Res. Plant Dis > Volume 25(3); 2019 > Article
Research in Plant Disease 2019;25(3):103-107.
DOI: https://doi.org/10.5423/RPD.2019.25.3.103    Published online September 30, 2019.
Phytobiome as a Potential Factor in Nitrogen-Induced Susceptibility to the Rice Blast Disease
Junhyun Jeon
Department of Biotechnology, College of Life and Applied Sciences, Yeungnam University, Gyeongsan 38541, Korea
Correspondence:  Junhyun Jeon, Tel: +82-53-810-3030, Fax: +82-53-810-4769, 
Email: jjeon@yu.ac.kr
Received: September 06, 2019   Revised: September 19, 2019   Accepted: September 20, 2019
Abstract
Roles of nutrients in controlling plant diseases have been documented for a long time. Among the nutrients having impact on susceptibility/resistance to crop diseases, nitrogen is one of the most important nutrients for plant growth and development. In rice plants, excess nitrogen via fertilization in agricultural systems is known to increase susceptibility to the rice blast disease. Mechanisms underlying such phenomenon, despite its implication in yield and sustainable agriculture, have not been fully elucidated yet. A few research efforts attempted to link nitrogen-induced susceptibility to concomitant changes in rice plant and rice blast fungus in response to excess nitrogen. However, recent studies focusing on phytobiome are offering new insights into effects of nitrogen on interaction between plants and pathogens. In this review, I will first briefly describe importance of nitrogen as a key nutrient for plants and what changes excess nitrogen can bring about in rice and the fungal pathogen. Next, I will highlight some of the recent phytobiome studies relevant to nitrogen utilization and immunity of plants. Finally, I propose the hypothesis that changes in phytobiome upon excessive nitrogen fertilization contribute to nitrogen-induced susceptibility, and discuss empirical evidences that are needed to support the hypothesis.
Key Words: Nitrogen-induced susceptibility, Phytobiome, Plant immunity, Rice blast disease
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