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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 89 (1994), S. 112-115 
    ISSN: 1432-2242
    Keywords: Interspecific hybridization Pennisetum glaucum ; Pennisetum purpureum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Correlation and path-coefficient analyses have been successful tools in developing selection criteria. Since increased seed yield is an important goal in our pearl millet x elephantgrass [Pennisetum glaucum (L.) R.Br. x P. purpureum Schum.] hexaploid breeding program, we used correlation and path-coefficient analyses on seed data. This study was conducted to develop appropriate selection criteria by determining the direct and indirect effects of seed-yield components on seed yield plant-1. Number of tillers plant-1, panicles tiller-1, seeds panicle-1, 100-seed weight, and seed yield plant-1, were estimated for individual plants in seven families. Phenotypic (rp) and genetic correlations (rg) were calculated, and path analyses (phenotypic and genetic) were carried out according to predetermined causal relationships. Phenotypic and genetic correlations differed in several cases due to large environmental variance and covariance. Phenotypically, all components were positively and significantly associated with seed yield plant-1. Genotypically, only seeds panicle-1 and 100-seed weight were significantly correlated. These two components were also positively correlated (r p=0.55, r g=0.63), so simultaneous improvement for both components would be feasible. Panicles tiller-1 and seeds panicle-1 were negatively correlated (r g=-0.97). In the path analyses, all direct effects of the components on seed yield plant-1 were positive. Phenotypic indirect effects were not as important as genetic indirect effects. The components seeds panicle-1 and 100-seed weight influenced seed yield plant-1 the greatest, both directly and indirectly.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 67 (1993), S. 143-149 
    ISSN: 1573-5060
    Keywords: elephantgrass ; interspecific hybrid ; hexaploid ; pearl millet ; Pennisetum purpureum ; Pennisetum glaucum ; seed
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Successful widespread use of a forage or biomass plant depends largely on its ease of establishment. Elephantgrass (Pennisetum purpureum Schum.) is used for both forage and biomass production, due to its high dry matter production, aggressiveness, perenniality, and forage quality. However, lack of high quality seed has limited the use of elephantgrass and its hybrids to pearl millet (P. glaucum L. R.Br.). Development of a seed-propagated pearl millet x elephantgrass hexaploid cultivar, which would combine desirable characteristics from both of these species, would be highly desirable. The objectives of this study were to characterize morphological and seed-related traits from the selfed progeny of seven hexaploid hybrids, and to determine whether seed size had any influence on these traits. Traits studied included number of tillers, height, leaf length and width, panicles per plant, days to flowering, panicle length, seed set, seed production, and weight of 100 seeds. Genetic differences were found among the progeny of the seven hybrids. Differences were also found between plants derived from large- and small-seed lots within families. Plants descended from larger seed had better growth and seed-related characteristics, which resulted in more desirable plants. These hexaploid hybrids showed potential for direct seeding into the field for biomass or forage production.
    Type of Medium: Electronic Resource
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