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Heat stress and recovery of photosystem II efficiency in wheat (<i>Triticum aestivum</i> L.) cultivars acclimated to different growth temperatures

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Authors:
  • Haque, Sabibul ;
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    Institut for Fødevarer - Planter, Fødevarer og Klima
  • Kjær, Katrine Heinsvig ;
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    Institut for Fødevarer - Planter, Fødevarer og Klima
  • Rosenqvist, Eva ;
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    Orcid logo0000-0001-9288-6248
    Section for Crop Sciences, Department of Plant and Environmental Sciences, Faculty of Science, Københavns Universitet
  • Sharma, Dew Kumari ;
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    Orcid logo0000-0001-5818-025X
    Section for Plant and Soil Sciences, Department of Plant and Environmental Sciences, Faculty of Science, Københavns Universitet
  • Ottosen, Carl-Otto
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    Institut for Fødevarer - Planter, Fødevarer og Klima
DOI:
10.1016/j.envexpbot.2013.10.017
Abstract:
The effect of heat stress on photosystem II (PS II) efficiency and post-stress recovery was studied in four wheat cultivars using chlorophyll fluorescence. The main aim was to examine the cultivar differences in relation to inhibition and recovery of PSII functionality after heat stress at different growth stages. The secondary aim was to investigate whether a pre-acclimation of plants to elevated temperature during the growth period induces a better tolerance to heat stress than for plants grown in ambient temperature or not. The plants were grown in two growth temperature conditions (15 °C and 25 °C) and subjected to heat stress (40 °C) for two days at early tillering and three days at anthesis and early grain development stages. The plants were returned to their original growth conditions after heat stress and recovery was observed for three days. The maximum photochemical efficiency (Fv/Fm) and the quantum yield of PSII (F′q/F′m) were measured before, during and after the heat stress. The heat stress significantly inhibited the Fv/Fm and F′q/F′m in all wheat cultivars at all growth stages. There were significant differences in Fv/Fm among the cultivars at anthesis and at early grain development but not at early tillering stage. However, the cultivars differed significantly in F′q/F′m at all growth stages. At anthesis and early grain development, the cultivar C518 had the lowest reduction in Fv/Fm and F′q/F′m after heat stress and recovered fully after 72 h in both growth conditions illustrating higher heat tolerance characteristics as compared to the other three cultivars. The largest decrease in Fv/Fm and F′q/F′m after heat stress occurred in the cultivar PWS7, which did not recover completely after 72 h. All cultivars grown at 25 °C had a slightly increased heat tolerance and better recovery compared to plants grown at 15 °C. The relative leaf chlorophyll content decreased significantly after heat stress in all cultivars at all growth stages. The elevated growth temperature (25 °C) accelerated plant growth resulting in early heading and reduced grain yield in comparison to ambient temperature (15 °C).
Type:
Journal article
Language:
English
Published in:
Environmental and Experimental Botany, 2014, Vol 99, p. 1-8
Keywords:
heat stress; Chlorophyll fluorescence; Wheat; relative leaf chlorophyll content; post-stress recovery; photosystem II; Heat stress; Relative leaf chlorophyll content; Post-stress recovery; Photosystem II
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2014
Scientific Level:
Scientific
ID:
256295106

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