Daily dynamics of photosynthesis of the freshwater red alga Sirodotia delicatula (Batrachospermales, Rhodophyta)

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dc.contributor.authorKusakariba, Thiago [UNESP]
dc.contributor.authorNecchi Junior, Orlando [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T14:03:45Z
dc.date.available2014-05-20T14:03:45Z
dc.date.issued2009-12-01
dc.description.abstractP>The daily course of photosynthetic parameters of a population of the freshwater red alga Sirodotia delicatula from São Paulo State, Brazil (20 degrees 43'24 ' S, 49 degrees 18'21 ' W) was investigated under natural and laboratory conditions using dissolved oxygen and in vivo chlorophyll fluorescence techniques. Field specimens in laboratory conditions showed a defined daily pattern for net photosynthesis (NP) with two peaks observed in marine macroalgae and some freshwater red algae: the first (the highest) during the morning, and the second (the lowest and less evident) during the afternoon. Values of electron transport rate did not show a clear pattern of daily variation. NP results suggest the existence of an endogenous rhythm controlling photosynthesis. The study under natural conditions in two contrasting periods (autumn (June) and spring (October)) showed that the daily course of effective and potential quantum yield values was negatively correlated with irradiance and values were similar in the beginning and end of the day. These data evidenced, respectively, high excitement pressure on photosystem II and good recovery capacity (with lower values in spring) and a lack of irreversible photodamage to photosynthetic apparatus due to the prolonged exposure to high irradiances. Non-photochemical quenching values were also negatively correlated with the irradiance, suggesting a low dissipation capacity of excess energy absorbed by reaction centers. The results evidenced a typical pattern of daily variation with evident response to irradiance.en
dc.description.affiliationSão Paulo State Univ, Dept Bot & Zool, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
dc.description.affiliationUnespSão Paulo State Univ, Dept Bot & Zool, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFAPESP: 05/12476-5
dc.format.extent268-277
dc.identifierhttp://dx.doi.org/10.1111/j.1440-1835.2009.00546.x
dc.identifier.citationPhycological Research. Malden: Wiley-blackwell Publishing, Inc, v. 57, n. 4, p. 268-277, 2009.
dc.identifier.doi10.1111/j.1440-1835.2009.00546.x
dc.identifier.issn1322-0829
dc.identifier.lattes8973982859569408
dc.identifier.orcid0000-0001-7354-2124
dc.identifier.urihttp://hdl.handle.net/11449/22419
dc.identifier.wosWOS:000272533300003
dc.language.isoeng
dc.publisherWiley-Blackwell Publishing, Inc
dc.relation.ispartofPhycological Research
dc.relation.ispartofjcr1.275
dc.relation.ispartofsjr0,411
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectchlorophyll fluorescenceen
dc.subjectdaily variationen
dc.subjectdiurnal rhythmen
dc.subjectPhotosynthesisen
dc.titleDaily dynamics of photosynthesis of the freshwater red alga Sirodotia delicatula (Batrachospermales, Rhodophyta)en
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dcterms.rightsHolderWiley-blackwell Publishing, Inc
unesp.author.lattes8973982859569408[2]
unesp.author.orcid0000-0001-7354-2124[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências Letras e Ciências Exatas, São José do Rio Pretopt

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Artigos - Zoologia e Botânica - IBILCE