AUTHOR=Fang Yuting , Zhang Limeng , Jiao Yongge , Liao Jingjing , Luo Lifen , Ji Sigui , Li Jiangzhou , Dai Kuai , Zhu Shusheng , Yang Min 

TITLE=Tobacco Rotated with Rapeseed for Soil-Borne Phytophthora Pathogen Biocontrol: Mediated by Rapeseed Root Exudates

JOURNAL=Frontiers in Microbiology

VOLUME=7

YEAR=2016

URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2016.00894

DOI=10.3389/fmicb.2016.00894

ISSN=1664-302X

ABSTRACT=<p>Black shank, caused by <italic>Phytophthora parasitica</italic> var. <italic>nicotianae</italic>, is a widespread and destructive disease of tobacco. Crop rotation is essential in controlling black shank. Here, we confirmed that rotating black shank-infested fields with rapeseed (<italic>Brassica napus</italic>) suppressed the incidence this disease. Further study demonstrated that rapeseed roots have a strong ability to attract zoospores and subsequently stop the swimming of zoospores into cystospores. Then, rapeseed roots secrete a series of antimicrobial compounds, including 2-butenoic acid, benzothiazole, 2-(methylthio)benzothiazole, 1-(4-ethylphenyl)-ethanone, and 4-methoxyindole, to inhibit the cystospore germination and mycelial growth of <italic>P. parasitica</italic> var. <italic>nicotianae</italic>. Thus, rapeseed rotated with tobacco suppresses tobacco black shank disease through the chemical weapons secreted by rapeseed roots.</p>