Participation of two carbonic anhydrases of the alpha family in photosynthetic reactions in Arabidopsis thaliana

The expression of genes of two carbonic anhydrases (CA) belonging to the a-family, α-CA2 and α-CA4 (according to the nomenclature in N. Fabre et al. (2007) Plant Cell Environ ., 30 , 617-629), was studied in arabidopsis (Arabidopsis thaliana, var. Columbia) leaves. The expression of the At2g28210 ge...

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Veröffentlicht in:Biochemistry (Moscow) 2016-10, Vol.81 (10), p.1182-1187
Hauptverfasser: Zhurikova, E. M., Ignatova, L. K., Rudenko, N. N., Mudrik, V. A., Vetoshkina, D. V., Ivanov, B. N.
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Sprache:eng
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Zusammenfassung:The expression of genes of two carbonic anhydrases (CA) belonging to the a-family, α-CA2 and α-CA4 (according to the nomenclature in N. Fabre et al. (2007) Plant Cell Environ ., 30 , 617-629), was studied in arabidopsis (Arabidopsis thaliana, var. Columbia) leaves. The expression of the At2g28210 gene coding α-CA2 decreased under increase in plant illumination, while the expression of the At4g20990 gene coding α-CA4 increased. Under conditions close to optimal for photosynthesis, in plants with gene At2g28210 knockout, the effective quantum yield of photosystem 2 and the light-induced accumulation of hydrogen peroxide in leaves were lower than in wild type plants, while the coefficient of non-photochemical quenching of leaf chlorophyll a fluorescence and the rate of CO 2 assimilation in leaves were higher. In plants with At4g20990 gene knockout, the same characteristics changed in opposite ways relative to wild type. Possible mechanisms of the participation of αa-CA2 and α-CA4 in photosynthetic reactions are discussed, taking into account that protons can be either consumed or released in the reactions they catalyze.
ISSN:0006-2979
1608-3040
DOI:10.1134/S0006297916100151