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Acta Prataculturae Sinica ›› 2019, Vol. 28 ›› Issue (10): 66-77.DOI: 10.11686/cyxb2018677

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Effects of Epichloё endophytic fungi infection in wild barley (Hordeum brevisubulatum) on soil chemical properties and the soil microbial community

JIN Yuan-yuan, BOWATTE Saman*, JIA Qian-min, HOU Fu-jiang, LI Chun-jie   

  1. State Key Laboratory of Grassland Agro-ecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China
  • Received:2018-10-10 Revised:2019-02-25 Online:2019-10-20 Published:2019-10-20
  • Contact: E-mail: samanbowatte@lzu.edu.cn

Abstract: An 8-month greenhouse study was conducted to investigate the belowground effects of infection of wild barley by the foliar endophyte Epichloё bromicola. The effects of endophyte infection status (E+: endophyte infected; E-: endophyte free) on soil chemical and microbiological properties were tested in three soils collected from Maqu, Yuzhong, and Linze in Gansu province, China. We measured the dry matter production of plants at 3, 6, and 8 months after establishment. The soil carbon, nitrogen, and phosphorous contents, pH, and the abundance of bacteria, fungi, and key bacteria involved in the soil nitrogen cycle were determined at 6 and 8 months after plant establishment. The dry matter production of wild barley was significantly higher in E+ plants than in E- plants in all three soils. Irrespective of endophyte status, the dry matter production was highest in Linze soils and lowest in Maqu soils. The presence of the endophyte significantly increased soil total nitrogen content and the abundance of ammonia-oxidizing bacteria. The effects of endophyte status on total soil carbon, microbial biomass carbon, pH, abundance of bacteria, fungi, denitrifying bacteria, and nitrous oxide-reducing bacteria varied with soil type and plant age. The total phosphorus content in soil varied significantly with soil type and plant age but not with endophyte status. These results confirmed that E. bromicola infection of wild barley influences the chemical and microbiological properties of soil in a soil type- and plant age-dependent manner. We suggest that long-term field studies in the future would be beneficial for understanding the mechanisms driving these observed changes in soil properties.

Key words: wild barley, endophytic fungi, soil microbes