Population genetic structure of Camellia nitidissima (Theaceae) and conservation implications
نویسندگان
چکیده
Camellia nitidissima Chi (Theaceae), with its golden-yellow flowers, is a famous ornamental species. Due to deforestation and collection of seedlings, its natural populations have receded greatly in recent decades. Genetic diversity and genetic differentiation of the twelve extant natural populations and one ex situ conserved population of C. nitidissima in China were analyzed using inter-simple sequence repeats (ISSR) markers. We found a low level of genetic diversity at both the species (P = 63.22%, Nei’s genetic diversity HT = 0.1561 and Shannon diversity Hsp = 0.2490) and population levels (P = 18.77%, HE = 0.0831 and Hpop = 0.1188) and a relatively high degree of differentiation among populations (AMOVA analysis: 41.85%; Hickory θB: 0.4056) in naturally occurring populations. In contrast, the ex situ population contained higher genetic variability compared to each natural population. No significant correlation was found between genetic diversity and population size. Based on the results, we suggest that all the wild C. nitidissima populations should be protected in situ. For the ex situ conservation of the species in Guilin Botanical Garden, samples from Long’an County should be added to the existing collections.
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