Original Paper

Acta Physiologiae Plantarum

, 29:309

First online:

The role of the photosynthetic apparatus in cold acclimation of Lolium multiflorum. Characteristics of novel genotypes low-sensitive to PSII over-reduction

  • M. RapaczAffiliated withFaculty of Agriculture and Economics, Department of Plant Physiology, Agricultural University of Cracow Email author 
  • , D. GąsiorAffiliated withFaculty of Agriculture and Economics, Department of Plant Physiology, Agricultural University of Cracow
  • , J. KościelniakAffiliated withFaculty of Agriculture and Economics, Department of Plant Physiology, Agricultural University of Cracow
  • , A. KosmalaAffiliated withInstitute of Plant Genetics, Polish Academy of Sciences
  • , Z. ZwierzykowskiAffiliated withInstitute of Plant Genetics, Polish Academy of Sciences
  • , M. W. HumphreysAffiliated withInstitute of Grassland and Environmental Research

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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.

Keywords

Chlorophyll fluorescence Freezing tolerance LoliumFestuca hybrids Photosynthesis PSII redox state Temperature perception