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Benefits of a root fungal endophyte on physiological processes and growth of the vulnerable legume tree Prosopis chilensis(Fabaceae)

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Journal of Plant Ecology 2019年第2期12卷 264-271页

作者： Marcia González-Teuber Alejandro Urzúa Andrea Morales Cristian Ibáñez Luisa Bascuñán-Godoy Max Planck Partner Group Departamento de Ciencias del AmbienteUniversidad de Santiago de ChileAv.Libertador Bernardo O'Higgins 3363SantiagoChile Instituto de Investigación Multidisciplinario en Ciencias y Tecnología Universidad de La SerenaAv.Raúl Bitrán 1305La SerenaChile Laboratorio de Química Ecológica Universidad de Santiago de ChileAv.Libertador Bernardo O'Higgins 3363SantiagoChile Departamento de Biología Universidad de La SerenaAv.Raúl Bitrán 1305La SerenaChile Departamento de Botánica Universidad de ConcepciónBarrio Universitario s/nConcepciónChile

Aims Desertification is a major concern in arid and semi-arid regions *** interactions between vulnerable plant spe-cies and associated microbial symbionts may have important appli-cations for conservation and restoration strategies in affected *** In this study,we evaluated the root-associated fungal endophyte community in Prosopis chilensis,a vulnerable and threatened arid-adapted tree of northern *** benefits in terms of physiologi-cal performance and plant growth were also *** fungi were isolated from asymptomatic roots by the culture method for molecular identification of the 18S rRNA *** dominant fungal endophyte(Penicillium sp.)in the community was later used in inoculation experiments to assess its effect on maximum quan-tum efficiency of photosystem II(_(PSII)),(Fv/Fm)actual _(PSII) efficiency(Φ_(PSII)),and non-photochemical quenching(NPQ).Total sugars,starch content,malonaldehyde(MDA),nitrogen content(%)and growth traits were also *** Findings WhereasΦ_(PSII) increased significantly in endophyte-inoculated plants,NPQ was found to *** effect of endophyte inocula-tion on sugars and MDA was detected,but starch content,leaf nitro-gen content,number of leaves and shoot biomass were found to *** revealed that inoculation of endophytic Penicillium fungal isolate can provide significant physiological benefits to the host plant *** presence resulted in greater _(PSII) efficiency and higher leaf nitrogen and carbohydrate content,enhancing host plant *** findings highlight the importance of consider-ing the fungal endophyte community of this vulnerable species as an important tool to the design of further revegetation and conserva-tion programs.

关键词： root endophytic fungi PSII efficiency nitrogen content plant growth promotion starch accumulation arid habitats

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