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Reflectance indices as nondestructive indicators of the physiological status of Ceratonia siliqua seedlings under varying moisture and temperature regimes

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dc.contributor.authorOsório, Júlio
dc.contributor.authorOsório, Maria Leonor
dc.contributor.authorRomano, Anabela
dc.date.accessioned2015-06-18T10:12:38Z
dc.date.available2015-06-18T10:12:38Z
dc.date.issued2012
dc.description.abstractWe investigated the use of spectral reflectance techniques to monitor the physiological responses of Ceratonia siliqua L. seedlings exposed to different levels of water availability under normal (25 : 18 degrees C, day : night) and elevated (32 : 21 degrees C, day : night) temperatures. Three spectral reflectance indices (photochemical reflectance index, PRI; water index, WI; red edge position, REP) were measured along with water status, chlorophyll fluorescence and chlorophyll concentration variables in the leaves of well watered, moderately stressed, severely stressed and rehydrated plants under each temperature regime. The PSII effective photochemical efficiency (phi(2)) and the intrinsic efficiency of open PSII centres (F-v'/F-m') correlated significantly with PRI, and these three variables loaded heavily onto the same principal component of a three-factor principal component analysis solution. Water concentration (WC) and the succulence index (SI) were more strongly correlated with WI than either water potential (Psi(PD)) or relative water content (RWC). Accordingly, WI, WC and SI were combined in the second principal component, and Psi(PD) and RWC in the third. Our results provide clear evidence for interaction between water availability and temperature in the WI and the PRI response segments of the reflectance curves. Elevated temperature inhibited the recovery of WI spectral segments more than that of the PRI segments in SS plants. REP showed a strongly positive linear relationship with leaf total chlorophyll concentration across all water and temperature treatment combinations. PRI, WI and REP are therefore reliable markers that can be used to monitor phi(2), WC and total chlorophyll concentration, respectively, in C. siliqua seedlings under drought and temperature stress.
dc.identifier.doihttp://dx.doi.org/10.1071/FP11284
dc.identifier.issn1445-4408
dc.identifier.otherAUT: JOS01477; ARO01015;
dc.identifier.urihttp://hdl.handle.net/10400.1/6437
dc.language.isoeng
dc.peerreviewedyes
dc.publisherCSIRO Publishing
dc.relation.isbasedonP-002-G4P
dc.subjectChlorophyll a fluorescence
dc.subjectPhotochemical reflectance index
dc.subjectRed edge position
dc.subjectTemperature stress
dc.subjectWater index
dc.subjectWater stress
dc.titleReflectance indices as nondestructive indicators of the physiological status of Ceratonia siliqua seedlings under varying moisture and temperature regimes
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F35410%2F2007/PT
oaire.citation.endPage597
oaire.citation.issue7
oaire.citation.startPage588
oaire.citation.titleFunctional Plant Biology
oaire.citation.volume39
oaire.fundingStreamSFRH
person.familyNameOsório
person.familyNameOsório
person.familyNameRomano
person.givenNameJúlio
person.givenNameMaria Leonor
person.givenNameAnabela
person.identifier.ciencia-id8A18-7E9A-3B0E
person.identifier.orcid0000-0002-4054-4091
person.identifier.orcid0000-0002-7713-6497
person.identifier.orcid0000-0002-7204-7428
person.identifier.scopus-author-id9938818600
person.identifier.scopus-author-id7006394339
person.identifier.scopus-author-id56249997600
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
rcaap.typearticle
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relation.isAuthorOfPublication796eec66-f451-4ebf-938a-866b703df3ea
relation.isAuthorOfPublicatione3343b60-17d3-4f5e-a2bf-06f26da69206
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