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Cooperative interactions between seed-borne bacterial and air-borne fungal pathogens on rice
 Authors and Affiliations  Authors and Affiliations
Boknam Jung1, Jungwook Park2, Namgyu Kim2, Taiying Li1, Soyeon Kim1, Laura E. Bartley 3, Jinnyun Kim2, Inyoung Kim2, Yoonhee Kang1, Kihoon Yun1, Younghae Choi1, Hyun-Hee Lee2, Sungyeon Ji1, Kwang Sik Lee1, Bo Yeon Kim1, Jong Cheol Shon4, Won Cheol Kim4, Kwang-Hyeon Liu4, Dahye Yoon5, Suhkman Kim5, Young-Su Seo2,* & Jungkwan Lee1,*
1Department of Applied Biology, Dong-A University, Busan 49315, Korea. 2Department of Microbiology, Pusan National University, Busan 46269, Korea. 3Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK 73019, USA. 4 BK21 Plus KNU Multi-Omics-Based Creative Drug Research Team, College of Pharmacy and Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu 41566, Korea. 5Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46269, Korea
*Correspondence to Young-Su Seo or Jungkwan Lee
Abstract
Bacterial-fungal interactions are widely found in distinct environments and contribute to ecosystem processes. Previous studies of these interactions have mostly been performed in soil, and only limited studies of aerial plant tissues have been conducted. Here we show that a seed-borne plant pathogenic bacterium, Burkholderia glumae (Bg), and an air-borne plant pathogenic fungus, Fusarium graminearum (Fg), interact to promote bacterial survival, bacterial and fungal dispersal, and disease progression on rice plants, despite the production of antifungal toxoflavin by Bg. We perform assays of toxoflavin sensitivity, RNA-seq analyses, lipid staining and measures of triacylglyceride content to show that triacylglycerides containing linolenic acid mediate resistance to reactive oxygen species that are generated in response to toxoflavin in Fg. As a result, Bg is able to physically attach to Fg to achieve rapid and expansive dispersal to enhance disease severity.
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박창진 (University of California Davis)
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