Formation of Photosynthetic Productivity of Soybean Crops for the Use of Different Types of Fungicides and Inoculants in the Right-Bank Forest-Steppe of Ukraine

Mostoviak, I.; Кравченко, О. В.

doi:10.31395/2310-0478-2018-21-21-24

Cited by 5 publications

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“…This can be explained by the decrease in the toxic effect of the applied to the seeds fungicide as the plant biomass increases, as well as by the activation of protective systems against the action of xenobiotics, and the positive role of fungicides in the protection against fungal phytopathogens. The latter, in particular, is indirectly confirmed by a significant increase of the chlorophyll index at the flowering stage of plants, whose seeds were treated with fungicides, compared with control (Tab 2), as well as by the literature data concerning the use of fungicides on soybean under field conditions (Mostoviak et al, 2018). These results are consistent with our previous studies, which found that fungicides inhibit the formation and functioning of soybean symbiotic systems at the early stages of plant development, and can shift the peak of nitrogen-fixing activity to later stages of ontogenesis (Pavlyshche et al, 2017).…”

Section: Photosynthetic Apparatus Capacity and Plant Productivitymentioning

confidence: 60%

Peculiarities of Formation and Functioning of the Soybean–bradyrhizobium Japonicum Symbiotic Apparatus in Relation to Photosynthetic Activity Under the Influence of Seed Protectants

Kots¹,

Kiriziy²,

Pavlyshche

et al. 2022

J microb biotech food sci

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The aim of work was to investigate the influence of seed treatment with two preparations of fungicidal action, differing in the active substances composition, on the formation and functioning of legume-rhizobial symbiosis in interaction with the photosynthetic apparatus of soybean plants. It was established that in plants treated with preparation Fever, the nitrogen-fixing activity (NFA) difference with the control was insignificant, but under the impact of the preparation Standak Top NFA was by 63% less at the stage of three true leaves, by 48% – at the stage of budding, and by 34% – at the stage of budding–flowering. The net photosynthetic rate, calculated per leaf area unit, was lower than control at all investigated stages of soybean plants development in the variants with the seed protectants applying. A fairly close positive correlations (R2 = 0.79) were observed between the average weight of one nodule and its NFA, and between the last and total NFA of the whole plant (R2 = 0.78). Close correlations between plant NFA, chlorophyll content in leaves, and net photosynthetic rate were revealed. It was concluded that seed protectants significantly influenced on nitrogen fixation and photosynthesis. The strength of manifestation, and the sign of this influence in comparison with the relevant parameters of the control plants depended on the preparation, the stage of plant development, as well as on the index (nodules formation, nitrogen-fixing activity, photosynthetic, chlorophyll content, chlorophyll index, biological productivity of soybean plants) under consideration.

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Section: Photosynthetic Apparatus Capacity and Plant Productivitymentioning

confidence: 60%

Peculiarities of Formation and Functioning of the Soybean–bradyrhizobium Japonicum Symbiotic Apparatus in Relation to Photosynthetic Activity Under the Influence of Seed Protectants

Kots¹,

Kiriziy²,

Pavlyshche

et al. 2022

J microb biotech food sci

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The influence of fungicidal protection on the formation of photosynthetic parameters of soybean crops

Mostypan,

Grabovskiy

2023

Agrobìologìâ

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The purpose of the research was to determine the effect of fungicidal protection on the formation of the leaf surface area and photosynthetic indicators of soybean crops. The research was conducted in 2021– 2023 in the conditions of LLC «Savarske» Obukhiv district Kyiv region. The scheme of the experiment: Factor A. Varieties «Amadea», «Aurelina». Factor B. Fungicides. Control (treatment of seeds and plants with water), «Maxim Advance 195 FS» (1.25 l/t) (treatment of seeds before sowing), «Vibrance RFC» (1 l/t) (seed treatment before sowing), «Selest top 312.5 FS» (1 l/t) (seed treatment before sowing), «Standak Top» (2 l/t) (seed treatment before sowing), «Abacus» (2 l/ha) (during the growing season), «Maxim Advance 195 FS» (1.25 l/t) + «Abacus» (2 l/ha), «Vibrance RFC» (1 l/t) +»Abacus» (2 l/ha), «Selest top 312.5 FS» (1 l/t) + «Abacus» (2 l/ha), «Standak Top» (2 l/t) + «Abacus» (2 l/ha). The maximum indicators of the leaf surface area of soybean plants of the varieties «Aurelina» and «Amadea» were obtained in the phase of grain formation – 44.85 and 45.91 thousand m2 /ha. The smallest assimilation surface of crops was in the budding phase – 15.10 and 15.07 thousand m2 /ha. Under the influence of fungicidal protection the leaf surface area of varieties «Amadea» and «Aurelina» increased by 0.90 and 0.94 thousand m2 /ha in the flowering phase and by 3.11 and 3.46 thousand m2 /ha in the phase of grain formation, compared to control variants. The greatest increase in leaf surface area was noted for the combined use of fungicides «Standak Top» (2 l/t) for pre-sowing seed treatment and «Abacus» (2 l/ha) during the growing season. According to the results of dispersion analysis varietal characteristics (37.7 %) and fungicidal protection (35.4 %) had the greatest influence on the formation of the leaf surface area of soybean plants and the interaction of these factors was 12.3 %. The highest photosynthetic potential of the varieties «Amadea» and «Aurelina» was on the variants of fungicides application «Standak Top» (2 l/t) + «Abacus» (2 l/ha) – 3.09 and 3.16 million m2 × days/ha, «Selest top» (1 l/ t) + «Abacus» (2 l/ha) – 3.08 and 3.14 million m2 × days/ha and «Vibrance» (1 l/t) + «Abacus» (2 l/ha) – 3.06 and 3.13 million m2 × days/ha. The maximum values of the net productivity of photosynthesis in the varieties «Amadea» and «Aurelina» were obtained in the budding phase – 3.88–4.16 and 3.89–4.27 g/m2 × day. The use of fungicidal protection provided an increase of this indicator by 0.07–0.28 and 0.06– 0.38 g/m2 × day, compared to the control options. Depending on the accounting periods, the variety «Aurelina» was superior to the variety «Amadea» in leaf surface area by 1.6–3.8 % in photosynthetic potential by 1.2–2.5 % and in net photosynthetic productivity by 0.8–1.7 %. Key words: soybean, varieties, fungicides, crop protection, leaf surface area, photosynthetic potential, net photosynthetic productivity.

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Forming Soybean Productivity Upon Seed Pre-Treatment With Fungicides Standak Top and Fever and Inoculation With Rhizobia on the Day of Sowing

Ya.

Kyrychenko

Pavlyshche

et al. 2021

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Soybean grain productivity is largely due to a complex of factors, in particular, the efficiency of symbiotic systems formed with nodule bacteria, the activity of growth processes and the formation of vegetative and generative organs by plants, as well as their adaptive plasticity under various environmental factors. The article presents the results of studying the peculiarities of the formation of soybean plant productivity upon seed pre-treatment with fungicides of different classes and inoculation with nodule bacteria on the day of sowing. Objective. To study the dynamics of seed germination, formation of vegetative and generative organs and soybean harvest, functioning of soybean-rhizobial symbiosis, as well as the state of photosynthetic pigment system — content of chlorophyll a and b and carotenoids in the leaves upon seed pre-treatment with fungicides Fever and Standak Top and bacterization with Bradyrhizobium japonicum 634b on the day of sowing. Methods. Microbiological, physiological, biochemical, statistical. Results. Fungicides did not exert toxicity in terms of seed germination, and soybean seed germination under the action of Fever exceeded parameters in the control plants by 20 % (at Day 5 after sowing) and by 7 % (at Day 8). It has been shown that fungicides increased plant height, aboveground mass and accelerated the formation of generative organs (flowers) by plants but did not significantly affect root mass. It was found that fungicides had a pronounced toxic (inhibitory) effect on soybean-rhizobial symbiosis upon seed pre-treatment: the process of nodule formation was suppressed in the initial stages of symbiosis, nitrogen fixation activity was lower than in the control plants by 80–48 % depending on soybean development phase. Thus, the effect of fungicides Fever and Standak Top upon seed pretreatment and inoculation with nodule bacteria on the day of sowing was characterized by significant suppression of functional activity of the symbiotic apparatus in the first half of soybean vegetation and its gradual recovery during formation of generative organs. Although fungicides inhibit the formation and functioning of legume-rhizobial symbiosis but their positive effect on the plant itself (seed germination, plant height, aboveground mass accumulation, dynamics of generative organ formation), as well as the ability of plants to adapt to stress at the biochemical level (stabilization of the content of photosynthetic pigments in the leaves) allowed to form a crop of soybean seeds at or slightly above the level of control. Conclusion. Physiological and biochemical features of the reaction of soybean-rhizobial symbiosis to the action of different fungicides that we had established must be taken into account in developing new strategies to protect plants from pathogens of various aetiologies with the involvement of physiologically active substances having fungicidal activity in combination with inoculation.

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Formation of Photosynthetic Productivity of Soybean Crops for the Use of Different Types of Fungicides and Inoculants in the Right-Bank Forest-Steppe of Ukraine

Cited by 5 publications

References 0 publications

Peculiarities of Formation and Functioning of the Soybean–bradyrhizobium Japonicum Symbiotic Apparatus in Relation to Photosynthetic Activity Under the Influence of Seed Protectants

Peculiarities of Formation and Functioning of the Soybean–bradyrhizobium Japonicum Symbiotic Apparatus in Relation to Photosynthetic Activity Under the Influence of Seed Protectants

The influence of fungicidal protection on the formation of photosynthetic parameters of soybean crops

Forming Soybean Productivity Upon Seed Pre-Treatment With Fungicides Standak Top and Fever and Inoculation With Rhizobia on the Day of Sowing

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