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Journal Cover Journal of Plant Breeding and Genetics
  [10 followers]  Follow
  This is an Open Access Journal Open Access journal
   ISSN (Print) 2308-121X - ISSN (Online) 2305-297X
   Published by eSci Journals Publishing Homepage  [8 journals]

    • Authors: Tadesse Yohannes, Mussie Weldetsion, Negusse Abraha, Eric Manyasa, Tesfamichael Abraha
      Pages: 01 - 08
      Abstract: Thirteen progenies of sorghum (Sorghum bicolor L. Moench) crosses (Amal and ICSV 91078) that selected using pedigree breeding method, were evaluated along with their parental checks to obtain information on yield potential, earliness, genetic and morphological diversity. The genotypes were evaluated in randomized block design with three replications for three years (2007-2009) at Halhale research center. Significant mean squares were obtained for almost all characters in the individual analysis of variance as well as the combined analysis across seasons, suggesting that, these sorghum genotypes were highly variable for almost all the characters studied, therefore, would respond to selection. Mean values for the combined analysis of the progenies showed that Hal-1-1, Hal-4-9, Hal-13-33, Hal-11-30 and Hal-9-24 were promising cultivars in terms of grain yield and earliness. Combined analyses also showed most characters had relatively higher genotypic and phenotypic variance components and little difference between  phenotypic coefficient of variation (PCV) and genotypic coefficient of variation (GCV) indicating their variation has a genetic origin that can be exploited for further breeding programs. The genotypes also exhibited varying degrees of heritability estimates. Characters such as plant height, days to 50 % flowering and grain yield responded positively to selection because of high broad sense heritability estimates. High heritability and genetic advance was noted for plant height and days to 50% flowering indicating that these parameters were under additive gene effect and responded well for genetic improvement. However, grain weight showed high heritability with low genetic advance indicating that the trait has non additive gene action and might respond well due to its heterosis.
      PubDate: 2016-01-31
      Issue No: Vol. 1, No. 1 (2016)
           (AMMI) MODEL

    • Authors: Fayeun L. Stephen
      Pages: 09 - 16
      Abstract: This study was conducted to determine the yield stability and to analyse the Genotype by Environment Interaction (GEI) of twenty five genotypes of fluted pumpkin genotypes. The experiment was laid out in a randomized complete block design (RCBD) with three replications under four environments using Additive Main effects and Multiplicative Interaction (AMMI) analysis. The mean squares of the analysis of variance revealed significant genotype, environment and GEI on marketable leaf yield per plant. AMMI analysis revealed that the major contributions to treatment sum of squares were environments (3.24%), GEI (46.90%) and genotypes (49.70%), respectively, suggesting that the marketable leaf yield of the genotypes were under the major genotypic effects of GEI. The first two principal component axes (PCA 1 and 2) cumulatively contributed 93.50% of the total GEI and were significant (p ≤ 0.01). The biplot accounted for 85.82% of the total variation. The AMMI model identified genotypes Ftn44, Ftk20, and Fts34 as most stable, while Fta39 with highest yield (398.80g/plant) had the largest negative interaction. The best genotype with respect to Abeokuta location was Ftw21 while Fta39 was the best for Akure area. Therefore, these genotypes can be recommended according to their specific adaptation areas. Abeokuta in the 2012 and 2013 had positive interaction values of 14.38 and 9.46 respectively whereas Akure in 2012 and 2013 recorded negative interaction values of -5.03 and -18.81 respectively. Akure 2013 was the most discriminating environment and had the highest mean yield thus it is considered as a very good environment for cultivation of fluted pumpkin for marketable leaf yield.
      PubDate: 2016-01-31
      Issue No: Vol. 1, No. 1 (2016)

    • Authors: Chukwu S. Chibuike, Emmanuel O. Okporie, Lynda G. Ekwu, Godwin C. Onyishi, Andrew C. Nwogbaga
      Pages: 17 - 23
      Abstract: The study was aimed at sourcing and characterizing genotypes from different parts of Ebonyi State for use in future maize breeding. Therefore, conscious expeditions were made to the old 13 local government areas (LGAs) of Ebonyi State (Abakaliki, Afikpo North, Afikpo South, Ebonyi, Ezza North, Ezza South, Ikwo, Ishielu, Ivo, Ohaozara, Ohaukwu and Onicha). In each LGA, at least two cobs of each maize genotype were collected from their local market. A total of 26 local maize cultivars were collected. The maize genotypes collected from the 13 local councils were characterized based on location, seed colour, seed type, cob length, cob circumference, number of rows per cob, number of seeds per row, 100 seed weight (g) at 15.5% moisture content, kernel density (g/cm3) at 15.5% moisture content. After characterization, equal quantities of the samples were made from the 26 genotypes and taken to the laboratory for chemical analyses of nutritional contents such as percentage crude protein, oil, amylose and amylopectin. Results obtained showed that Ishiotu I and II both from Afikpo North had the longest cob length, cob circumference and number rows per cob. Ikwo yellow had the highest 100 seed weight and there is no doubt that this would result to higher grain yield. Significant and positive correlation were found between cob circumference and number of rows per cob (r = 0.526**). Number of seeds per row were also found to be significantly and positively correlated with cob length (r = 0.634**) and cob circumference (r = 0.458*). Kernel density was found to be significantly and positively correlated with amylose (r = 0.465*). It was also discovered that amylose had significant and negative correlation with amylopectin (r = -0.995**). Protein correlated positively with oil (r = 0.133), but was not significant. However, Ikwo yellow recorded the highest protein content of 8.06%. The low protein content in some other genotypes presents a great challenge to plant breeders in form of quality improvement. It was therefore concluded that maize genotypes for any breeding and/or improvement for agronomic and quality traits should necessarily include samples from Afikpo North and Ikwo LGAs of Ebonyi State. Also, these areas should be considered for both extensive and intensive cultivation of maize in furtherance of the present administration’s transformation agenda on agriculture.
      PubDate: 2016-01-31
      Issue No: Vol. 1, No. 1 (2016)
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