Variation, correlation and path coefficient analyses in seed yield and related characters in local accessions of African Yam Bean (Sphenostylis stenocarpa) from Southern Nigeria

Osuagwu, A. N.; Chukwurah, Peter Nkachukwu; Ekpo, I. A.; Akpakpan, Emem E.; Agbor, R. B.

doi:10.5897/ajar2012.6637

Cited by 3 publications

References 7 publications

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Germplasm Collection and Genetic Diversity Characterization of Squash (Cucurbita Moschata Duchesne Ex Lam) Based on Multivariate Analysis of Quantitative and Qualttative Attributes

Osuagwu,

Ubi,

Ikong

2024

Preprint

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This research was focused on the evaluation of agro-morphological attributes of twenty-four accessions of Squash, Cucurbita moschata obtained from Abia, Benue, Cross River Ebonyi, Edo and Enugu States. Plant length, internode length, petiole length, fruit length, fruit diameter, fruit weight, flesh thickness, mature seed number, aborted seed number, leaf area, flower number and leaf number were evaluated. Data generated from the study for growth and yield attributes were analyzed using PAST 3 software for analysis of Variance, Principal Components Analysis, Correlation Coefficient Analysis and genetic distances-based similarity indices of the accessions. The results indicated that there were significant differences (P < 0.05) among the accessions in most of the growth and yield attributes evaluated. The best performing accessions were Abia creamy and Abia brown varieties which showed high performances in all growth and yield parameters evaluated. The Enugu 4 accession showed the least performance in most of the growth and yield attributes evaluated. Results of the variation in growth traits showed significant difference in all the growth attributes except stalk length. Also there was significant variation (P < 0.05) in yield attributes. Results of the Principal Components Analysis of the growth parameters showed that flower number, aborted seed number, fruit length, leaf number, fruit texture, flesh texture, flesh colour and secondary colour contributed to the total variation. Results of Correlation Analysis between quantitative and qualitative attributes showed that mature seeds correlated positively, strongly and significantly with fruit colour, flesh colour, flesh texture and colour pattern. Fruit diameter was found to be positively, strongly and significantly correlated with fruit texture, flesh texture, colour pattern, predominant colour and secondary colour. The hierarchical numeric cluster analysis classified the quantitative and qualitative traits in the 24 accessions into 2 major clusters with most of the accessions having similar quantitative attributes in cluster one and those accessions with similar qualitative traits in cluster two. It was concluded that Abia creamy and Abia brown were the most adaptable varieties from the results due to their high performances in all growth and yield parameters evaluated and thus recommended for farmers in this Agro-ecology of Calabar. Moreso, Abia creamy and Abia brown which showed high relatedness and performances can be used to improve Enugu brown with low performance by cross breeding to enhance performance for food security.

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Germplasm Collection and Genetic Diversity Characterization of Squash (Cucurbita Moschata Duchesne Ex Lam) Based on Multivariate Analysis of Quantitative and Qualttative Attributes

Osuagwu,

Ubi,

Ikong

2024

Preprint

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Assessing Intraspecific Variability and Diversity in African Yam Bean Landraces Using Agronomic Traits

et al. 2022

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Landraces are repositories for potential beneficial traits which could be used to develop varieties with enhanced qualities. Optimal utilization of the available large collection of landraces of African yam bean (AYB) presently conserved at the Genetic Resource Center, International Institute of Tropical Agriculture, Ibadan (GRC-IITA), requires an assessment of the magnitude and nature of genetic diversity within the germplasm. One hundred and ninety-six AYB accessions were evaluated during the 2018 and 2019 cropping seasons in three agro-ecologies of Nigeria, using a 14 × 14 triple lattice design. The accessions were assessed for fourteen agronomic traits. Accession, environment, and accession × environment interaction effects were significant (p < 0.05) for all the traits. Variances due to environment and accession × environment interaction were higher than the genotypic variances. Similarly, estimates of phenotypic coefficient of variation (PCV) were higher than genotypic coefficient of variation (GCV) for all traits. Broad-sense heritability ranged from 17.1% (days to maturity) to 66.4% (seed length). Seed yield per plant had positive significant genotypic correlation with all the studied traits, except pod length and seed length. The first three principal components accounted for 59.7% of the total variation among the accessions and comprised of the 14 traits. Five major clusters were delineated based on phenotypic characteristics. Genetic variation was present among the AYB accessions, and these results will be useful for setting breeding goals and conservation approaches.

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Genetic variability of yam based on quantitative descriptors

Cossa¹,

Cerqueira-Pereira²,

Almeida³

et al. 2019

Afr. J. Agric. Res.

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Yam is a promising income source for small producers in the Recôncavo Baiano region. However, few genetic studies have been conducted with this culture. In this sense, the aim of this study was to assess genetic variability among 89 genotypes of yam (Dioscorea rotundata Poir.) collected in four municipalities in Bahia State, Brazil. These were assessed based on eight quantitative descriptors. Data were subjected to descriptive statistics, Spearman's rank correlation, Singh criterion, cluster analysis, principal component analysis and dispersion graph. The tuber weight showed the highest coefficient of variation and correlated positively and significantly with width and length of tuber. The tuber length characteristics contributed most to the genetic divergence. The criterion pseudo-t 2 divided 89 genotypes into seven groups, being that groups 4, 5 and 7 showed the highest averages for the production characteristics. The first three principal components explained 69.49% variation and dispersion graph showed partly concordant with UPGMA method. This study revealed the existence of genetic variability of yam, which may be explored in future genetic improvement programs.

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Variation, correlation and path coefficient analyses in seed yield and related characters in local accessions of African Yam Bean (Sphenostylis stenocarpa) from Southern Nigeria

Cited by 3 publications

References 7 publications

Germplasm Collection and Genetic Diversity Characterization of Squash (Cucurbita Moschata Duchesne Ex Lam) Based on Multivariate Analysis of Quantitative and Qualttative Attributes

Germplasm Collection and Genetic Diversity Characterization of Squash (Cucurbita Moschata Duchesne Ex Lam) Based on Multivariate Analysis of Quantitative and Qualttative Attributes

Assessing Intraspecific Variability and Diversity in African Yam Bean Landraces Using Agronomic Traits

Genetic variability of yam based on quantitative descriptors

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