Phenotypic diversity analysis of Stylosanthes germplasms

To understand the genetic diversity distribution and genetic background of different Stylosanthes species, 60 accessions from 6 species were evaluated by cluster analysis and principal component analysis based on 17 phenotype traits. The results showed that banner stripe had the highest Shannon diversity index, followed by stem growth habits and stem indumentum. Plant height had the highest variation coefficient, followed by leaf width and petiole length. Clustering analysis demonstrated that 60 accessions were classified into 2 groups. Group I included 7 accessions of Stylosanthes capitata, 10 accessions of S. macrocephala, 7 accessions of S. hamata and 11 accessions of S. humilis, and group II included 8 accessions of S. gracilis and 17 accessions of S. guianensis. This study could provide useful information for selecting fine germplasm and improving breeding efficiency of Stylosanthes.