STRUCTURAL AND FUNCTIONAL REORGANIZATION OF PHOTOSYNTHETIC APPARATUS IN COLD ADAPTATION OF WHEAT PLANTS
Yu.V. Venzhik,1 A.F. Titov,1 V.V. Talanova,1 E.A. Miroslavov,2 N.K. Koteeva 2
1 Institute of Biology, Karelian Research Centre, Russian Academy of Sciences, Petrozavodsk,
2 Komarov Botanical Institute, Russian Academy of Sciences, Saint-Petersburg;
1 e-mail: Jul.Venzhik@gmail.com
The structural and functional characteristics of the photosynthetic apparatus (PSA) and the cold resistance of wheat seedlings were studied during low-temperature adaptation.
It was established that large chloroplasts with thylakoid system of "sun type" forme in the mesophyll cells in the early hours of plants hardening. At the same time the functional
reorganization of the PSA in the leaves of wheat occurs: content of pigments changes, stabilization of the pigment-protein complexes is observed, non-photochemical quenching of
excess energy increases. The stabilization of photosynthesis during cold adaptation occurs due to structural and functional reorganisation of the PSA. It is assumed that the reorganization
of the PSA is a prerequisite for formation of increased cold resistance of leaf cells, and this, along with other physiological and biochemical changes occurring in cells and tissues of plants,
allows the plants to survive in chilling.
Key words: Triticum aestivum L., cold adaptation, cold resistance, chloroplast ultrastructure, photosynthesis, pigments, chlorophyll fluorescence
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