title: The composition of root exudates from two different resistant peanut cultivars and their effects on the growth of soil-borne pathogen.
abstract: The high incidence of various soil-borne diseases in the monoculture field of peanut is a major production constraint in the red soil regions of southern China. The peanut root exudates are generally thought to play an important role in regulating soil-borne pathogens. The responses of the soil-borne pathogens, Fusarium oxysporum and F. solani to the peanut root exudates were studied using one susceptible cultivar Ganhua-5 (GH) and one mid-resistant cultivar Quanhua-7 (QH) as the test materials. The components and contents of the amino acids, sugars and phenolic acids in the peanut root exudates were determined. The results demonstrated that the root exudates from both susceptible and mid-resistant cultivars significantly promoted the spore germination, sporulation and mycelial growth of soil-borne pathogens, F. oxysporum, F. solani compared with the control. The extent of the stimulation was depended on the strains of the Fusarium tested, and gradually increased with the increased concentrations of peanut root exudates. HPLC analysis showed that the contents of sugars, alanine, total amino acids in the root exudates of GH were significantly higher than that in QH, whereas the contents of p-hydroxybenzoic acid, benzoic acid, p-coumaric acid and total phenolic acids were significantly lower than that in QH. Results of the study suggested that the differences in the root exudates from the different peanut cultivars were considered to regulate the wilt-resistance mechanism in the rhizosphere of peanut. The results are therefore crucial important to illustrate the mechanism of peanut replanted obstacle, and to develop its control techniques in the red soil regions of southern China.
authors: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. xgli@issas.ac.cn
authors: Xiao-gang
authors: XG
authors: Li
authors: Tao-lin
authors: TL
authors: Zhang
authors: Xing-xiang
authors: XX
authors: Wang
authors: Ke
authors: K
authors: Hua
authors: Ling
authors: L
authors: Zhao
authors: Zheng-min
authors: ZM
authors: Han
mesh_terms: D000383:Agriculture / Q000379:methods*; D000409:Alanine / Q000032:analysis; D000596:Amino Acids / Q000032:analysis; D010367:Arachis / Q000737:chemistry* / Q000235:genetics; D002681:China; D002851:Chromatography, High Pressure Liquid; D005670:Fusarium / Q000187:drug effects* / Q000254:growth & development; D053147:Plant Exudates / Q000032:analysis / Q000494:pharmacology*; D018517:Plant Roots / Q000737:chemistry*; D012988:Soil Microbiology; D013045:Species Specificity; D013171:Spores, Bacterial / Q000187:drug effects
chemical_list: D000596:Amino Acids; D053147:Plant Exudates; D000409:Alanine
keywords: Amino acids; Peanut; Phenolic acids.; Root exudates; Soil-borne pathogens