Abstract

PETIGROSSO, Lucas Ricardo; COMMATTEO, Jacqueline Giselle; FUERTES, Guadalupe  and  COVACEVICH, Fernanda. INTERACTION BETWEEN ENDOPHYTE AND MICORRHIZAL FUNGI IN FESTUCA ARUNDINACEA IN RESPONSE TO PHOSPHATE FERTILIZATION. Cienc. suelo [online]. 2022, vol.40, n.2, pp.159-166.  Epub Apr 21, 2023. ISSN 1850-2067.

Our objective was to evaluate the biomass production and partitioning of Festuca arundinacea (tall fescue) plants infected with endophyte Epichloë coenophiala and inoculated with arbuscular mycorrhizal fungi (HMA) in response to phosphate fertilization (P). For this, an experiment was carried out in pots in a growth chamber, through a completely randomized design with a factorial arrangement with 5 repetitions. The growth of F. arundinacea was evaluated in presence or not of E. coenophiala (SE- and SE+, respectively), inoculated with HMA (HMA+ and HMA-, with and without inoculation, respectively) and fertilized with phosphorus (P15 and P0, with and without fertilization, respectively). After 160 days of growth, the total fresh biomass (TFB) and its partitioning into aboveground (AFB) and belowground (BFB), and air dry weight (ADW) were quantified. Mycorrhizal colonization was quantified in roots. HMA+ plants showed lower BFT, BFA and BFR than HMA- plants in SE- and P0 conditions. No differences in BFT and PSA were detected between HMA+ and HMA- plants at P15. At P0, HMA- plants showed higher PFA than HMA+ plants. SE- plants showed higher PSA than SE+ plants. In SE+ plants inoculated with HMA for the P0 condition, abundant extraradical mycelium was recorded, although there was no evidence of interradical colonization or formation of arbuscules or vesicles. At P15, extraradical mycelium was observed around the roots (which were shorter than the roots of unfertilized plants) in only one sample of SE-. Under the conditions of the present experiment, expected responses in biomass production in plants infected with the endophyte fungus and inoculation with HMA and synergism between both symbionts were not recorded. Furthermore, no modulating effect of phosphate fertilization on the expected responses was found.

Keywords : tall fescue; Epichloë coenophiala; arbuscular mycorrhizal fungi; phosphorus..

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