Evaluation of cold stress of young industrial chicory (<Emphasis Type="Italic">Cichorium intybus</Emphasis> L.) plants by chlorophyll <Emphasis Type="Italic">a</Emphasis> fluorescence imaging. I. Light induction curve |
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Authors: | S?Devacht Email author" target="_blank">P?LootensEmail author J?Baert J?van?Waes E?van?Bockstaele I?Roldán-Ruiz |
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Institution: | (1) Department of Botany, University of Wisconsin-Madison, 430 Lincoln Drive, Madison, WI 53706, USA;(2) Department of Biochemistry and Molecular Biology, Michigan State University, 410 Biochemistry Building, East Lansing, MI 48824-1319, USA; |
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Abstract: | Industrial chicory, Cichorium intybus L., is cultivated for the production of inulin. Most varieties of industrial chicory exhibit rather poor early growth, which
limits further yield improvements in their European cultivation area. The poor early growth could be due to suboptimum adaptation
of the gene pool to growth at low temperatures, sometimes in combination with high light intensities, which is typical of
early-spring mornings. We have used chlorophyll (Chl) a fluorescence to evaluate the response of young plants of the cultivar ‘Hera’ to low temperatures and high light intensities.
Plants were grown at three temperatures: 16°C (reference), 8°C (intermediate), and 4°C (cold stress). Light-response measurements
were carried out at different light intensities in combination with different measurement temperatures. Parameters that quantify
the photosystem II (PSII) operating efficiency (including PSII maximum efficiency and PSII efficiency factor) and nonphotochemical
quenching (NPQ) are important to evaluate the stress in terms of severity, the photosynthetics processes affected, and acclimation
to lower growth temperatures. The results clearly demonstrate that in young industrial chicory plants the photosynthetic system
adapts to lower growth temperatures. However, to fully understand the plant response to the stresses studied and to evaluate
the long-term effect of the stress applied on the growth dynamics, the subsequent dark relaxation dynamics should also be
investigated. |
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