title: [Faba bean fusarium wilt (Fusarium oxysporum )control and its mechanism in different wheat varieties and faba bean intercropping system].
abstract: Field experiment and hydroponic culture were conducted to investigate effects of three wheat varieties (Yunmai 42, Yunmai 47 and Mianyang 29) and faba bean intercropping on the shoot biomass, disease index of fusarium wilt, functional diversity of microbial community and the amount of Fusarium oxysporum in rhizosphere of faba bean. Contents and components of the soluble sugars, free amino acids and organic acids in the root exudates were also examined. Results showed that, compared with monocropped faba bean, shoot biomass of faba bean significantly increased by 16.6% and 13.4%, disease index of faba bean fusarium wilt significantly decreased by 47.6% and 23.3% as intercropped with Yunmai 42 and Yunmai 47, but no significant differences of both shoot biomass and disease index were found as intercropped with Mianyang 29. Compared with monocropped faba bean, the average well color development (AWCD value) and total utilization ability of carbon sources of faba bean significantly increased, the amount of Fusarium oxysporum of faba bean rhizosphere significantly decreased, and the microbial community structures of faba bean rhizosphere changed as intercropped with YM42 and YM47, while no significant effects as intercropped with MY29. Total contents of soluble sugar, free amino acids and organic acids in root exudates were in the trend of MY29>YM47>YM42. Contents of serine, glutamic, glycine, valine, methionine, phenylalanine, lysine in root exudates of MY29 were significantly higher than that in YM42 and YM47. The arginine was detected only in the root exudates of YM42 and YM47, and leucine was detected only in the root exudates of MY29. Six organic acids of tartaric acid, malic acid, citric acid, succinic acid, fumaric acid, t-aconitic acid were detected in root exudates of MY29 and YM47, and four organic acids of tartaric acid, malic acid, citric acid, fumaric acid were detected in root exudates of YM42. Malic acid content in root exudates of YM47 and MY29 was significantly higher than that of YM42. In conclusion, intercropping influenced the microbial activity and substrate utilization of soil microorganisms, altered the microbial community diversity in rhizosphere of faba bean, reduced the amount of F. oxysporum and disease index of faba bean fusarium wilt, and promoted faba bean growth. Effects of intercropping on disease control were influenced by the intercropped wheat variety, suggesting that the differences of root exudates of wheat were important factors that affected soil-borne diseases control in intercropping.
authors.forename: Yan
authors.initials: Y
authors.lastname: Dong
authors.forename: Kun
authors.initials: K
authors.lastname: Dong
authors.forename: Yi
authors.initials: Y
authors.lastname: Zheng
authors.forename: Li
authors.initials: L
authors.lastname: Tang
authors.forename: Zhi-Xian
authors.initials: ZX
authors.lastname: Yang
mesh_terms: D000383:Agriculture / Q000379:methods*; D000596:Amino Acids / Q000737:chemistry; D018533:Biomass; D002264:Carboxylic Acids / Q000737:chemistry; D005670:Fusarium / Q000472:pathogenicity*; D010935:Plant Diseases / Q000382:microbiology / Q000517:prevention & control*; D053147:Plant Exudates / Q000737:chemistry; D018517:Plant Roots; D058441:Rhizosphere; D012987:Soil; D014908:Triticum; D031307:Vicia faba / Q000382:microbiology*
chemical_list: D000596:Amino Acids; D002264:Carboxylic Acids; D053147:Plant Exudates; D012987:Soil