Abstract:

In order to understand the diversity of leaf phenotypic characters of Musa spp. (banana) germplasm resources and improve the protection and utilization of excellent banana germplasms in Yunnan, 18 leaf phenotypic characters of 49 Musa spp. germplasms were observed and described, and the data were analyzed by variation analysis, Shannon-weaver diversity index analysis, correlation analysis, principal component analysis and cluster analysis. The genetic diversity index of leaf phenotypic quantitative characters was higher than that of qualitative characters. The variation degree of quantitative characters was high, and the differences among Musa spp. germplasms were obvious. The correlation analysis showed that 31 pairs of characters had extremely significant correlation (P<0.01), and 18 pairs had significant correlation (P<0.05). The leaf phenotypic characters were closely related to each other. The principal component analysis showed that the 18 characters were transformed into 6 principal components, and the cumulative contribution rate was 78.80%, which reflected most information of leaf phenotypic characters of banana germplasms. Cluster analysis was conducted on the 49 banana germplasms. The germplasms were divided into four groups at the European genetic distance of 10, which were M. acuminate, M. paradisiaca and M. sapientum, wild Musa, and M. cauendisihii. The leaf orientation, shape of leaf base edge, color of petiole base plaques and petiole groove shape were the main characters to distinguish different groups. The leaf phenotypic diversity of Musa spp. germplasm resources is rich, and the 11 characters obtained by analysis and screening are the key indexes for the analysis of leaf phenotypic diversity of Musa spp. germplasm resources.

Key words: Musa spp., leaf phenotypic characters, correlation analysis, principal component analysis, cluster analysis