Fiziol. rast. genet. 2023, vol. 55, no. 6, 539-547, doi:

Drought influence on pigments of xanthophyll cycle in winter wheat leaves

Priadkina G.O.1, Makharynska N.M.1, Kedruk A.S.1, Kharkhota M.A.2

  1. Institute of Plant Physiology and Genetics, National Academy of Sciences of Ukraine  31/17 Vasylkivska St., Kyiv, 03022, Ukraine
  2. D.K. Zabolotny Institute of Microbiology and Virology, National Academy of Sciences of Ukraine 154 Academic Zabolotny St., Kyiv, 03680, Ukraine

Drought is one of the main factors in the reduction and significant annual variability of agricultural production worldwide. Wheat, one of the world’s most important food crops, is sensitive to this stressor. Currently, improvement of photosynthetic efficiency is considered as a promising strategy for increasing the potential of wheat grain productivity. The aim of our work was to investigate the effect of a one-week drought during the flowering period on the content and ratio of xanthophylls of the violaxanthin cycle, which are involved in the protection of the photosynthetic apparatus from excess absorbed solar energy. It was found that the total pool of violaxanthin cycle pigments in flag leaves of plants in the variant with sufficient water supply (70 % of field capacity) and under the conditions of a one-week drought (30 % of field capacity) did not differ significantly. However, the content of individual xanthophylls and the ratio between epoxidized and de-epoxidized pigments of the cycle on the 7th day of drought changed significantly. In bright sunlight under drought, the violaxanthin content was 10 % lower than under conditions of sufficient moisture. The content of deepoxidized cycle pigments — zeaxanthin and antheraxanthin, on the contrary, increased by 22 and 18 %, respectively. As a result, the ratio between epoxidized and de-epoxidized pigments in cycle increased under drought conditions. An increase in the degree of the cycle deepoxidation under conditions of moisture deficiency in the soil indicates greater losses of absorbed solar energy in non-photochemical reactions and less it use in photochemical processes, that leads to a decrease in the efficiency of photosynthesis under stress conditions. The decrease in the grain productivity of the main shoot and the whole winter wheat plant under drought treatment compared to the sufficient water supply indicates that efficiency of photosynthesis is one of the factors that determine the wheat productivity.

Keywords: Triticum aestivum L., drought, chlorophyll, xanthophyll cycle, deepoxidation

Fiziol. rast. genet.
2023, vol. 55, no. 6, 539-547

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