Recently, a vast number of studies focusing on population genetic variation and structure, colonization and extinction, adaptive radiation and speciation, have become available for island plant groups ( Emerson, 2002). Due to their limited geographical range, habitat specificity and small population size, island species have even been considered as models for studying evolution, and have fascinated many evolutionary biologists since the era of Darwin and Wallace ( Baldwin et al., 1998 Grant, 1998 Stuessy and Ono, 1998). Oceanic island ecosystems have offered great opportunities for the study of evolution owing to their discrete geographical nature and diversity of species and habitats ( Adsersen, 1995 Crawford and Stuessy, 1997 Emerson, 2002). Low levels of genetic diversity and a high degree of population differentiation indicate that management strategies should include conservation of natural habitats occupied by all six wild populations, and sampling of germplasm resources from multiple seed sources.Ĭonservation management, endangered plant, genetic structure, Neolitsea sericea, RAPD, Zhoushan archipelago INTRODUCTION Conclusions Removal of plants from the wild for horticulture purposes has eroded the level of genetic variation of N.Based on analysis of molecular variance, a high degree of among-population differentiation was revealed for both natural (0♳87) and cultivated populations (0♵98). The cultivated populations (PPB = 18♹ %, H E = 0♰60, S = 0♰92) were genetically less diverse than the natural populations (PPB = 23♱ %, H E = 0♰82, S = 0♱23).
sericea exhibited low levels of genetic variation. Despite being a woody, long-lived, perennial, outcrossing and insect-pollinated plant, N. Key Results A total of 99 discernible loci were obtained for all populations using ten primers, 50♵ % of which were polymorphic.Methods Levels and patterns of genetic diversity in 114 individuals from six natural populations and four cultivated populations of the insular endangered plant Neolitsea sericea (Lauraceae) on the Zhoushan archipelago were assessed using random amplified polymorphic DNA (RAPD) markers.Because of the long-term influences of human activities, the original forest vegetation on the large islands has been badly damaged and its plant diversity reduced.
It separated from the mainland about 9000 years ago due to rising sea levels and climate change.
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