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Hemarthria  compressa is one of the most important and widely utilized  forage crops in south China, owing to its high forage yield and capability of  adaptation to hot and humid conditions. We examined the population structure  and genetic variation within and among 12 populations of H. compressa in  south China using sequence-related amplified polymorphism (SRAP) markers. High  genetic diversity was found in these samples [percentage polymorphic bands  (PPB) = 82.21%, Shannon's diversity index (I) = 0.352]. However, there was  relatively low level of genetic diversity at the population level (PPB =  29.17%, I = 0.155). A high degree of genetic differentiation among populations  was detected based on other measures and molecular markers (Nei's genetic  diversity analysis: G(ST) =  54.19%; AMOVA analysis: F(ST) =  53.35%). The SRAP markers were found to be more efficient than ISSR markers for  evaluating population diversity. Based on these findings, we propose changes in  sampling strategies for appraising and utilizing the genetic resources of this  species.

Molecular diversity and population structure of the forage grass Hemarthria compressa (Poaceae) in south China based on SRAP markers