was higher under low nitrogen level for all traits except resistance to late wilt disease and plant and ear height. The expected gain from selection showed that 51 families selection would be effective for increasing Ihe grain yield (28.10%) in eyele-t (or the new synthetic variety Sakha-6. Correlation coefficients between all studied traits with grain yield were significant, indicating that the indirect selection for linked traits with yield would be useful and effective for improving grain yield. | ||||
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