title: Leaf gas exchange and chlorophyll a fluorescence in wheat plants supplied with silicon and infected with Pyricularia oryzae.
abstract: This study investigated the effect of silicon (Si) on the photosynthetic gas exchange parameters (net CO2 assimilation rate [A], stomatal conductance to water vapor [gs], internal CO2 concentration [Ci], and transpiration rate [E]) and chlorophyll fluorescence a parameters (maximum quantum quenching [Fv/Fm and Fv'/Fm'], photochemical [qP] and nonphotochemical [NPQ] quenching coefficients, and electron transport rate [ETR]) in wheat plants grown in a nutrient solution containing 0 mM (-Si) or 2 mM (+Si) Si and noninoculated or inoculated with Pyricularia oryzae. Blast severity decreased due to higher foliar Si concentration. For the inoculated +Si plants, A, gs, and E were significantly higher in contrast to the inoculated -Si plants. For the inoculated +Si plants, significant differences of Fv/Fm between the -Si and +Si plants occurred at 48, 96, and 120 h after inoculation (hai) and at 72, 96, and 120 hai for Fv'/Fm'. The Fv/Fm and Fv'/Fm', in addition to total chlorophyll concentration (a + b) and the chlorophyll a/b ratio, significantly decreased in the -Si plants compared with the +Si plants. Significant differences between the -Si and +Si inoculated plants occurred for qP, NPQ, and ETR. The supply of Si contributed to decrease blast severity in addition to improving gas exchange performance and causing less dysfunction at the photochemical level.
authors.forename: Carlos Eduardo Aucique
authors.initials: CE
authors.lastname: Perez
authors.forename: Fabrício Ávila
authors.initials: FÁ
authors.lastname: Rodrigues
authors.forename: Wiler Ribas
authors.initials: WR
authors.lastname: Moreira
authors.forename: Fábio Murilo
authors.initials: FM
authors.lastname: DaMatta
mesh_terms: D002245:Carbon Dioxide / Q000378:metabolism*; D002734:Chlorophyll / Q000378:metabolism; D000077194:Chlorophyll A; D020082:Magnaporthe / Q000502:physiology*; D010788:Photosynthesis / Q000187:drug effects; D045332:Photosystem II Protein Complex / Q000187:drug effects; D010935:Plant Diseases / Q000382:microbiology*; D018515:Plant Leaves / Q000187:drug effects / Q000382:microbiology / Q000502:physiology; D054046:Plant Stomata / Q000187:drug effects / Q000382:microbiology / Q000502:physiology; D018526:Plant Transpiration / Q000187:drug effects*; D012825:Silicon / Q000032:analysis / Q000378:metabolism / Q000494:pharmacology*; D014908:Triticum / Q000187:drug effects / Q000382:microbiology / Q000502:physiology*
chemical_list: D045332:Photosystem II Protein Complex; D002734:Chlorophyll; D002245:Carbon Dioxide; C037184:chlorophyll b; D000077194:Chlorophyll A; D012825:Silicon