Abstract: It studied the phenotypic variation in the leaves of Manglietia conifera with 12 provenances seedlings from Vietnam, and measured the leaf morphological traits(length, width, area, perimeter, length-width ratio, petiole length) and micro morphological characteristics of stomata(density, length, width, area, length-width ratio) by the variance analysis, variable coefficient(CV), correlation analysis and principal components analysis(PCA). There were significant differences in leaf phenotypic traits among M.conifera provenances. The average CV of leaf morphological traits of provenance LC2 was the maximum(22.09%), and TQ2 was the minimum(12.76%), leaf area recorded the largest CV(28.60%) while stomata width recorded the smallest CV(5.19%). The result of correlation analysis showed that there was significant correlation between leaf phenotypic traits(P<0.05), leaf perimeter was significantly correlated with longitude, and leaf length-width ratio were significantly correlated with longitude and latitude(P<0.05), leaf phenotypic traits were not significantly correlated with longitude and altitude)(P<0.05). By PCA, the cumulative contribution rate of the first 3 principal components was 89.29%, basically represent all the information of the original character. By cluster analysis, the 12 provenances could be clustered into 4 groups at the Euclidean distance of 5. There is abundant variation of leaf phenotypic traits in M.conifera provenances, longitude and latitude have obvious influence on leaf morphological characteristics of M.conifera, and there is difference of variation degree among provenances and leaf phenotypic traits of M.conifera. Our study provides theoretical basis for genetic improvement of M.conifera.

Key words: Manglietia conifera Dandy, provenance, leaf, phenotypic traits, stomata