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Interspecific plant interaction via root exudates structures the disease suppressiveness of rhizosphere microbiomes

Molecular Plant 2023年第5期16卷 849-864页

作者： Xingang Zhou Jingyu Zhang Muhammad Khashi u Rahman Danmei Gao Zhong Wei Fengzhi Wu Francisco Dini-Andreote Key Laboratory of Biology and Genetic Improvement of Horticultural Crops(Northeast Region) Ministry of Agriculture and Rural AffairsDepartment of HorticultureNortheast Agricultural UniversityChangjiang 600Harbin 150030P.R.China Jiangsu Provincial Key Lab for Organic Solid Waste Utilization National Engineering Research Center for Organic-based FertilizersJiangsu Collaborative Innovation Center for Solid Organic Waste Resource UtilizationNanjing Agricultural UniversityWeigang No.1Nanjing 210095P.R.China Department of Plant Science&Huck Institutes of the Life Sciences The Pennsylvania State UniversityUniversity ParkPAUSA

Terrestrial plants can affect the growth and health of adjacent plants via interspecific ***,we studied the mechanism by which plant root exudates affect the recruitment of the rhizosphere microbiome in adjacent plants—with implications for plant protection—using a tomato(Solanum lycopersicum)–potatoonion(Allium cepa ***)intercropping ***,we showed that the intercropping system results in a disease-suppressive rhizosphere microbiome that protects tomato plants against Verticillium wilt disease caused by the soilborne pathogen Verticillium ***,16S rRNA gene sequencing revealed that intercropping with potatoonion altered the composition of the tomato rhizosphere microbiome by promoting the colonization of specific Bacillus *** taxon was isolated and shown to inhibit *** growth and induce systemic resistance in tomato ***,a belowground segregation experiment found that root exudates mediated the interspecific interaction between potatoonion and ***,experiments using split-root tomato plants found that root exudates from potatoonion,especially taxifolin—a flavonoid compound—stimulate tomato plants to recruit plant-beneficial bacteria,such as Bacillus ***,ultra-high-pressure liquid chromatography–mass spectrometry analysis found that taxifolin alters tomato root exudate chemistry;thus,this compound acts indirectly in modulating root colonization by Bacillus *** results revealed that this intercropping system can improve tomato plant fitness by changing rhizosphere microbiome recruitment via the use of signaling chemicals released by root exudates of *** study revealed a novel mechanism by which interspecific plant interaction modulates the establishment of a disease-suppressive microbiome,thus opening up new avenues of research for precision plant microbiome manipulations.

关键词： intercropping microbiome rhizosphere root exudates soilborne disease

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The Concentration of 2-Propenyl Glucosinolate in Biofumigant Crops Influences Their Anti-Fungal Activity (In-Vitro) against Soil-Borne Pathogens

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Journal of Agricultural Chemistry and Environment 2016年第1期5卷 38-45页

作者： Oscar Villalta Denise Wite David A. Riches Jorge Guiano Vijey Chandolu Cassie Scoble Caroline Donald Ian J. Porter Scott W. Mattner Department of Environment and Primary Industries Knoxfield Victoria Australia

This study investigated the biofumigation potential of nine Brassica species/cultivars by determining the levels of 2-propenyl glucosinolate in their roots and shoots, and their in-vitro suppression of four major soil-borne pathogens of vegetable crops. Hydrolysis of 2-propenyl GSL produces volatile isothiocyanate (ITC) compounds which are known to have anti-fungal activity. HPLC results showed that 2-propenyl GSL only occurred in root and shoot residue of flowering plants of four Brassica cultivars developed for green manuring (Caliente 199?, Mustclean?, Nemfix? and BQ Mulch?) and in the standard (mustard seed meal) treatment Fumafert?. Levels of 2-propenyl GSL varied several fold within the four Brassica cultivars, with 77-88% of the total concentrations recorded in the shoot tissues. In in vitro assays, the level of fungal suppression by volatiles emitted by hydrated shoot and root residues related to their content of 2-propenyl GSL, and the dose of residue applied to five soilborne test pathogens (S. minor, Rhizoctonia solani, Fusarium oxysporum, Pythium dissotocum and Rhizoctonia solani). The variation in 2-propenyl GLS levels found in the Brassica green manure crops tested provides scope for selecting cultivars with greater potential for biofumigation, and to control multiple soil-borne disease problems in vegetable farms.

关键词： Brassica Glucosinolate soilborne disease Biofumigation Sclerotinia

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