Combining availability for quality of maize flour in A 6-Parent dialled cross

No Abstract

Multivariate analysis of pollination and seed characters in Hevea brasiliensis (Muell.Arg.)

No Abstract.Nigerian Journal of Genetics Vol. 16&17 2002: pp. 28-3

Correlation and Path Coefficients of Seed and Juvenile Characters with Respect to Latex Yield in Hevea brasiliensis Muell. Arg

Ten Hevea clones were evaluated for direct and indirect effects of sixteen seed and juvenile characters on latex yield. Each clone was evaluated for five juvenile characters, eleven seed characters and latex yield. Genotypic variance and correlation were obtained through analysis of variance and covariance respectively. Phenotypic correlation was calculated as simple correlation of clonal means. The phenotypic correlation of each seed and juvenile character with latex yield was partitioned into direct and indirect effects through path analysis. The most reliable character for indirect selection for latex yield was ratio of seed length/width, which had relatively high direct effect and significant phenotypic and genotypic correlation with latex yield. This relationship had the stabilizing influence of ratios of seed/shell weight and seed weight/volume. The pattern of use of effect coefficients for simultaneous improvement of latex yield and associated characters is provided

Performance of Cowpea (Vigna unguiculata [l.] Walp.) Genotypes as Measured by Genetic Parameters

This research study was performed with thirty-six cowpea genotypes to determine their performance for yield and yield related attributes in two pooled locations in a randomized system accross three replicates. Measurement of their different genetic parameters indicated high values of genetic variances for grain yield (390107) and plant height (37.96). High values for genotypic coefficient of variation, heritability and genetic advance were great for grain yield, pod weight and LAI characters, thus exhibiting the possibility of effective selection. The wide genetic variability observed in the cowpea genotypes could be exploited through improvement programs. Keywords: Cowpea, heritability, genotypic coefficient of variation, grain yield, plant heigh

Clonal stability of latex yield in eleven clones of Hevea brasiliensis Muell. Arg.

Eleven Hevea brasiliensis clones were evaluated for clonal stability of latex yield. A randomized complete block design was used with four replicates, two locations, seven years and three periods per year. Stability analysis was based on clone x year and clone x year x location interactions. Five stability parameters viz environmental variance, shukla's stability variance, regression of clonal latex yield on environmental index, variance due to regression and variance due to deviation from regression were applied. There was significant clone x environment effect at the two levels of interaction. Among the eleven clones, C 162 was outstanding for clonal stability and it can serve as donor parent for stability alleles. Three clones (C 76, C 150 and C 154) were also stable. The four stable clones (C 76, C 150, C 154 and C 162) are suitable for broad-spectrum recommendation for latex yield. Five clones (C 83, C 143, C 163, C 202 and RRIM 600) will require environment-specific recommendation because of their unstable phenotype. The stability feature of two clones (C 145 and C 159) was not clear and this will be investigated in subsequent studies