V.G. Kuryata,O.V.Buinyi,V.V. Rogach. Effect of gibberellin on morphogenesis, formation of photosynthetic apparatus and yield of tomatoes.

V.G. Kuryata


V.V. Rogach

Synthetic growth regulators are often used in agriculture, due to their ability to influence on morphogenesis and plant productivity. In particular, the effect of drugs of inhibitory action is well studied and described in literary sources, but the effect of growth stimulators, including gibberellins, requires a more detailed study.

The obtained results of the study indicate that gibberellic acid had a typical influence on the growth of tomato plants – significantly increased the height, total mass and mass of individual vegetative organs of the plant. Significant changes occurred in the photosynthetic apparatus: the number of leaves per plant increased, as well as the area of surface of individual leaves, which affected the productivity of plants. In addition, the thickness of chlorenchymes increased significantly. The leaf index, which characterizes the ratio of the area of ​​the leaf surface to the plot, significantly increased. At the same time, there was no significant increase in the chlorophyll index and the index of net productivity of photosynthesis. This evidences that the gibberellin action in plants increased the effectiveness of the photosynthetic apparatus precisely by increasing its total area.

The concentration of carbohydrates and reserve starch in the ontogenesis of plants decreased in vegetative organs, which may be caused by their outflow to the fruits. In general, in plants treated with gibberellin preparations, due to changes in the photosynthetic apparatus, there was an increase in the concentration of carbohydrates compared with the control. A similar situation was observed with the content of nitrogen. These results may indicate the role of vegetative parts of the plant in the supply of carbohydrates and nitrogen to fruits during the period of carpogenesis.

Changes in the photosynthetic apparatus, as well as the redistribution of assimilate streams in plants treated with gibberellin preparations, caused a significant increasing of the crop`s productivity. In particular, there is a significant increasing of yield of experimental plants by 30%. The results of the research indicate the high efficiency of the use of gibberellic drugs in order to control the increasing of the productivity of valuable crops, such as tomatoes.


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The action of 6-benzylaminopurine on the formation and functioning of the photosynthetic apparatus of tomatoes

UDC 631.8:635.64

O. Buinyi,
V. Kuryata,
V. Rogach.

We have investigated that by means of preparations the thickness of leaf has decreased due to reducing the thickness of the upper and lower epidermis and herewith there have not found significant differences in the thickness of chlorenchyma. The positive influence of preparation has appeared in the increasing of volume of the main photosynthetic tissue – parenchyma on 32% comparing with control. The growth of the amount of stomas on the abaxial surface of leaf on 15% has occurred by means of preparations that is very important for the optimization of gas exchange. We have investigated that the use of 6-BAP has led to the increasing of the amount and the area of leaf surface of the plants during the period of formation of fruit. The received results also suggests that using of 6-BAP has slowed the dying of leaves and as a result of it their amount in research variant at the end of the vegetation were bigger than in the control on 15%.
About the bigger power of photosynthetic apparatus by means of 6-BAP suggests the bigger mass of dry substance of leaves in the research variant comparing with control.
The results of our investigation suggests that by means of 6-BAP the leaf index has increased in the phase of fruiting. Under the influence of synthetic analogue of cytokines the content of chlorophyll in the leaves of Bobcat tomatoes increased to 0,87±0,04% against to 0,59±0,03% in control. Since, simultaneously with growth of the content of chlorophyll in the leaves, the leaf index of crops has increased and the chlorophyll index has raised.
We have also explored that by means of preparations a net productivity of photosynthesis has increased during the all period of the research.
The increasing of the leaf surface and the mass of leaves and the increased content of chlorophyll under the influence of 6-benzylaminopurine has formed more powerful photosynthetic apparatus. The growth of yielding capacity of culture tomatoes on 18% was the result of such changes of photosynthetic apparatus.

Keywords: tomatoes, 6-benzylaminopurine, chlorenchyma, the area of leaves, chlorophyll, yielding capacity.

The action of 6-benzylaminopurine on the formation and functioning of the photosynthetic apparatus of tomatoes.