Abstract
Abstract Currently, the mechanism of root uptake of carbon dioxide (CO 2 ) by plants and the factors influencing it are poorly understood in the scientific literature. The aim of the work was to establish the influence of external factors on the emission and absorption of CO 2 by the roots and leafs of experimental plants. The research was carried out using the author's installation of vertically differentiated accounting of CO 2 fluxes in the soil–plant-atmosphere system, equipped with CO 2 sensors in hermetically isolated leaf and root chambers. Maize plants in the amount of 19 pieces were used as the object. The model experiment lasted for 40 days, in which four different modes (A-D) were studied, reflecting the influence of external factors on the carbon nutrition of plants. In the “A” mode, the pattern of changes in leaf and root CO 2 absorption was studied depending on the light regime. An inverse correlation (r = -0.859) was established between the dynamics of CO 2 concentrations in the leaf and root chambers during the change of the light phase (16 h) to the night phase (8 h), which allows us to consider the mechanism of root carbon nutrition as an alternative source of CO 2 nutrition for plants. It was also found that the mechanism of root CO 2 absorption is activated in the light phase when the atmospheric CO 2 concentration reaches 417–367 ppm. In the “B” mode, a model of transformation of carbon nutrition of plants using nitrogen fertilizers was considered. It was found that in the first 3 days, fertilizing with ammonium nitrate leads to increased respiration of leaves at night and to a decrease in absorption capacity during the daytime. The absorption capacity of the leaves is reduced from 70.4 ppm to 92.3 ppm, compared with the indicator of mode “A”. In the “C” mode, the effect of different levels of illumination intensity on the carbon nutrition of plants was studied. With a twofold increase in illumination intensity (from 1750 to 3500 lx), after the transition to the dark phase, there is a delay in response (the beginning of leaf respiration) for 80 min. In the “D” mode, the behavior of the root carbon nutrition of plants is studied with a possible increase in CO 2 in the atmosphere, for example, with an increase in the intensity of soil respiration. It was found that as the concentration of CO 2 in the atmosphere of the leaf chamber increases (500–1500 ppm), its absorption by the root system stops.
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Claims 7
Claim · model-written summary
An inverse correlation between leaf and root chamber CO2 dynamics was found in maize when the light phase changed to the night phase.
- Treatment
- change of the light phase (16 h) to the night phase (8 h)e2
- Outcome
- dynamics of CO 2 concentrations in the leaf and root chamberse2
- Direction
- inversee2
- Value
- r = -0.859e2
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize plants in the amount of 19 pieces were used as the object”
e2“An inverse correlation (r = -0.859) was established between the dynamics of CO 2 concentrations in the leaf and root chambers during the change of the light phase (16 h) to the night phase (8 h)”
Claim · model-written summary
Root CO2 absorption in maize was activated in the light phase when atmospheric CO2 reached 417–367 ppm.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize plants in the amount of 19 pieces were used as the object”
e1“the mechanism of root CO 2 absorption is activated in the light phase when the atmospheric CO 2 concentration reaches 417–367 ppm”
Claim · model-written summary
Fertilizing maize with ammonium nitrate increased leaf respiration at night during the first 3 days.
- Treatment
- fertilizing with ammonium nitratee3
- Outcome
- respiration of leaves at nighte3
- Direction
- increasede3
- Qualifier
- in the first 3 dayse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize plants in the amount of 19 pieces were used as the object”
e3“in the first 3 days, fertilizing with ammonium nitrate leads to increased respiration of leaves at night and to a decrease in absorption capacity during the daytime”
Claim · model-written summary
Fertilizing maize with ammonium nitrate decreased leaf absorption capacity during the daytime in the first 3 days.
- Treatment
- fertilizing with ammonium nitratee3
- Outcome
- absorption capacity during the daytimee3
- Direction
- decreasee3
- Qualifier
- in the first 3 dayse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize plants in the amount of 19 pieces were used as the object”
e3“in the first 3 days, fertilizing with ammonium nitrate leads to increased respiration of leaves at night and to a decrease in absorption capacity during the daytime”
Claim · model-written summary
Leaf absorption capacity of maize under ammonium nitrate fertilization was reduced from 70.4 ppm to 92.3 ppm compared with mode A.
- Treatment
- fertilizing with ammonium nitratee3
- Outcome
- absorption capacity of the leavese4
- Direction
- reducede4
- Value
- 70.4 ppm to 92.3 ppme4
- Comparator
- the indicator of modee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize plants in the amount of 19 pieces were used as the object”
e3“in the first 3 days, fertilizing with ammonium nitrate leads to increased respiration of leaves at night and to a decrease in absorption capacity during the daytime”
e4“The absorption capacity of the leaves is reduced from 70.4 ppm to 92.3 ppm, compared with the indicator of mode”
Claim · model-written summary
A twofold increase in illumination delayed the start of leaf respiration in maize after darkness by 80 min.
- Treatment
- twofold increase in illumination intensity (from 1750 to 3500 lx)e5
- Outcome
- response (the beginning of leaf respiration)e5
- Direction
- delaye5
- Value
- 80 mine5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize plants in the amount of 19 pieces were used as the object”
e5“With a twofold increase in illumination intensity (from 1750 to 3500 lx), after the transition to the dark phase, there is a delay in response (the beginning of leaf respiration) for 80 min”
Claim · model-written summary
Increasing atmospheric CO2 in the leaf chamber from 500 to 1500 ppm stopped root absorption of CO2 in maize.
- Treatment
- concentration of CO 2 in the atmosphere of the leaf chambere6
- Outcome
- absorption by the root systeme6
- Direction
- decreaseinferrede6
- Value
- 500–1500 ppme6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize plants in the amount of 19 pieces were used as the object”
e6“as the concentration of CO 2 in the atmosphere of the leaf chamber increases (500–1500 ppm), its absorption by the root system stops”
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