Effects and Colonization of Beauveria bassiana in Maize under Stress of Exserohilum turcicum Infection

doi:10.16409/j.cnki.2095-039x.2022.05.008

Abstract

Abstract: This study aims to clarify the colonization ability of Beauveria bassiana in maize plants and its influence on disease resistance of host plants. B. bassiana-maize symbiosis was constructed by root drenching method and chlorophyll and nitrogen content, as well as plant height were measured to evaluate the growth promoting effect of B. bassiana colonization in maize. The resistance of B. bassiana colonization against Exserohilum turcicum infection was investigated by inoculation of the disease. The colonization and spread of B. bassiana endophytic in maize plants under E. turcicum infection stress was studied by colony counting and quantitative PCR. The results showed that the colonization of B. bassiana in maize reached 68.18%, positively promoted plant growth and significantly reduced the incidence of B. bassiana by 46.67% at 21 day after inoculation. B. bassiana could be 'recruited' from the rhizosphere soil when maize leaves were infected by E. turcicum, and B. bassiana could accumulate at leaves in turn to improve resistance against plant pathogen infection. This study has further clarified the biocontrol potential of entomogenous fungi against plant diseases as endophyte, and provides a theoretical basis for the study of colonization and induced resistance of entomogenous fungi in plant tissues.

Key words: entomopathogenic fungi, endophytic, plant pathogen, recruitment function

CLC Number:

S476.1

SUI Li, LU Yang, CHI Ruikai, ZHAO Yu, ZHANG Zhengkun, LI Qiyun. Effects and Colonization of Beauveria bassiana in Maize under Stress of Exserohilum turcicum Infection[J]. Chinese Journal of Biological Control, 2023, 39(4): 804-812.

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