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Photosynthesis, energy partitioning, and metabolic adjustments of the endangered Cistaceae species Tuberaria major under high temperature and drought

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dc.contributor.authorOsório, Maria Leonor
dc.contributor.authorOsório, Júlio
dc.contributor.authorRomano, Anabela
dc.date.accessioned2015-06-18T10:12:40Z
dc.date.available2015-06-18T10:12:40Z
dc.date.issued2013
dc.description.abstractIn view of predicted climatic changes for the Mediterranean region, study of high temperature and drought impacts on physiological responses of endangered species regains relevance. In this context, micropropagated plants of Tuberaria major, a critically endangered species, endemic of Algarve, were transferred to a controlled-environment cabinet with day/night temperatures set at 25/18A degrees C (Reference) or 32/21A degrees C (HT). After 15 days of HT acclimation, some plants were subjected to progressive drought followed by rewatering. The enhancement of temperature alone did not affect water relations and photosynthetic rates (P (N)) but the stomatal conductance (g (s)) exhibited a 3-fold increase in comparison with reference plants. The maximum quantum yield of photosystem (PS) II (F-v/F-m), the effective quantum yield of PSII photochemistry (I broken vertical bar(PSII)), carotenoid (Car) and anthocyanin content enhanced, whereas the quantum yields of regulated (I broken vertical bar(NPQ)) and nonregulated (I broken vertical bar(NO)) energy dissipation decreased. Drought combined with HT reduced predawn leaf water potential to values of about -1.3 MPa, which had adverse effects on gas exchange and PSII activity. Values of P (N) and g (s) were 71 and 79% lower than those of HT plants. An impairment of photochemical activity was also observed: the decrease in I broken vertical bar(PSII) and the increase of I broken vertical bar(NPQ). However, an irreversible photoinhibitory damage had not occurred. Carotenoid and anthocyanin content remained elevated and soluble sugars (SS) increased twice, whereas proline and MDA accumulation was not detected. On the first 24 h after water-stress relief, g (s), P (N), I broken vertical bar(PSII), and I broken vertical bar(NPQ) did not recover, but SS returned to the reference level. Overall, T. major acquired an adequate capacity for a protection against the development of oxidative stress during drought and water recovery under HT. These findings suggest that T. major is prepared to deal with predicted climate changes.
dc.identifier.doihttps://dx.doi.org/10.1007/s11099-012-0080-0
dc.identifier.issn0300-3604
dc.identifier.otherAUT: JOS01477; ARO01015;
dc.identifier.urihttp://hdl.handle.net/10400.1/6453
dc.language.isoeng
dc.peerreviewedyes
dc.publisherSpringer Verlag
dc.relation.isbasedonP-002-0AE
dc.subjectAnthocyanins
dc.subjectChlorophyll fluorescence imaging
dc.subjectEnergy partitioning
dc.subjectMalondialdehyde
dc.subjectProline
dc.subjectSoluble sugars
dc.titlePhotosynthesis, energy partitioning, and metabolic adjustments of the endangered Cistaceae species Tuberaria major under high temperature and drought
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage84
oaire.citation.issue1
oaire.citation.startPage75
oaire.citation.titlePhotosynthetica
oaire.citation.volume51
person.familyNameOsório
person.familyNameOsório
person.familyNameRomano
person.givenNameMaria Leonor
person.givenNameJúlio
person.givenNameAnabela
person.identifier.ciencia-id8A18-7E9A-3B0E
person.identifier.orcid0000-0002-7713-6497
person.identifier.orcid0000-0002-4054-4091
person.identifier.orcid0000-0002-7204-7428
person.identifier.scopus-author-id7006394339
person.identifier.scopus-author-id9938818600
person.identifier.scopus-author-id56249997600
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublication796eec66-f451-4ebf-938a-866b703df3ea
relation.isAuthorOfPublicationf4547ef6-b9f9-49e6-a7b3-ad71f623cfdf
relation.isAuthorOfPublicatione3343b60-17d3-4f5e-a2bf-06f26da69206
relation.isAuthorOfPublication.latestForDiscoverye3343b60-17d3-4f5e-a2bf-06f26da69206

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