Crop Protection & Environmental Biology

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Subject: search.filters.subject.Fibre yield

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    Combining ability and heterosis for fibre yield traits in Nigeria kenaf (Hibiscus cannabinus L.) Collections
    (The Genetics Society of Nigeria, 2014) Akisanya, A. O.; Balogun, M. O.
    Kenafas a renewable fibre crop is known to yield lower in Nigeria than in other countries of the world. An experiment was conducted at the University of Ibadan, Oyo State, Nigeria, where sixteen (16) crosses were made among four (4) Nigeria kenaf (Hibicuscannabinus) accessions to investigate the combining ability and heterosis for fibre yield traits in the hybrids. The parents and progenies were planted in three replicates in a randomized complete block design. Data were collected on plant height, stem diameter and girth at flowering and at harvest, as well as stalk weight at harvest and means separated at P=0.05. Results showed no significant differences among genotypes at flowering and for stalk weight at harvest. Higher general combining ability (GCA) over specific combining ability (SCA) was recorded for all characters at harvest. Only accession NHC 10(1) had a positive GCA for height at harvest (21.84) and girth at harvest (1.09). The highest SCA effects were recorded in cross NHC 10(1) X NHC 2(2) for all measured traits. In contrast, the highest positive mid-parentheterosis (28.02%) was obtained in the reciprocal cross NHC 15 X NHC 10(1)followed by NHC 2(2) X NHC 10(1) (25.76%) for HAH. Both crosses had parent NHC 10(1) to be one of their respective parents. Thus, this study identified hybrids NHC 15 X NHC 10(1) and NHC 2(2) XNHC 10(1) as promising for improvement of fibre yield traits. However, performances of these hybrids need to be evaluated in multi-locational and on-farm trials prior to commercial use.
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    Evaluation of photoperiod sensitivity and adaptation in Kenaf (Hibiscus cannabinus) in some Nigerian agro-ecologies
    (Elsevier, 2012) Balogun, M. O.; Akande, S. R.; Raji, J. A.; Ogunbodede, B. A.
    Seven genotypes of Kenaf were grown in pots at controlled and natural photoperiod (PP) regimes in Ibadan, South-western Nigeria, to determine their PP sensitivities. Numbers of days to flowering and fibre yield were recorded. The same genotypes were grown on the field at Jos, Ibadan and Badeggi of high altitude, southern guinea savannah and forest agro-ecologies of Nigeria, respectively. Days to flowering, fibre and seed yields were recorded. Potted plants grown at natural PP flowered earliest, 54 days after planting (DAP) while they flowered at 118 DAP at 12 hours PP. IFEKEN DI400flowered 20 days later than other genotypes at both PP regimes, and was grouped as being relatively photo- insensitive. Fibre yield was significantly higher at natural than at 12 hours PP only in IFEKEN DI400, with highest mean yield of24.08g / plant. In the genotype x environment studies, IFEKEN DI400 was consistently latest to flower across locations with an average of 107 days. Mean fibre yield of 11,314.5kg/ha in Ibadan tripled that obtained in Badeggi and Jos. Genotype Tainung had the highest seed yield of 473.75g and 179.35g at Badeggi and Ibadan, respectively while the lowest seed yield 201.08g for Jos was recorded in genotype 8B. Badeggi is recommended for seed production while Ibadan is recommended for fibre production pending the availability of specifically adapted genotypes. The genotypes IFEKEN DI400, Tainung and 8B are candidate genotypes in breeding for high yield and adaptation to Nigerian agro-ecologies.
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    Morphological diversity of 51 kenaf accessions in Nigeria
    (Universidad de Oriente Press, 2008) Balogun, M. O.; Raji, J. A.; Akande, S. R.
    Fifty-one accessions of Hibiscus cannabinus L. were evaluated for 14 morphological parameters in Ibadan, southwestern Nigeria. The correlation matrix of the quantitative parameters was used to perform principal components (PC) analysis to understand the relative contributions of each trait to the variation observed, while Fastclus procedure was used to cluster the accession into five groups. The most widely varied traits were earliness, number of apical branches and leaf lobes per plant with 483.3, 97.9 and 60.6% coefficients of variation respectively. Correlation between fibre yield parameters and earliness was negative and significant. The first three PCs explained 66.23% of the variation, with only number of apical branches not highly weighted by any of the PC. The five clusters were distinguished by earliness, plant height, fibre yield, stem spine density, stem girth and apical branching. The variation was seen as a manifestation of environmental response in addition to the genotypic constitution. These results will aid in parent selection during breeding programmes.