Katashov Denis Aleksandrovich, Postgraduate student, Penza State University (40 Krasnaya street, Penza, Russia), firstname.lastname@example.org
Khryanin Viktor Nikolaevich, Doctor of biological sciences, professor, sub-department of botany, plant physiology and biochemistry, Penza State University (40 Krasnaya street, Penza, Russia), email@example.com
Background. The authors conducted experiments to elucidate the role of plant hormones and trace elements in changing pigment composition of leaves and photosynthetic productivity of rape plants. It is important to address the issue of productivity increase of the plant.
Materials and methods. The object of the study is rape (Brassica napus) of «Ratnik» kind, growing in field conditions. To determine leaf pigments the authors used the spectrophotometric method. The concentration of the pigment was calculated by the Lichtenhaler formula, 1987. Significance of the results was assessed using the Student's test.
Results. It is shown that treatment of plants by cytokinin (6-BAP ) increased the content of a and b chlorophyll at 40 % and 25 %, respectively, by sodium selenate – 12 % and 22 %, by brassinolide (BL) – only chlorophyll totaled 20 % as compared with the control. Chlorophyll a/b significantly increased due to treatment with gibberellins (GA) by 48–70 %, while the total chlorophyll content of plants of the present kind was lower than that of the control. Carotenoids content was not changed in treatment of plants by auxin (IAA), fusicoccin and sodium selenate, but somewhat decreased after treatment by 6-BAP (33 %), GA and BS. It is revealed that 6-BAP increases the ratio of the amount of chlorophyll to carotenoids twice, and BL – 60 %. Photosynthetic productivity was increased in plants treated with 6-BAP and BL by 25–38 % due to the increase in chlorophyll level and ratios of chlorophyll to carotenoids, and under the action of GA – 23 % due to improvement of the assimilation number, intensity of photosynthetic phosphorylation.
Conclusions. Increased productivity of rape under the influence of phytohormones (cytokinin, brassinolide and gibberellin) is caused both by increasing the number of seeds and seed weight per plant. Results of field experiments allow to recommend these plant hormones for use in crop production.
rape, plant hormones, sodium selenate, photosynthesis, pigments, chlorophyll, carotenoids, productivity.
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