CHANGES IN NET PHOTOSYNTHETIC PRODUCTIVITY AND PHOTOSYNTHETIC PIGMENT CONTENT OF REGENERATIVELY CULTIVATED WHEAT ACROSS DEVELOPMENTAL STAGES

N. Umerova; R. Kurbonova; U. Jumanov; Sh. Payonov

Authors

N. Umerova Gulistan State University Research Institute of Grain and Leguminous Crops, Surkhandarya Scientific Experimental Station
R. Kurbonova Gulistan State University Research Institute of Grain and Leguminous Crops, Surkhandarya Scientific Experimental Station
U. Jumanov Gulistan State University Research Institute of Grain and Leguminous Crops, Surkhandarya Scientific Experimental Station
Sh. Payonov Gulistan State University Research Institute of Grain and Leguminous Crops, Surkhandarya Scientific Experimental Station

Keywords:

Keywords: winter bread wheat, regenerative agriculture, photosynthesis, net photosynthetic productivity, photosynthetic pigments, chlorophyll a, chlorophyll b, carotenoids, MicroBioVak, organic fertilizer, differential fertilization, photosynthetic apparatus, antioxidant system, physiological activity, productivity.

Abstract

Abstract.This study investigated the effects of different agronomic practices on the photosynthetic activity and synthesis of photosynthetic pigments in winter bread wheat cultivated under regenerative agricultural technologies. The experiment included four treatments: control, organic fertilizer application, the MicroBioVak biological preparation, and differential fertilization based on soil analysis. The obtained results demonstrated that net photosynthetic productivity and the content of photosynthetic pigments varied depending on both the developmental stage of wheat and the applied agro-technological practices. The highest values of net photosynthetic productivity were recorded in the differential fertilization treatment, reaching 7.84 g m⁻² day⁻¹ during the heading stage and 5.32 g m⁻² day⁻¹ during the milk ripening stage. The application of MicroBioVak increased photosynthetic productivity by 18.7% during the stem elongation stage, indicating high efficiency during the early phases of vegetative growth. Analysis of photosynthetic pigments revealed that the MicroBioVak treatment was the most effective in increasing chlorophyll b and total chlorophyll content, whereas the organic fertilizer treatment strongly stimulated carotenoid synthesis. The findings confirm that regenerative agricultural technologies play an important role in improving the functioning of the photosynthetic apparatus, enhancing physiological stability, and accelerating yield formation in wheat.

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