title: Different mechanisms drive the performance of native and invasive woody species in response to leaf phosphorus supply during periods of drought stress and recovery.
abstract: The effects of drought stress and leaf phosphorus (Pi) supply on photosynthetic metabolism in woody tropical species are not known, and given the recent global environmental change models that forecast lower precipitation rates and periods of prolonged drought in tropical areas, this type of study is increasingly important. The effects of controlled drought stress and Pi supply on potted young plants of two woody species, Anadenanthera colubrina (native) and Prosopis juliflora (invasive), were determined by analyzing leaf photosynthetic metabolism, biochemical properties and water potential. In the maximum stress, both species showed higher leaf water potential (Ψl) in the treatment drought +Pi when compared with the respective control -Pi. The native species showed higher gas exchange under drought +Pi than under drought -Pi conditions, while the invasive species showed the same values between drought +Pi and -Pi. Drought affected the photochemical part of photosynthetic machinery more in the invasive species than in the native species. The invasive species showed higher leaf amino acid content and a lower leaf total protein content in both Pi treatments with drought. The two species showed different responses to the leaf Pi supply under water stress for several variables measured. In addition, the strong resilience of leaf gas exchange in the invasive species compared to the native species during the recovery period may be the result of higher efficiency of Pi use. The implications of this behavior for the success of this invasive species in semiarid environments are discussed.
authors.affiliation: Departamento de Botânica, Laboratório de Ecofisiologia Vegetal, Universidade Federal de Pernambuco, Recife PE 50670-901, Brasil.
authors.forename: Marciel Teixeira
authors.initials: MT
authors.lastname: Oliveira
authors.affiliation: Departamento de Botânica, Laboratório de Ecofisiologia Vegetal, Universidade Federal de Pernambuco, Recife PE 50670-901, Brasil.
authors.forename: Camila Dias
authors.initials: CD
authors.lastname: Medeiros
authors.affiliation: Departamento de Botânica, Laboratório de Ecofisiologia Vegetal, Universidade Federal de Pernambuco, Recife PE 50670-901, Brasil.
authors.forename: Gabriella
authors.initials: G
authors.lastname: Frosi
authors.affiliation: Departamento de Botânica, Laboratório de Ecofisiologia Vegetal, Universidade Federal de Pernambuco, Recife PE 50670-901, Brasil. Electronic address: mauro.gsantos@ufpe.br.
authors.forename: Mauro Guida
authors.initials: MG
authors.lastname: Santos
mesh_terms: D002734:Chlorophyll / Q000378:metabolism; D055864:Droughts; D058865:Introduced Species; D010758:Phosphorus / Q000378:metabolism*; D010788:Photosynthesis / Q000502:physiology; D018515:Plant Leaves / Q000378:metabolism* / Q000502:physiology; D018526:Plant Transpiration / Q000502:physiology
chemical_list: D002734:Chlorophyll; D010758:Phosphorus
keywords: Chlorophyll fluorescence; Climate change; Drought tolerance; Gas exchange; Water deficit