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Implications of nighttime temperature on metamitron impacts on the photosynthetic machinery functioning of Malus x domestica Borkh

2021Artigo científico Acesso aberto
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dc.contributor.authorRosa, Nídia
dc.contributor.authorLidon, Fernando C.
dc.contributor.authorRodrigues, Ana P.
dc.contributor.authorPais, Isabel P.
dc.contributor.authorScotti-Campos, Paula
dc.contributor.authorAsín, Luís
dc.contributor.authorOliveira, Cristina M.
dc.contributor.authorRamalho, José C.
dc.date.accessioned2021-09-20T15:13:49Z
dc.date.available2021-09-20T15:13:49Z
dc.date.issued2021
dc.description.abstractMetamitron (MET) is a fruitlet thinning compound for apple trees, needing better understanding of its action on leaf energy metabolism, depending on nighttime temperature. A trial under environmental controlled conditions was set with ‘Golden Reinders’ potted trees, under 25/7.5 and 25/15 ◦C (diurnal/nighttime temperature), with (MET, 247.5 ppm) or without (CTR) application, and considering the monitoring of photosynthetic and respiration components from day 1 (D1) to 14 (D14). Net photosynthesis (Pn) decline promoted by MET after D1 was not stomatal related. Instead, non-stomatal constraints, reflected on the photosynthetic capacity (Amax), included a clear photosystem (PS) II inhibition (but barely of PSI), as shown by severe reductions in thylakoid electron transport at PSII level, maximal (Fv/Fm) and actual (Fv’/Fm’) PSII photochemical efficiencies, estimate of quantum yield of linear electron transport (Y(II)), and the rise in PSII photoinhibition status (Fs/Fm’ and PIChr) and uncontrolled energy dissipation (Y(NO)). To Pn inhibition also contributed the impact in RuBisCO along the entire experiment, regardless of night temperature, here reported for the first time. Globally, MET impact on the photosynthetic parameters was usually greater under 7.5 ◦C, with maximal impacts between D4 and D7, probably associated to a less active metabolism at lower temperature. Cellular energy metabolism was further impaired under 7.5 ◦C, through moderate inhibition of NADH-dependent malate dehydrogenase (MDH) and pyruvate kinase (PK) enzymes involved in respiration, in contrast with the increase of dark respiration in MET 7.5 until D7. The lower impact on PK and MDH under 15 ◦C and a likely global higher active metabolism at that temperature would agree with the lowest sucrose levels in MET 15 at D4 and D7. Our findings showed that MET alters the cell energy machinery in a temperature dependent manner, affecting the sucrose balance mainly at 15 ◦C, justifying the observed greater thinning potentialpt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationJournal of Plant Physiology 261 (2021) 153427pt_PT
dc.identifier.doihttps://doi.org/10.1016/j.jplph.2021.153427pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.5/21869
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationUID/AGR/04129/2020pt_PT
dc.relationUIDB/ 00239/2020pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectcarbon assimilationpt_PT
dc.subjectfruit thinningpt_PT
dc.subjectphotosynthesis inhibitionpt_PT
dc.subjectPSII functioningpt_PT
dc.subjectsoluble sugarspt_PT
dc.titleImplications of nighttime temperature on metamitron impacts on the photosynthetic machinery functioning of Malus x domestica Borkhpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.titleJournal of Plant Physiologypt_PT
person.familyNameMaria Moniz Simões de Oliveira
person.familyNameRamalho
person.givenNameCristina
person.givenNameJosé
person.identifier1111962
person.identifier.ciencia-id6115-7566-7CF9
person.identifier.ciencia-id2C14-07F8-4EFE
person.identifier.orcid0000-0002-3480-9380
person.identifier.orcid0000-0002-7639-7214
person.identifier.ridG-2427-2014
person.identifier.scopus-author-id57196449038
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationc0822746-e631-4826-a3d7-8964d00c6a9d
relation.isAuthorOfPublication2cedc58c-62ef-4973-a443-ebc72ae2ac4d
relation.isAuthorOfPublication.latestForDiscoveryc0822746-e631-4826-a3d7-8964d00c6a9d

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