The role of the photosynthetic apparatus in cold acclimation of <Emphasis Type="Italic">Lolium multiflorum</Emphasis>. Characteristics of novel genotypes low-sensitive to PSII over-reduction |
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Authors: | M Rapacz D Gąsior J Kościelniak A Kosmala Z Zwierzykowski M W Humphreys |
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Institution: | (1) Faculty of Agriculture and Economics, Department of Plant Physiology, Agricultural University of Cracow, Podłużna 3, 30-239 Kraków, Poland;(2) Institute of Plant Genetics, Polish Academy of Sciences, Strzeszyńska 34, 60-479 Poznań, Poland;(3) Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth, Ceredigion, SY23 3EB, UK |
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Abstract: | During cold acclimation by higher plants, temperature perception via changes in redox state of Photosystem II (PSII) and subsequent
acclimation of the photosynthetic apparatus to cold is very important for achieving freezing tolerance. These properties were
studied in two groups (A and B) of the same backcross 3 (BC3) progeny derived from a triploid hybrid of Festuca pratensis (2×) × Lolium multiflorum (4×) backcrossed three times onto diploid L. multiflorum cultivars. Leaves of Group A plants formed at 20°C at medium-low light were unable to acclimate their photosynthetic apparatus
to cold. Compared to Group B, the Group A plants were also more frost sensitive. This acclimation ability correlated with
the freezing tolerance of the plants. However, leaves of the same Group A plants developed at 20°C, but under higher-light
conditions had increased ability to acclimate their photosynthetic apparatus to cold. It was concluded that Group A plants
may have impaired PSII temperature perception, and this then resulted in their poor capability to cold acclimate. |
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Keywords: | Chlorophyll fluorescence Freezing tolerance Lolium– Festuca hybrids Photosynthesis PSII redox state Temperature perception |
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