| 5 | Benefits of a root fungal endophyte on physiological processes and growth of the vulnerable legume tree Prosopis chilensis(Fabaceae)显示文摘Aims Desertification is a major concern in arid and semi-arid regions globally.Understanding interactions between vulnerable plant spe-cies and associated microbial symbionts may have important appli-cations for conservation and restoration strategies in affected areas.Methods In this study,we evaluated the root-associated fungal endophyte community in Prosopis chilensis,a vulnerable and threatened arid-adapted tree of northern Chile.Host benefits in terms of physiologi-cal performance and plant growth were also assessed.Endophytic fungi were isolated from asymptomatic roots by the culture method for molecular identification of the 18S rRNA gene.The 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 measured.Important Findings WhereasΦ_(PSII) increased significantly in endophyte-inoculated plants,NPQ was found to decrease.No 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 increase.Results revealed that inoculation of endophytic Penicillium fungal isolate can provide significant physiological benefits to the host plant P.chilensis.Its presence resulted in greater _(PSII) efficiency and higher leaf nitrogen and carbohydrate content,enhancing host plant growth.These 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. | Marcia González-Teuber Alejandro Urzúa Andrea Morales Cristian Ibáñez Luisa Bascuñán-Godoy | 2019 | Journal of Plant Ecology2019，12，2： | 1 |
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