Abstract

ARAMENDIZ-TATIS, HERMES; ESPITIA-CAMACHO, MIGUEL  and  CARDONA-AYALA, CARLOS. Correlations and path analysis for quantitative characteristics in semi-prostrate cowpea bean genotypes (Vigna unguiculata (L.) Walp.). rev.colomb.cienc.hortic. [online]. 2020, vol.14, n.2, pp.216-223.  Epub Nov 11, 2022. ISSN 2011-2173.  https://doi.org/10.17584/rcch.2020v14i2.10758.

The cowpea is the most important legume in the Colombian Caribbean because of its positive impact on the food and nutritional security of low-income rural families. It is cultivated by small producers but its yields per hectare does not exceed 600 kg because of the use of obsolete cultivars. The objective of the research was to estimate correlations between seven quantitative characteristics and the path analysis between grain yield and six quantitative characteristics, with the results of the evaluation of 10 genotypes with a semi-prostrate growth habit and high grain yield, grown in eight environments in humid and dry tropics in the Colombian Caribbean region. A randomized complete blocks design was used, with four repetitions. Significant differences between the environments, genotypes and genotype ₓ environment interaction were detected. The genotypic correlations had a greater magnitude than the phenotypic ones, highlighting the correlation between grain width (GW) and grain yield (GY), rP = 0.69*, rG = 0.78*, and between the weight of 100 seeds (100SW) and GW, rP = 0.97**, rG = 0.99 **. The characteristics GW and number of pods per plant (NPP) had positive direct effects on the GY, with an indirect negative effect on NPP by way of GW. The height of the first pod (HFP), the number of seeds per pod (NSP) and the 100SW directly and negatively influenced the GY of the 10 semi-prostrate cowpea cultivars.

Keywords : genotypes; genotype-environment interaction; direct and indirect effects; quantitative genetics.

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