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Journal Cover Journal of Plant Breeding and Genetics
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  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]
  • COMBINING ABILITY FOR YIELD AND RESISTANCE TO MIDGE STENODIPLOSIS
           SORGHICOLA (COQUILLETT) IN SORGHUM (SORGHUM BICOLOR (L.) MOENCH)

    • Authors: Hamidou Massaoudou, Malick Ba, Issoufou Kapran, Eric Y. Danquah, Kwadwo Ofori, Vernon Gracen
      Pages: 19 - 33
      Abstract: Sorghum plays an important role in both animals and humans feeding. However, sorghum midge is one of limiting factors in sorghum production. This study was conducted to estimate combining ability for grain yield, and resistance to sorghum midge. Two introduced cytoplasmic male sterile lines were crossed to 25 F5 inbred lines in line by tester design to produce 50 hybrids. The parents and F1 hybrids were evaluated in two different planting dates at a location considered to be a sorghum midge hot spot in Niger. Line by testers analysis was performed to estimate combining ability for yield and midge resistance as well as other sorghum traits among parental lines and the hybrids. The analysis of variance for combining ability shows that mean sum of square due to lines, testers and the interaction between lines and testers in both planting date was significant for most of the characters under study. Additive gene action was predominant for all traits in both planting dates. Non additive gene action was also predominant for plant height, days to 50% flowering, grain yield and resistance to midge. Based on GCA and SCA effects, some lines and hybrids have been identified with good yield potential and resistance to sorghum midge.
      PubDate: 2017-05-17
      Issue No: Vol. 4, No. 2 (2017)
       
  • GENETIC ANALYSES FOR YIELD AND YIELD CHARACTERS IMPROVEMENT IN AROMATIC
           AND NON-AROMATIC RICE (ORYZA SATIVA L.) OF SELECTED CROSSES FROM GENOTYPES
           FROM MOZAMBIQUE AND MALAWI UNDER IRRIGATION

    • Authors: Abdala J. Abdala
      Pages: 35 - 41
      Abstract: An experiment was laid out in a randomized complete block design (RCBD) with three replications at Lifuwu Rice research station, Salima district, Malawi during winter 2015/16 cropping season. Genetic analyses for yield and yield components were performed in selected hybrids derived from aromatic and non-aromatic rice (Orysa sativa L) crosses and their parental genotypes from Mozambique and Malawi.  The results revealed that the hybrids and their parents differed significantly (p<0.05) for all the traits studied except culm number, suggesting that conventional breeding program for yield and yield characters can start using these genotypes hence they constitute a pool of germplasm with adequate genetic variability. Genotypic coefficients of variation were lower than the corresponding phenotypic coefficients in all the characters. High broad sense heritability was found on vegetative vigour (0.70), plant height (0.70), 1000 grains weight (0.85) and grain yield (0.68) indicating that direct selection for yield and yield components improvement can be effectively performed using these traits. These results, indicate the potential for production of high grain yield recombinant inbreed lines and also the design of a breeding program that aims to study agronomic characters to improve the productivity of rice varieties in both Mozambique and Malawi.
      PubDate: 2017-05-17
      Issue No: Vol. 4, No. 2 (2017)
       
  • ASSESSMENT OF GENE ACTION BY LINE X TESTER MATING DESIGN IN SESAME
           (SESAMUM INDICUM L.) ELITE GENOTYPES

    • Authors: Walter Okello-Anyanga, Patrick Rubaihayo, Patrick Rubaihayo, Paul Gibson
      Pages: 43 - 53
      Abstract: Although sesame is self-pollinated, interest has recently been developed in producing hybrid varieties as a considerable amount of heterosis has been demonstrated in the crop. Successful yield improvement depends on the variability present among the different genotypes and in-depth understanding of the underlying gene action and genetic architecture of traits related to yield. Line x tester mating design was used to determine the combining ability and gene action of traits, and therefore an experiment involving nine females and five male parents was undertaken at the National Semi-Arid Resources Research Institute (NaSARRI) and Ngetta Zonal Agricultural Research and Development Institute (NgeZARDI), during 2013 growing seasons to assess the combining ability and gene action of various traits. Results showed that mean squares across locations had high significant difference for all the traits recorded indicating that locations had effect on those traits. Variances for the males were higher than the variances for the females for all the traits except capsule width suggesting greater variability among the males than the females. Combined general combining ability (GCA) across locations showed that GCA for the lines and testers were significantly positive for a few traits. Specific combining ability (SCA) was only positively significant for days to flowering, number of capsules on branches, number of capsules on main stem, total number of capsules and capsule length. Baker’s ratio was high for most of the characters and medium for plant height, number of capsules on branches, number of capsules on main stem and capsule length. Coefficients of determination for narrow sense heritability (CDnsh) were high for days to flowering, height of first branch and height of first capsule. Among the lines, Sesim 2, Ajimo A1-5, EM15-1-5, Ajimo A1-6//7029, Local 158//6022 and (Y-1//Local 158)-1-2-1 and among testers 4036-1-10-2 and SPS1438-1-6-4 were desirable for different traits.
      PubDate: 2017-05-17
      Issue No: Vol. 4, No. 2 (2017)
       
 
 
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