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《Acta Ecologica Sinica》 2004-10
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An analysis of genetic differentiation between Stipa grandis populations in middle and eastern Inner Mongolia steppe

ZHAO Nian-Xi,GAO Yu-Bao,WANG Jin-Long,REN An-Zhi,RUAN Wei-Bin,CHEN Lei,LIU Hui-Fen (College of Life Science,Nankai University,Tianjin 300071,China).  
Stipa grandis P. Smirn, an important perennial tussock grass in the Inner Mongolia steppe in China, is palatable for livestock and rich in nutrients, and is grazed by cattle and sheep at different stages of its growth cycle. Form. Stipa grandis is one of the major formations of the moderately-temperate steppe in Central Asia, and has considerable ecological and economic importance as it is not only suitable for grassland farming, but also provides an environmental defense for the Beijing-Tianjin area. Studies about Stipa grandis started in 1950's. The geographical distribution, growth and photo-physiological characteristics of Stipa grandis have been well documented, but molecular markers were used in the study of Stipa grandis in just recent years and documents are still lacking. In the present study, eleven sites were selected from the Form. Stipa grandis in the middle and eastern Inner Mongolia steppe. In each site, leaves of Stipa grandis plant were harvested for RAPD analysis, and at the same time, plant community investigation was carried out for five representative sites of the eleven. Eighteen oligonucleotides screened from 100 random decamer primers were selected to analyze the eleven populations of Stipa grandis, which produced profiles with intense and well-separated bands. A total of 221 bands were produced from the 18 selected primers with an average of 12.28 bands per primer, among which 121 bands were polymorphic. Twenty-five unique loci were obtained, accounting for 11.31% of the total amplified loci, and the percentage of unique loci was significantly correlated with aridity (r=0.76, P0.01) and with cumulative temperatures above 10℃ (r=0.81, P0.01) along the environmental gradient. Genetic distances between geographic populations of Stipa grandis ranged from 0.084 to 0.761, with an average of 0.243. A UPGMA dendrogram based on the genetic similarity coefficient matrix showed that the populations were most likely to be clustered if their geographic locations were nearer. A Mantel's test indicated that there was a significant correlation between the genetic distance and geographic distance (gg_(0.005)) in a larger range containing all of the 11 populations. As for the 8 populations within the Baiyinxile Farm, there was no correlation between genetic distance and geographic distance (gg_(0.05)), which was consistent with the results of the dendrogram. It may be reasonable to suggest that rainfall and temperature were the major factors that affected genetic differentiation of Stipa grandis on a larger scale (about 240km), and that on a smaller scale (below 50km) where the variation of rainfall and temperature was not significant, a combination of several environmental factors was responsible for the genetic differentiation of Stipa grandis populations. The composition, species frequency and importance value, and Shannon's index of five communities differed from each other. The similarity between communities were computed using the Pearson correlation method based on the importance values of the species and a dendrogram based on the similarity coefficient matrix was constructed using UPGMA in NTSYS-pc. This dendrogram was similar to the one that was established using the corresponding populations of Stipa grandis based on RAPD data. Further analysis with Mantel's test indicated that there was a positive correlation (r=0.7703, gg_(0.05)) between the similarity coefficient matrix of the five Stipa grandis populations and that of their communities.
【Fund】: 国家重点基础研究发展规划资助项目 ( G2 0 0 0 0 1860 1)~~
【CateGory Index】: Q943
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