title: Physiological significance of isoprenoids and phenylpropanoids in drought response of Arundinoideae species with contrasting habitats and metabolism.
abstract: Physiological, biochemical and morpho-anatomical traits that determine the phenotypic plasticity of plants under drought were tested in two Arundinoideae with contrasting habitats, growth traits and metabolism: the fast-growing Arundo donax, which also is a strong isoprene emitter, and the slow-growing Hakonechloa macra that does not invest on isoprene biosynthesis. In control conditions, A. donax displayed not only higher photosynthesis but also higher concentration of carotenoids and lower phenylpropanoid content than H. macra. In drought-stressed plants, photosynthesis was similarly inhibited in both species, but substantially recovered only in A. donax after rewatering. Decline of photochemical and biochemical parameters, increased concentration of CO2 inside leaves, and impairment of chloroplast ultrastructure were only observed in H. macra indicating damage of photosynthetic machinery under drought. It is suggested that volatile and non-volatile isoprenoids produced by A. donax efficiently preserve the chloroplasts from transient drought damage, while H. macra invests on phenylpropanoids that are less efficient in preserving photosynthesis but likely offer better antioxidant protection under prolonged stress.
authors.affiliation: Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria. violet@bio21.bas.bg.|Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy. violet@bio21.bas.bg.
authors.forename: Violeta
authors.initials: V
authors.lastname: Velikova
authors.affiliation: Trees and Timber Institute, The National Research Council of Italy (CNR), Via Madonna del Piano 10, Sesto Fiorentino, 50019, Florence, Italy.|Department of Plant, Soil and Environmental Sciences, University of Florence, Viale delle Idee 30, Sesto Fiorentino, 50019, Florence, Italy.
authors.forename: Cecilia
authors.initials: C
authors.lastname: Brunetti
authors.affiliation: Institute for Sustainable Plant Protection, Department of Biology, Agriculture and Food Sciences, The National Research Council of Italy (CNR), Sesto Fiorentino, 50019, Florence, Italy.
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Tattini
authors.affiliation: Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria.
authors.forename: Dilyana
authors.initials: D
authors.lastname: Doneva
authors.affiliation: Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy.|Institute of Ecology, University of Innsbruck, Austria.
authors.forename: Mastaneh
authors.initials: M
authors.lastname: Ahrar
authors.affiliation: Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria.
authors.forename: Tsonko
authors.initials: T
authors.lastname: Tsonev
authors.affiliation: Faculty of Biology, Sofia University, 1113, Sofia, Bulgaria.
authors.forename: Miroslava
authors.initials: M
authors.lastname: Stefanova
authors.affiliation: Faculty of Biology, Sofia University, 1113, Sofia, Bulgaria.
authors.forename: Tsveta
authors.initials: T
authors.lastname: Ganeva
authors.affiliation: Department of Plant, Soil and Environmental Sciences, University of Florence, Viale delle Idee 30, Sesto Fiorentino, 50019, Florence, Italy.
authors.forename: Antonella
authors.initials: A
authors.lastname: Gori
authors.affiliation: Department of Plant, Soil and Environmental Sciences, University of Florence, Viale delle Idee 30, Sesto Fiorentino, 50019, Florence, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Ferrini
authors.affiliation: Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy.
authors.forename: Claudio
authors.initials: C
authors.lastname: Varotto
authors.affiliation: Department of Biology, Agriculture and Food Sciences, The National Research Council of Italy (CNR), 00185, Rome, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Loreto
mesh_terms: D000040:Abscisic Acid / Q000378:metabolism; D047310:Apigenin / Q000378:metabolism; D002070:Butadienes / Q000378:metabolism*; D002338:Carotenoids / Q000378:metabolism; D002734:Chlorophyll / Q000378:metabolism; D002736:Chloroplasts / Q000648:ultrastructure; D003373:Coumaric Acids / Q000378:metabolism*; D003681:Dehydration / Q000378:metabolism; D055864:Droughts; D017753:Ecosystem; D045782:Hemiterpenes / Q000378:metabolism*; D047311:Luteolin / Q000378:metabolism; D010420:Pentanes / Q000378:metabolism*; D010788:Photosynthesis; D006109:Poaceae / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure; D014867:Water / Q000378:metabolism
chemical_list: D002070:Butadienes; D003373:Coumaric Acids; D045782:Hemiterpenes; D010420:Pentanes; D014867:Water; C005059:isoprene; D002734:Chlorophyll; D002338:Carotenoids; D000040:Abscisic Acid; D047310:Apigenin; D047311:Luteolin
keywords: Arundo donax; Hakonechloa macra; abscisic acid; chloroplast ultrastructure; isoprene; leaf anatomy; xanthophylls