Phenotypic correlation among yield and yield-related traits in resistant F2 segregants of yard long bean (Vigna unguiculata subsp. sesquipedalis)

Abstract

A study was conducted to assess the phenotypic correlation among yield and its component traits in the resistant F2 segregants of yard long bean (Vigna unguiculata subsp. sesquipedalis). Thirteen resistant F2 plants, identified under field and artificial inoculation, were evaluated for yield and related quantitative traits. The phenotypic correlation analysis revealed a positive association of yield per plant with pod length, pod weight, pods per plant, and hundred seed weight, indicating the importance of these characters in determining yield performance. Vine length showed a weak or negative correlation with yield, suggesting that excessive vegetative growth may not contribute directly to yield in resistant backgrounds. Days to first flowering also showed negative correlation with yield. The results provide preliminary insights into trait relationships within resistant segregants, which may aid in the selection of desirable combinations for further breeding.