PIGMENT CONTENT AND NET PHOTOSYNTHETIC PRODUCTIVITY OF MAIZE WHEN USING PLANT GROWTH REGULATORS
Abstract
The article deals with the results of studies on the effect of treatment of maize seeds with the plant growth regulators of natural origin on such parameters of photosynthetic productivity of corn plants as the content of photosynthetic pigments and net productivity of photosynthesis. It was found that the use of pre-sowing treatment of corn seeds with plant growth regulators contributed to the increase in the chlorophyll a and b content, their amount and carotenoid content from 6 to 20 % depending on the pigment and growth regulator. The chlorophyll a/b ratio ranged from 3.19 to 3.25. Determination of the chlorophyll a/b ratio showed that over the years of research in the experimental variants it was not significantly lower compared to the control variant and varied in the experimental variants depending on the type of regulator in the range from 3.19 to 3.25 (decrease relative to the control was 2–4 %). Determination of the ratio of the amount of chlorophylls (a+b)/carotenoids showed that this index in the experimental variants decreased to 5.70–6.11 (up to 8 %) compared to the control variant, where the ratio was 6.15. On the basis of the obtained data concerning the ratio of chlorophylls a/b and the amount of chlorophylls (a+b) to carotenoids, we can state that these indices testify to favorable conditions developed in the experimental variants of seed treatment with plant growth regulators, since the chlorophyll a/b ratio compared to the control variant was almost unchanged, and the ratio of the amount of chlorophylls (a+b) to carotenoids decreased against the control variant. Analysis of the experimental data also showed that the change in the net photosynthetic productivity index in the experimental variants was directly proportional to the change in the content of photosynthetic pigments. Thus, when corn seeds were treated before sowing with the Biosil PGR (20 ml/t), the net photosynthetic productivity index increased by 4 % compared to the control, while when using Biolan (50 ml/t) – by 11 %. The use of Regoplan (200 ml/t) and Zeastimulin (20 ml/t) appeared to be more effective for net photosynthetic productivity of corn plants. In these experimental variants the NFP index exceeded the results obtained in the control variant by 17 and 16 % according to the type of PGR. The regression analysis revealed a close correlation (r2=0,97) between the NFP index of chlorophyll content (a+b) in maize leaves, which is described by the following regression equation: y = 2.477x - 2.3181.
References
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