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PLANT GENETIC RESOURCES

Genetic Diversity and Population Structure of Caragana korshinskii Revealed by AFLP

^a Institute of Animal Science, Chinese Academy of Agricultural Science, China
^b Dep. of Plant and Soil Science, Oklahoma State Univ., Stillwater, OK
^c Institute of Grassland Science, China Agricultural University, China. This study was supported by the Hi-Tech Research and Development Program (No. 2002AA241091) from the Ministry of Science and Technology of China

^* Corresponding author (gaohongwen{at}263.net).

Caragana korshinskii Kom. is a perennial sandy grassland and desert deciduous shrub species, indigenous to and distributed in the northwest of China and Mongolia, and important in vegetation rehabilitation of widely degraded and degrading semiarid and arid regions because of its high ecological and economic values. To assess the genetic diversity and population structure of C. korshinskii, 10 natural populations from the Loess plateau and Inner Mongolia plateau in China were analyzed for amplified fragment length polymorphisms. Four primer combinations produced 358 bands across a total of 98 individuals. A high percentage of polymorphic loci was observed at species level (p = 93.9%). Multivariate analyses separated accessions into two regional groups corresponding to the Loess and Inner Mongolia plateaus. Based on analysis of molecular variance, 77.8% of the genetic variation of C. korshinskii was within population, 7% difference between regions, and 15.2% among collection sites within regions. An indirect estimate of the number of migrants per generation (N_m = 1.7) indicated that gene flow was high among populations of the species. A significant correlation (r = 0.58) between genetic and geographic distance was detected. Results of this study suggested that C. korshinskii has a high genetic variability and potential as a source of variation for breeding programs.

Abbreviations: AFLP, amplified fragment length polymorphism • AMOVA, analysis of molecular variance • ISSR, inter–simple sequence repeat • ITS, internal transcribed spacer • RAPD, random amplified polymorphic DNA