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Genetic research

Genetic Diversity and Population Differentiation of Pyrenophora Graminea on Highland Barley

Strategic Insights

— 2 min read

Research has been conducted to examine the genetic diversity and population differentiation of Pyrenophora graminea, a pathogen that causes leaf stripe disease on highland barley in Qinghai province, China. The study collected 329 strains of the pathogen and evaluated their colony growth rate, pathogenicity, and genetic diversity using 49 SSR markers. The results showed that the pathogenicity of P. graminea varied among different regions and cultivars, with disease incidence ranging from 0 to 62.2% on two highland barley cultivars. Genetic diversity analysis revealed that strains from Xining and Haibei had higher genetic diversity than those from other regions. The population differentiation of P. graminea was observed among the six sampling regions, with strains sorted into three molecular groups according to principal coordinate analysis, hierarchical cluster analysis, and Bayesian structure analysis.

Key Takeaways:

  • A total of 329 strains of Pyrenophora graminea were collected from six regions of Qinghai province, China, and identified as P. graminea based on morphological characteristics and rDNA-ITS sequencing.
  • The colony growth rate of P. graminea was evaluated on PDA plates, with most strains ranging from 25 to 30 mm/d.
  • The pathogenicity of P. graminea was tested on two highland barley cultivars, Caiqing 1 and Kunlun 14, with disease incidence ranging from 0 to 44.4% and 0 to 62.2%, respectively.
  • Genetic diversity among the 230 strains was analyzed using 49 SSR markers, revealing that strains from Xining and Haibei had higher genetic diversity than those from other regions.
  • Population differentiation of P. graminea was observed among the six sampling regions, with strains sorted into three molecular groups according to principal coordinate analysis, hierarchical cluster analysis, and Bayesian structure analysis.
  • The study provides valuable information for understanding the genetic diversity and population differentiation of P. graminea in Qinghai province and for developing management strategies for leaf stripe on highland barley.
  • The research was conducted by Guomei Bai and colleagues from Qinghai University, with additional authors including Ke Jiang, Erjing Si, Lu Hou, and Xianzhen Zhou.
  • The study was published in the journal Plant Disease in 2025.

Statistics:

  • 329 strains of Pyrenophora graminea were collected from six regions of Qinghai province, China.
  • 230 strains were identified as P. graminea based on morphological characteristics and rDNA-ITS sequencing.
  • The colony growth rate of P. graminea ranged from 25 to 30 mm/d on PDA plates.
  • Disease incidence on highland barley cultivars Caiqing 1 and Kunlun 14 ranged from 0 to 44.4% and 0 to 62.2%, respectively.
  • 49 SSR markers were used to analyze genetic diversity among the 230 strains.
  • Genetic diversity in Xining and Haibei was higher than in other regions, with Nei's index and Shannon index values of 0.297 and 0.445, respectively.
  • Population differentiation of P. graminea was observed among the six sampling regions, with strains sorted into three molecular groups.

Sources:

  • Bai, G., Jiang, K., Si, E., Hou, L., Zhou, X. (2025). Pathogenicity, genetic diversity and population differentiation of Pyrenophora graminea on highland barley in Qinghai Province. Plant Disease.
  • NewsRx (2025). Studies from Qinghai University Have Provided New Data on Plant Diseases (Pathogenicity, genetic diversity and population differentiation of Pyrenophora graminea on highland barley in Qinghai Province). Life Science Weekly. October 21, 2025; p 7160.

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