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http://hdl.handle.net/1942/31446
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DC Field | Value | Language |
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dc.contributor.author | Ceusters, Nathalie | - |
dc.contributor.author | VALCKE, Roland | - |
dc.contributor.author | Frans, Mario | - |
dc.contributor.author | Claes, Johan E. | - |
dc.contributor.author | Van den Ende, Wim | - |
dc.contributor.author | CEUSTERS, Johan | - |
dc.date.accessioned | 2020-07-08T11:55:15Z | - |
dc.date.available | 2020-07-08T11:55:15Z | - |
dc.date.issued | 2019 | - |
dc.date.submitted | 2020-07-07T07:20:05Z | - |
dc.identifier.citation | Frontiers in plant science, 10 (Art N° 1012) | - |
dc.identifier.uri | http://hdl.handle.net/1942/31446 | - |
dc.description.abstract | Crassulacean acid metabolism (CAM) is a specialized mode of photosynthesis characterized by improved water use efficiency mediated by major nocturnal CO2 fixation. Due to its inherent metabolic plasticity CAM represents a successful physiological strategy for plant adaptation to abiotic stress. The present study reports on the impact of drought stress and different light intensities (PPFD 50 and 200 mu mol m(-2) s(-1)) on the photosynthetic performance of the obligate CAM orchid Phalaenopsis "Edessa" by integrating diet gas exchange patterns with assessments of the light reactions by analyzing fast chlorophyll a fluorescence induction. Parameters such as PIabs (performance index), different energy fluxes per active reaction centre (RC) reflecting the electron flow from photosystem II to photosystem I and the energetic communication between PSII complexes defined as connectivity were considered for the first time in a CAM plant. A higher PS II connectivity for plants grown under low light (p similar to 0.51) compared to plants grown under high light (p similar to 0.31) brought about similar specific energy fluxes of light absorbance, dissipation and processing through the electron transport chain, irrespective of the light treatment. With a 25% higher maximum quantum yield and comparable biomass formation, low light grown plants indeed proved to process light energy more efficiently compared to high light grown plants. The performance index was identified as a very reliable and sensitive parameter to indicate the onset and progress of drought stress. Under restricted CO2 availability (due to closed stomata) leaves showed higher energy dissipation and partial inactivation of PSII reaction centres to reduce the energy input to the electron transport chain and as such aid in avoiding overexcitation and photodamage. Especially during CAM idling there is a discrepancy between continuous input of light energy but severely reduced availability of both water and CO2, which represents the ultimate electron acceptor. Taken together, our results show a unique flexibility of CAM plants to optimize the light reactions under different environmental conditions in a dual way by either attenuating or increasing energy flux. | - |
dc.description.sponsorship | Research Fund KU Leuven. | - |
dc.language.iso | en | - |
dc.publisher | FRONTIERS MEDIA SA | - |
dc.rights | © 2019 Ceusters, Valcke, Frans, Claes, Van den Ende and Ceusters. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. | - |
dc.subject.other | chlorophyll fluorescence | - |
dc.subject.other | crassulacean acid metabolism | - |
dc.subject.other | Phalaenopsis | - |
dc.subject.other | performance index | - |
dc.subject.other | PSII connectivity | - |
dc.subject.other | specific energy fluxes | - |
dc.title | Performance Index and PSII Connectivity Under Drought and Contrasting Light Regimes in the CAM Orchid Phalaenopsis | - |
dc.type | Journal Contribution | - |
dc.identifier.volume | 10 | - |
local.bibliographicCitation.jcat | A1 | - |
dc.description.notes | Ceusters, J (reprint author), Katholieke Univ Leuven, Res Grp Sustainable Crop Prod 8 Protect, Dept Biosyst, Div Crop Biotech, Geel, Belgium.; Ceusters, J (reprint author), UHasselt, Ctr Environm Sci, Environm Biol, Diepenbeek, Belgium. | - |
dc.description.notes | johan.ceusters@kuleuven.be | - |
local.publisher.place | AVENUE DU TRIBUNAL FEDERAL 34, LAUSANNE, CH-1015, SWITZERLAND | - |
local.type.refereed | Refereed | - |
local.type.specified | Article | - |
local.bibliographicCitation.artnr | 1012 | - |
dc.source.type | Article | - |
dc.identifier.doi | 10.3389/fpls.2019.01012 | - |
dc.identifier.pmid | 31447875 | - |
dc.identifier.isi | WOS:000478872100001 | - |
dc.identifier.eissn | - | |
local.provider.type | wosris | - |
local.uhasselt.uhpub | yes | - |
item.contributor | Ceusters, Nathalie | - |
item.contributor | VALCKE, Roland | - |
item.contributor | Frans, Mario | - |
item.contributor | Claes, Johan E. | - |
item.contributor | Van den Ende, Wim | - |
item.contributor | CEUSTERS, Johan | - |
item.validation | ecoom 2020 | - |
item.fulltext | With Fulltext | - |
item.accessRights | Open Access | - |
item.fullcitation | Ceusters, Nathalie; VALCKE, Roland; Frans, Mario; Claes, Johan E.; Van den Ende, Wim & CEUSTERS, Johan (2019) Performance Index and PSII Connectivity Under Drought and Contrasting Light Regimes in the CAM Orchid Phalaenopsis. In: Frontiers in plant science, 10 (Art N° 1012). | - |
crisitem.journal.issn | 1664-462X | - |
crisitem.journal.eissn | 1664-462X | - |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
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fpls-10-01012.pdf | Published version | 3.13 MB | Adobe PDF | View/Open |
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