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Cycas hongheensis S.Y.Yang & S.L.Yang is a critically endangered species with only two known populations restricted to a dry and hot limestone hillside along the Red River in Baohe village, Yunnan province of China. It is extremely urgent to protect this species, as the number of individuals has dropped dramatically in the last few years. Fifteen microsatellite markers coupled with a single copy nuclear gene ncpGS were applied to study the genetic diversity and genetic structure of C. hongheensis. In contrast to previously published studies in Cycas, C. hongheensis maintained a relatively high degree of genetic diversity (SSR: Na = 3.967, PPL = 90.0%, HE = 0.435, AR = 4.162, I = 0.835; ncpGS: Hd = 0.45625, Ï€ = 0.01048). Genetic differentiation was extremely low with only 6.58% of variation residing between populations. Gene flow between populations (Nm) was 3.55. Moreover, we inferred that there was a historically large population comprising the present region of two populations. As a result of environment change and hum
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