title: Symbiosis with AMF and leaf Pisupply increases water deficit tolerance of woody species from seasonal dry tropical forest.
abstract: In seasonal dry tropical forests, plants are subjected to severe water deficit, and the arbuscular mycorrhizal fungi (AMF) or inorganic phosphorus supply (Pi) can mitigate the effects of water deficit. This study aimed to assess the physiological performance of Poincianella pyramidalis subjected to water deficit in combination with arbuscular mycorrhizal fungi (AMF) and leaf inorganic phosphorus (Pi) supply. The experiment was conducted in a factorial arrangement of 2 water levels (+H2O and -H2O), 2 AMF levels (+AMF and -AMF) and 2Pilevels (+Piand -Pi). Leaf primary metabolism, dry shoot biomass and leaf mineral nutrients were evaluated. Inoculated AMF plants under well-watered and drought conditions had higher photosynthesis and higher shoot biomass. Under drought, AMF, Pior AMF+Piplants showed metabolic improvements in photosynthesis, leaf biochemistry and higher biomass compared to the plants under water deficit without AMF or Pi. After rehydration, those plants submitted to drought with AMF, Pior AMF+Pishowed a faster recovery of photosynthesis compared to treatment under water deficit without AMF or Pi. However, plants under the drought condition with AMF showed a higher net photosynthesis rate. These findings suggest that AMF, Pior AMF+Piincrease the drought tolerance in P. pyramidalis, and AMF associations under well-watered conditions increase shoot biomass and, under drought, promoted faster recovery of photosynthesis.
authors.affiliation: Departamento de Botânica, Universidade Federal de Pernambuco, Recife, PE 50670-901, Brazil.
authors.forename: Gabriella
authors.initials: G
authors.lastname: Frosi
authors.affiliation: Departamento de Botânica, Universidade Federal de Pernambuco, Recife, PE 50670-901, Brazil.
authors.forename: Vanessa A
authors.initials: VA
authors.lastname: Barros
authors.affiliation: Departamento de Botânica, Universidade Federal de Pernambuco, Recife, PE 50670-901, Brazil.
authors.forename: Marciel T
authors.initials: MT
authors.lastname: Oliveira
authors.affiliation: Departamento de Botânica, Universidade Federal de Pernambuco, Recife, PE 50670-901, Brazil.
authors.forename: Mariana
authors.initials: M
authors.lastname: Santos
authors.affiliation: Departamento de Botânica, Universidade Federal de Pernambuco, Recife, PE 50670-901, Brazil.
authors.forename: Diego G
authors.initials: DG
authors.lastname: Ramos
authors.affiliation: Departamento de Micologia, Universidade Federal de Pernambuco, Recife, PE 50670-901, Brazil.
authors.forename: Leonor C
authors.initials: LC
authors.lastname: Maia
authors.affiliation: Departamento de Botânica, Universidade Federal de Pernambuco, Recife, PE 50670-901, Brazil. Electronic address: mauro.gsantos@ufpe.br.
authors.forename: Mauro G
authors.initials: MG
authors.lastname: Santos
mesh_terms: D000222:Adaptation, Physiological; D018533:Biomass; D002734:Chlorophyll / Q000378:metabolism; D003890:Desiccation; D005453:Fluorescence; D065928:Forests; D005740:Gases / Q000378:metabolism; D008903:Minerals / Q000378:metabolism; D038821:Mycorrhizae / Q000502:physiology*; D010758:Phosphorus / Q000378:metabolism*; D010788:Photosynthesis; D010860:Pigments, Biological / Q000378:metabolism; D018515:Plant Leaves; D025341:Principal Component Analysis; D012621:Seasons; D013559:Symbiosis; D014197:Trees / Q000502:physiology*; D014329:Tropical Climate; D014867:Water / Q000378:metabolism*; D014934:Wood
chemical_list: D005740:Gases; D008903:Minerals; D010860:Pigments, Biological; D014867:Water; D002734:Chlorophyll; D010758:Phosphorus
keywords: Caatinga; Chlorophyll a fluorescence; Gas exchange; Mycorrhiza; Phosphorus; Plant biochemistry