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- W2384174795 abstract "With special geographic location and climatic conditions, the subtropical areas in China has developed the largest and typical evergreen broadleaved forest in the world, evergreen shrubs is one important constituent of the forest. Unfortunately, little information is available with regard to the genetic variation of evergreen shrubs in evergreen broadleaved forest. Camellia rosthorniana (Theaceae) is a long-lived evergreen shrub species, which distributes widely in subtropical areas of China and occurs in many types of communities in Jinyun mountain (29°50′N,106°26′E).In the present study, RAPD (Random amplified polymorphic DNA) was used to detect the genetic structure and DNA diversity of three spatially isolated populations of Camellia rosthorniana in different communities, i.e, giant bamboo forest, mixed coniferous broadleaved forest and evergreen broadleaved forest in Mt Jinyun. The distances between giant bamboo forest and evergreen broadleaved forest, between giant bamboo forest and mixed coniferous broadleaved forest, between mixed coniferous broadleaved forest and evergreen broadleaved forest were 100m, 1000m, and 1100m, respectively. 18 samples were collected from each population. To reduce the chance of consanguinity, trees sampled from the same population were selected at least 10m apart . A total of 40 random primers were initially screened using 2 representatives from each of the three populations. 10 primers that gave distinct, repeatable fragment patterns were selected for final analysis. All 54 Camellia rosthorniana individuals sampled were genetically different from each other. The number of loci and that of polymorphic loci were 130、126、133 and 105、103、109 for giant bamboo forest、mixed coniferous broadleaved forest and evergreen broadleaved forest, respectively. On average, the percentage of polymorphic loci was 83.3%, indicating high polymorphism in Camellia rosthorniana population. Based on the band frequency in terms of population and species, estimation of Nei's gene diversity(H) and Shannon's index of diversity(I) were performed using Popgene 1.31. Evergreen broadleaved community had the highest genetic diversity(H=0.2095, I=0.3345), followed by giant bamboo community(H=0.1981, I=0.3148) and mixed coniferous broadleaved community(H=0.1934, I=0.3085). Genetic differentiation (H SP-H POP)/H SP estimated with Shannon's index and coefficient of gene differentiation (G ST) were 0.0812 and 0.0751, respectively. Nei's (1972) genetic distances between populations were also caculated, which ranged from 0.0177 to 0.0393 and did not correspond to geographic distances. Field survey showed that the three populations differed in both population size (largest in evergreen broadleaved community and smallest in giant bamboo community) and individual growth (basal diameters of the largest individual of Camellia rosthorniana in giant bamboo community, mixed coniferous broadleaved community and evergreen broadleaved community were 3.4cm, 5.3cm, and 6.4cm, respectively), thus, genetic diversity of each population may be the result of adaptation to its own microenvironments." @default.
- W2384174795 created "2016-06-24" @default.
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- W2384174795 date "2003-01-01" @default.
- W2384174795 modified "2023-09-25" @default.
- W2384174795 title "RAPD analysis of Camellia rosthorniana populations in different communities in Jinyun Mountain" @default.
- W2384174795 hasPublicationYear "2003" @default.
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