Abstract
The rhizosphere of plants are natural hosts for beneficial microorganisms such as plant growth-promoting rhizobacteria (PGPR) and arbuscular mycorrhizal fungi (AMF). The objective of this work was to determine the effect of a consortium of AMF and three strains of PGPR on growth, gas exchange and phosphorus content in poblano pepper plants. An experiment was established in a completely randomized design with factorial arrangement, with two factors: AMF [Funneliformis geosporum and Claroideoglomus sp. (AM) and without AM (WM)] and PGPR [Rhizobium nepotum (B1), Serratia plymuthica (B2), Pseudomonas tolaasii (B3) and without PGPR (WB)]; generating eight treatments: T1) AM+B1, T2) AM+B2, T3) AM+B3, T4) AM+WB, T5) WM+B1, T6) WM+B2, T7) WM+B3 and T8) WM+WB. Plant height, number of leaves, leaf area, number of flowers, dry biomass, phosphorus content and AMF colonization were measured; internal CO2 concentration (Ci), transpiration rate (E), stomatal conductance (gS) and photosynthesis rate (Pn) were determined in leaves. Co-inoculation with AM+B3 promoted greater height (35%), number of leaves (66%), leaf area (62%), dry biomass (140%), phosphorus content (195%) and mycorrhizal colonization (26%); AM+B2 improved Ci (5%), E (8%), gS (5%) and Pn (9%) in poblano pepper leaves, compared to the control treatment (WM+WB). Biofertilization with AMF and PGPR improved gas exchange and growth of poblano pepper.
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