Abstract
The article sheds new light on the biochemical and molecular mechanisms that connect plant respiration, photosynthesis, and photorespiration. The activity of the main enzyme of the photorespiratory C2 cycle, a major pathway of plant primary metabolism 2-Phosphoglycolate (2PG) phosphatase (PGLP; EC 3.1.3.18) was studied in the leaves of wheat (Triticum aestivum L. and Triticum durum L.) and barley (Hordeum vulgare L.) genotypes that differ in drought tolerance and belong to the C3 pathway of photosynthesis. The highest PGLP activity was detected in Barakatli 95, Gobustan, Dayanatli and Garabag 22 genotypes. The obtained results revealed that Gobustan and Garabagh 22 genotypes can be cultivated in rainfed and semi-arid regions, and can be used as a starting material for creating stress-tolerant varieties in practical breeding programs. Keywords: Drought stress, 2-Phosphoglycolate phosphatase (PGLP), C3 cereals, plant breeding
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