Preliminary study on the herbicidal mechanism of Fusarium avenaceum HY-041
To clarify the mechanism of Fusarium avenaceum HY-041 infestation on Avena fatua L.,and to in-vestigate the effect of HY-041 on the physiological and biochemical indexes of A.fatua L.,so as to provide a theo-retical basis for the development of F.avenaceum as a bioherbicide,the infestation process of A.fatua L.by the bio-control strain HY-041 was observed by electron microscope scanning technique,and the pathway of action of HY-041 against A.fatua L.was clarified through the determination of MDA,SOD,CAT and POD activities and sol-uble protein content in A.fatua L.plants inoculated with HY-041 strain.As results,after inoculation of strain HY-041 in A.fatua L.plants,malondialdehyde(MDA)content gradually increased in the weed plants,and the activities of the peroxidation protective enzyme systems,including superoxide dismutase(SOD),catalase(CAT),and peroxidase(POD)showed an overall trend of first increasing and then decreasing.The soluble protein content first increased and then decreased after inoculation,and the degradation of soluble proteins began at the 6th day after inoculation,reduc-ing plant antioxidant properties.Scanning electron microscope observation revealed that the mycelium of strain HY-041 invaded the leaf tissue through the stomata and parasitically reproduced and produced spores in the tissue,gradually destroying the tissue,and at the same time,the surface of the leaf began to lose its green color and was accompanied by the formation of lesions,which ultimately resulted in the plant's inability to photosynthesize and died.In conclusion,the infestation process of F.avenaceum HY-041 on A.fatua L.was clari-fied by an electron microscope scanning,and the inhibition pathway of strain HY-041 on the growth of A.fatua L.was clarified through the measurement of physiological and biochemical indexes,which can lay a theoretical foundation for the application of F.avenaceum in weed control.
F.avenaceumA.fatua L.electron microscope scanningphysiological and biochemical indicesweed control mechanism
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