Photosynthesis impairments and excitation energy dissipation on wheat plants supplied with silicon and infected with Pyricularia oryzae

dc.creatorAucique-Pérez, Carlos Eduardo
dc.creatorSilva, Paulo Eduardo de Menezes
dc.creatorMoreira, Wiler Ribas
dc.creatorDaMatta, Fábio Murilo
dc.creatorRodrigues, Fabrício Ávila
dc.date2018-03-15T17:26:54Z
dc.date2018-03-15T17:26:54Z
dc.date2017-10-26
dc.date.accessioned2023-09-27T20:56:02Z
dc.date.available2023-09-27T20:56:02Z
dc.identifier09819428
dc.identifierhttps://doi.org/10.1016/j.plaphy.2017.10.023
dc.identifierhttp://www.locus.ufv.br/handle/123456789/18271
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8951158
dc.descriptionConsidering the effect of silicon (Si) in reducing the blast symptoms on wheat in a scenario where the losses in the photosynthetic capacity of the infected plants is lowered, this study investigated the ability of using the incident light, the chloroplastidic pigments (chlorophylls and carotenoids) alterations and the possible role of carotenoids on the process of light dissipation on wheat plants non-supplied (-Si) or supplied (+Si) with Si and inoculated or not with Pyricularia oryzae. For + Si plants, blast severity was reduced compared to -Si plants. Reductions in the concentration of photosynthetic pigments (total chlorophyll, violanxanthin + antheraxanthin + zeaxanthin, β-carotene and lutein) were greater for inoculated -Si plants than for inoculated + Si ones. The α-carotene concentration increased for inoculated -Si and +Si plants in comparison to non-inoculated plants limiting, therefore, lutein production. Higher functional damage to the photosystem II (PSII) was noticed for inoculated -Si plants with reductions in the values of maximum quantum quenching, photochemical yield of PSII and electron transport rate, but higher values for quenching non-photochemical. This finding also contributed to reductions in the values of light saturated rate photosynthesis and light saturation point for -Si plants which was attenuated for inoculated + Si plants. Increase in dark respiration values occurred for inoculated plants than for non-inoculated ones. The Si supply to wheat plants, besides reducing blast severity, contributed to their better photosynthetic performance. Moreover, inoculated + Si plants coped with drastic losses of light energy dissipation processes (fluorescence and heat) by increasing the concentration of carotenoids which helped to maintain the structural and functional viability of the photosynthetic machinery minimizing, therefore, lipid peroxidation and the production of reactive oxygen species.
dc.formatpdf
dc.formatapplication/pdf
dc.languageeng
dc.publisherPlant Physiology and Biochemistry
dc.relationv. 121, p. 196-205, December 2017
dc.rightsElsevier Masson SAS
dc.subjectFungal disease
dc.subjectLight saturation point
dc.subjectPhotosynthesis
dc.subjectXanthophyll cycle
dc.titlePhotosynthesis impairments and excitation energy dissipation on wheat plants supplied with silicon and infected with Pyricularia oryzae
dc.typeArtigo


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