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Infrared thermography of in situ natural freezing and mechanism of winter-thermonasty in Rhododendron maximum

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dc.contributor.authorArora, Rajeeven
dc.contributor.authorWisniewski, Michaelen
dc.contributor.authorTuong, Tanen
dc.contributor.authorLivingston, Daviden
dc.date.accessioned2023-05-22T17:46:35Zen
dc.date.available2023-05-22T17:46:35Zen
dc.date.issued2023-03en
dc.description.abstractEvergreen leaves of Rhododendron species inhabiting temperate/montane climates are typically exposed to both high radiation and freezing temperatures during winter when photosynthetic biochemistry is severely inhibited. Cold-induced "thermonasty, " that is, lamina rolling and petiole curling, can reduce the amount of leaf area exposed to solar radiation and has been associated with photoprotection in overwintering rhododendrons. The present study was conducted on natural, mature plantings of a cold-hardy and large-leaved thermonastic North American species (Rhododendron maximum) during winter freezes. Infrared thermography was used to determine initial sites of ice formation, patterns of ice propagation, and dynamics of the freezing process in leaves to understand the temporal and mechanistic relationship between freezing and thermonasty. Results indicated that ice formation in whole plants is initiated in the stem, predominantly in the upper portions, and propagates in both directions from the original site. Ice formation in leaves initially occurred in the vascular tissue of the midrib and then propagated into other portions of the vascular system/venation. Ice was never observed to initiate or propagate into palisade, spongy mesophyll, or epidermal tissues. These observations, together with the leaf- and petiole-histology, and a simulation of the rolling effect of dehydrated leaves using a cellulose-based, paper-bilayer system, suggest that thermonasty occurs due to anisotropic contraction of cell wall cellulose fibers of adaxial versus abaxial surface as the cells lose water to ice present in vascular tissues.en
dc.description.adminPublic domain – authored by a U.S. government employeeen
dc.description.notesIowa Agriculture and Home Economics Experiment Station, Hatch Act and State of Iowa, Grant/Award Number: 3601en
dc.description.sponsorshipIowa Agriculture and Home Economics Experiment Station, Hatch Act and State of Iowa [3601]en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1111/ppl.13876en
dc.identifier.eissn1399-3054en
dc.identifier.issn0031-9317en
dc.identifier.issue2en
dc.identifier.pmid36808742en
dc.identifier.urihttp://hdl.handle.net/10919/115141en
dc.identifier.volume175en
dc.language.isoenen
dc.publisherWileyen
dc.rightsPublic Domain (U.S.)en
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/en
dc.subjectLeaf movementsen
dc.subjectice nucleationen
dc.subjectpropagationen
dc.subjectcolden
dc.subjecttemperatureen
dc.subjectplantsen
dc.subjectwateren
dc.subjectcatawbienseen
dc.subjectexpressionen
dc.subjectpatternen
dc.titleInfrared thermography of in situ natural freezing and mechanism of winter-thermonasty in Rhododendron maximumen
dc.title.serialPhysiologia Plantarumen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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