Endophytic mediation of reactive oxygen species and antioxidant activity in plants:a review  

作　　者：Cyd E.Hamilton P.E.Gundel M.Helander K.Saikkonen 

机构地区：[1]MTT Agrifood Research Finland,Plant Production Research,FI-31600 Jokioinen,Finland [2]IFEVA-CONICET-Faculty of Agronomy,Buenos Aires University(UBA),Buenos Aires,Argentina [3]Section of Ecology,Department of Biology,University of Turku,20014 Turku,Finland

出　　处：《Fungal Diversity》2012年第3期1-10,共10页真菌多样性（英文）

摘　　要：Reactive oxygen species are in all types of organisms from microbes to higher plants and animals.They are by-products of normal metabolism,such as photosynthesis and respiration,and are responsive to abiotic and biotic stress.Accumulating evidence suggests reactive oxygen species play a vital role in programmed cell death,stress responses,plant defense against pathogens and systemic stress signaling in conjunction with antioxidant production.Here,we propose that reactive oxygen species and antioxidants,as both universal and evolutionarily conserved,are likely to play important role(s)in symbiotic interactions.To support this hypothesis we review the root and foliar fungal endophyte literature specific to fungal-plant symbiotum production of reactive oxygen species and antioxidants in response to stress.These asymptomatic fungi can produce antioxidants in response to both biotic and abiotic stress when grown in culture as well as in planta.In addition,there is a growing but nascent literature reporting a significant impact of endophyte colonization on the antioxidant activity of colonized(E+)hosts when compared to uncolonized(E-)hosts,especially when exposed to stress.Here we summarize general patterns emerging from the growing literature specific to antioxidant activity of endophytes in colonized hosts and bring up possible future research questions and approaches.The consequences of changes in reactive oxygen species production and increased antioxidant activity in the symbiotum appear to be beneficial in many instances;but costs are also indicated.Unexplored questions are:1)to what extent do antioxidants originating from the fungal endophyte mediate host metabolism,and thereby control host responses to endophyte colonization;(2)what role do fungal,plant,or symbiotum produced reactive oxygen species and antioxidants have in determining symbiotic outcome between extremes of pathogenicity and mutualism;and(3)what role if any,do the production of reactive oxygen species and their antioxidant counterparts play in th

关 键 词：ENDOPHYTE SYMBIOSIS NEOTYPHODIUM Epichloë MUTUALISM Dark septate endophytes ANTAGONISM Stress Pathogen 

分 类 号：F42[经济管理—产业经济]