科研之友
微信
新浪微博
Facebook
分享链接
摘要
Of 70 micro-organisms (fungi, bacteria and actinomycetes) isolated from soil using vegetable tissue baits, 16 produced substances in culture fluids capable of preventing the development of blast caused by Magnaporthe oryzae on rice leaves with little or no inhibitory effect on the conidial germination of the pathogen. Isolate KS-F14, which secreted substances capable of activating resistance in untreated leaves, was selected and identified as Fusarium solani. The resistance-inducing substances were effective at pH values ranging from 5 to 10 and were stable under high temperatures, maintaining approximately the same level of activity even after autoclaving for 20 min. After application, the activated resistance in rice leaves persisted for 14 days. The polar solvent extracts of freeze-dried KS-F14 secretions were effective in activating resistance against M. oryzae in rice plants. The non-polar solvent extracts were also effective, albeit not as effective as the polar solvent extracts, indicating that although the majority of the secreted resistance-inducing compounds are hydrophilic, some of the compounds are hydrophobic. Treating secretions with cation or anion exchange resins only partially reduced their resistance-inducing ability, suggesting that the resistance-inducing components include both charged and non-charged compounds. The resistance-inducing compounds produced by F. solani have the potential to be developed into a commercial product for the control of rice blast and possibly other plant diseases.
- 出版日期2014-8
