Agro-morphological characterization and genotypic diversity of chilli (Capsicum. frutescens) landraces of Bangladesh

Abstract

Samples of 82 chilli (Capsicum spp.) genotypes grown during the Rabi season of 2016-17 were characterized based on 28 qualitative and 7 quantitative agro-morphological markers. The genotypes were collected and conserved in the Plant Genetic Resources Centre (PGRC) of the Bangladesh Agricultural Research Institute (BARI). The Chi-square (χ 2) tests and the Shannon Diversity Index (H´) were used for the genetic diversity study. All the characters under study were distributed independently except cotyledon leaf shapes and leaf pubescence density. The values of H´ of the genotypes varied widely, the maximum values being observed for the cotyledon leaf shape, leaf density, and anthocyanin leaf spot on the fruit. In contrast, the lowest values were recorded for pigmentation of node and leaf color. The estimated coefficient of variation was the highest while it was the lowest for one thousand seed weights. No variation was observed for calyx annular constriction of fruit. Analytical functions of DIVA-GIS (Geographic Information System) mapping localized the accessions into 10 districts and marked the areas of insufficient collection. Accession AMA-248 belonging to Mymensingh was almost round fruit. Accessions RAI-232 and RAI-80 belonging to Chattogram, AMA-335 belonging to Sherpur, AMA-361 belonging to Jamalpur, RAI-80 belonging to Chattogram, and AHI-01 belonging to Jhenaidah were elongated fruit. Germplasms collected from Chattogram showed the maximum variation in traits of cotyledon leaf color and stem color at the seedling transplanting age. The variation observed in different characters could be important characters in selecting parents for breeding programs.