Inoculation with isolates of arbuscular mycorrhizal fungi influences growth, nutrient use efficiency and gas exchange traits in micropropagated apple rootstock ‘Marubakaido’

摘要: Apple rootstocks establish symbiosis with arbuscular mycorrhizal fungi (AMF), however the influence of fungal isolates on nutritional and physiological parameters are limited. The aim this work was to evaluate growth, nutrient uptake use efficiency, gas exchange apple micropropagated rootstock ‘Marubakaido’ inoculated four AMF differing levels phosphorus (P). We grew plantlets in a non-sterilized soil Acaulospora colombiana SCT115A, A. morrowiae SCT400B, Claroideoglomus etunicatum SCT101A, Gigaspora albida SCT200A, plus non-inoculated treatment at three P (0%, 50% e 100%). After 90 days inoculation, internal CO2 concentration (ci), transpiration rate (E), stomatal conductance (gs) photosynthetic (A) were evaluated after 315 days, total dry biomass, macro micronutrient contents colonization determined. regardless levels, decreased ci, E gs, increased intrinsic water efficiency (A/gs) (A/E). biomass results differed among isolates, where G. stood out increasing growth all P. also relative accumulation N, K, Ca, Mg, Cu B had lower rates. Nutrient higher plants compared control plants. In conclusion, although demonstrated positive depending concentration, we found evidence that has potential be used as inoculant production nurseries enhance tree performance. rootostocks increase nutrients content efficiency.