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Ex situ conservation efforts should focus on enhancing the exchange of seeds and seedlings among populations to facilitate gene exchange and recombination, and to help conserve genetic diversity.
      
Thus, the development of the new PRV recombinant expressing the modified GP5m protein as a candidate vaccine established the basis for the study of bivalent genetic engineering vaccines against PRRSV and PRV.
      
Genetic differentiation of Arthrobacter population from heavy metal-contaminated environment
      
Furthermore, genetic variation between subpopulations from different samples was revealed by analysis on their randomly amplified polymorphic DNA profile.
      
Nei genetic distance showed that the greatest differentiation occurred between subpopulation A and C.
      
Notably, either genetic distance between subpopulations from the layers of 5-10 cm and 25-30 cm of each tailing pile or between same layers of different tailing pile increased with the history of tailings.
      
It was assumed that soluble Pb may be responsible for the reduced genetic diversity of the Arthrobacter population.
      
Our data provided evidence that genetic differentiation of microbial populations was consistent with the changes of environmental factors, particularly heavy metals.
      
Genetic structure and differentiation of Psathyrostachys huashanica populations detected with RAPD markers
      
Randomly amplified polymorphic DNA (RAPD) markers were used to analyze the genetic structure and differentiation of P.
      
The percentage of polymorphic loci (PPB) was 60.66% in Huangpu Valley, 90.98% in Xian Valley, 95.08% in Huashan Valley, and the total PPB was 95.08%, which indicated a highly genetic variability of P.
      
The Shannon's Information index and GST were 0.3306 and 0.3263, respectively, indicating that there were more genetic variations within the subpopulations than those among the subpopulations.
      
Mean genetic distance is 0.1 571 (range: 0.0022-0.2901).
      
The highest value of genetic distance was found between the subpopulation (hp1) of Huangpu Valley and the highest altitude subpopulation (h8) of Huashan Valley.
      
Correlation analysis detected significant correlation between genetic distance and vertical distance of altitude.
      
Clustering analysis and principal coordinate analysis revealed the genetic differentiation among the populations of P.
      
Genetic diversity in Isoetes yunguiensis, a rare and endangered endemic fern in China
      
The genetic variation of 46 individuals from the population remaining at Pingba (Guizhou Province, China) was assessed by Random Amplified Polymorphic DNA (RAPD) finger-printing.
      
Of these, 62.1% were polymorphic loci, which indicated that high level genetic variation existed in the natural population.
      
The accumulation of genetic variation in the history of the taxon and the apparent minimal reduction effect on genetic diversity following destruction of habitat might be responsible for the high level genetic diversity presently remaining in the I.
      
 

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