Abstract
Photosynthesis occurring in chlorenchymal tissues of lignified branches of perennial plants (cortical photosynthesis) has a significant impact on their productivity and resistance to adverse environmental conditions, such as water deficiency and low temperatures. Cortical photosynthesis occurring under the outer bark of a lignified grape vine can become a convenient marker for breeding freeze-tolerant varieties. The following approaches can be undertaken to assess the functional state of the cortical photosynthetic apparatus: (1) analysis of the variable chlorophyll fluorescence parameters and (2) biochemical analysis of photosynthetic membrane preparations. To evaluate these approaches, in this work we have carried out the comparative analysis of characteristics of the cortical photosynthetic apparatus in grape varieties differing in freeze tolerance. This work was supported by grant №18-04-00079 from the Russian Foundation for Basic Research.
Highlights
The ability to absorb light energy and convert it into the energy of chemical bonds is present in young green shoots, and in lignified branches and trunks in tissues below the outer bark [1,2,3,4,5]
It has been established that photosynthesis in the chlorenchymal tissues of the inner cortex of lignified plant organs, so-called "corticular photosynthesis" (CP), contributes to the carbon balance of the plant, radial growth of the stem, accumulation of bud biomass and the formation of young leaves [6,7]
The oxygen released in the CP process prevents hypoxia and maintains respiration, which can be especially important for the survival of plants at low temperatures during long winters
Summary
The ability to absorb light energy and convert it into the energy of chemical bonds is present in young green shoots, and in lignified branches and trunks in tissues below the outer bark [1,2,3,4,5]. The structural and functional characteristics of the cortical photosynthetic apparatus can become a convenient marker for the selection for highly productive and freeze tolerant grape varieties.
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