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Figure 2: Genetic similarity among Poa genotypes revealed by UPGMA cluster
analysis based on AFLP data.
The heterozygosity is bigger (25.6 %) in P. humilis than in P. angustifolia (23.4 %).
The heterozygosity and polymorphism in P. humilis populations are bigger than P.
angustifolia populations (Table 3).
Table 3: Mean heterozygosity and polymorphism rate in populations of P.
angustifolia and P. humilis.
Heterozygosity (%) Polymorphism (%)
P. humilis 25.60 94.40
P. angustifolia 23.40 83.80
The mean theta value of 0.2581 (0.2307 lower limit and 0.2827 upper limit) does not
mean significant differences among the populations of studied species with 95%
confidence interval and 1000 bootstrap repeat.
Populations were found to be genetically similar and there was a wide range of genetic
variability among germplasm sources. The different leaf blade width of the tillers of the
two species is apparent, but sharp separation cannot be seen between the two species in
the clusters on the basis of AFLP markers. This questions the value of the leaf blade
width as a taxonomic character. The species level difference is ambiguous between the
four species.
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