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Articles by Mandefro Nigussie
Total Records ( 3 ) for Mandefro Nigussie
  Mandefro Nigussie and Ghizan Saleh
  In the present study, two cycles of Mass Selection (MS) and Selfed Progeny Selection (SPS) were conducted on two sweet corn populations (BC2-10 and BC1-10 x Syn-II). The improved populations generated from each of the two populations were evaluated in comparison with the base populations, at two locations, to determine the genetic gains, to estimate heritability and correlations among traits measured. The two base populations showed varied average realized responses to MS and SPS. In BC2-10 derived populations, the realized responses to MS were 5.1% in cycle 1 (C1) and 4.8% in cycle 2 (C2), whereas, the realized responses to SPS were 9.1% in C1 and 1.2% in C2. In BC1-10 x Syn-II derived populations, the realized responses to MS were 5.5% in C1 and 2.9% in C2, while the realized responses to SPS were 5.6% in C1 and 2.9% in C2. The two selection methods were equally effective in improving the populations for ear length, except in C1 of BC2-10, where SPS was more effective than MS. Both selection methods were also effective in increasing fresh ear yield and number of kernels per row. Response of other correlated traits depended on selection methods used and populations under selection. The improved populations generated could serve as better germplasm sources to develop vigorous inbred lines and open pollinated varieties and further selection in these populations could offer better responses.
  Mandefro Nigussie and Ghizan Saleh
  The objectives of this study were to determine the genetic variability (σ2G) and thereby estimate the genetic gain after two cycles of selection within two sweet corn source populations, BC1-10xSyn-II and BC2-10. Selfed progenies from each of the two source populations were evaluated following the recommended cultural practices. As the progenies derived from the two source populations had sufficient genetic variability for most traits, two cycles of mass selection (MS) and selfed progeny selection (SPS) were conducted on the two sweet corn populations (BC2-10 and BC1-10xSyn-II). The two base populations showed varied average realized responses to MS and SPS. In BC2-10 derived populations, the realized responses to MS were 5.1% in cycle 1 (C1) and 4.8% in Cycle 2 (C2), whereas the realized responses to SPS were 9.1% in C1 and 1.2% in C2. In BC1-10xSyn-II derived populations, the realized responses to MS were 5.5% in C1 and 2.9% in C2, while the realized responses to SPS were 5.6% in C1 and 2.9% in C2. The two selection methods were equally effective in improving the populations for ear length, except in C1 of BC2-10, where SPS was more effective than MS. Both selection methods were also effective in increasing fresh ear yield and number of kernels per row. Response of other correlated traits depended on selection methods used and populations under selection. The improved populations generated could serve as better germplasm sources and further selection in these populations could offer better responses.
  Solomon Admassu , Mandefro Nigussie and Habtamu Zelleke
  Fifteen maize genotypes were tested at nine different locations in 2005 under rainfed condition to determine stable maize genotypes for grain yield and determine genotypes with high yield and form homogenous grouping of environments and genotypes. The experiment was conducted using Randomized Complete Block Design with three replications. There was considerable variation among genotypes and environments for grain yield. Stability was estimated using the Additive Main Effects and Multiplicative Interactions (AMMI). Based on the stability analysis, genotypes 30H83, BH-540, Ambo Synth-1, AMH-800 and BHQP-543 were found to be stable for grain yield. The first two Interaction Principal Component axis (IPCA1 and IPCA2) were significant (p<0.01) and cumulatively contributed 70.27% of the total genotype by environment interaction. The coefficient of determination (R2) for genotypes 30H83 was as high as 0.92, confirming its high predictability to stability. Among the genotypes, the highest grain yield was obtained from genotype 30H83 and BH-541 (8.98 and 8.05 t ha-1) across environments. Clustering of AMMI-estimate values grouped genotypes in to four clusters and the environment in to three clusters. Environment Goffa was unique as it is grouped differently from all other environments.
 
 
 
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