Genetic diversity and genetic differentiation of natural populations of Pinus kesiya var. langbinanensis were examined by means of electrophoresis technique. Analysis of 9 enzyme systems including 16 loci showed that all the three natural popu-lations of the pine were high in genetic diversity but low in inter-population genetic differentiation. The proportion of polymorphic loci is 0.667, with each locus holding 2.13 alleles, averagely. The average expected and observed heterozygosity was 0.288 and 0.197, respectively. The gene differentiation among populations was 0.052, but the mean genetic distance was only 0.015.
The grading of Pinus kesiya var. langbianensis container seedling was studied by using stepwise cluster analysis. Height and base diameter were proposed as the quality indexes for grading, the criteria for class Ⅰ, Ⅱand Ⅲ were height≥18.5 cm, base diameter≥0.29cm, 18.5 cm>height≥15.5 cm, 0.29 cm>base diameter≥0.24 cm, and height<15.5 cm, base diameter<0.24 cm respectively.
