Book of proceedings of the All-Russian Scientific Conference with International Participation and Schools of Young Scientists "Mechanisms of resistance of plants and microorganisms to unfavorable environmental" (parts I, II), Jul 1, 2018
The application of nutrient-rich substrates to soils characterized by low natural fertility is di... more The application of nutrient-rich substrates to soils characterized by low natural fertility is discussed as a strategy to improve soil fertility and, consequently, affect plant physiological traits. This study aimed to evaluate if sodium lignosulfonate (LS), a by-products of pulp and paper industry, may improve plant ecophysiological traits under contrasting nutrient conditions. A pot culture experiment was conducted with cucumber plants, using LS concentrations of 0, 1, 2.5, 5, and 10 vol.% in sandy soil, and two soil nutrient levels: sufficient and low nutrient availability (SNA and LNA, accordingly). The LS increased N and P content in SNA leaves when 1% of LS was used and decreased N content in LNA leaves regardless of soil LS content. The LS did reduce mass-, N-, and P-based respiration rates of the SNA leaves, and increased the N-based respiration rate under LNA. The LS did not have a significant impact on the ratio of respiration to photosynthesis in SNA leaves, but decreased it under LNA. The LS application contributed to a slight activation of some physiological processes in LNA plants, but it was not successful to recover these activities to the level of plants grown under SNA.
In greenhouse production a temperature drop concept has become an important tool to control stem ... more In greenhouse production a temperature drop concept has become an important tool to control stem elongation of a number of ornamental plant species, bedding plants and vegetable transplants. This concept takes advantage of the fact that, in many species, plant stem elongation is sensitive to a short diurnal temperature drop in the morning or in the end of the night. Here, the role of light in cucumber plant (Cucumis sativus L.) response to a diurnal temperature drop has been investigated. Plants were grown under relatively "low" (120 µmol m-2 s-1 PPFD) or "high" (320 µmol m-2 s-1 PPFD) light intensity. The effect of a 2 h temperature drop from 23° to 9°C, either in the end of the night (in darkness) or in the beginning of the day (in light) on plant growth, photosynthetic and respiratory activity was studied. Light-demanding and shade-tolerant cucumber hybrids were used in experiments. The results showed differential temperature regulation of plant morphology and photosynthetic activity in light and darkness. A temperature drop in the light led to more pronounced decrease in biometric and photosynthetic parameters of plants than a temperature drop in darkness. Light intensity during plant growth also modified plant response to a temperature drop. In particular, a temperature drop in the night led to a decrease in photosynthetic activity only in plants grown under "low" light. The respiration of the leaves, on the contrary, was intensified as a result of a temperature drop in plants grown under "high" light. Light-demanding and shade-tolerant hybrids had generally similar response to a temperature drop, but some differences were also revealed. Thus, the degree of light inhibition of mitochondrial respiration decreased due to a temperature drop only in the leaves of light-demanding hybrids. They also demonstrated greater reduction of photosynthetic pigment content in response to a temperature drop compared to shade-tolerant plants. This suggests that plant response to a diurnal short-term temperature drop depends to large extend on the timing of the drop treatment (in light or darkness) and light growing conditions. The degree of plant light demand may also be important.
This study investigates the effect of daily short-term (2 h) low temperature treatment (12 C) (D... more This study investigates the effect of daily short-term (2 h) low temperature treatment (12 C) (DROP) on photosynthetic water use efficiency (WUE) at leaf level of cucumber plants. The DROP treatment caused an increase of WUE in the leaves treated by DROP during their early growth (D1), but not in leaves which were already mature during the treatment (D2). The WUE increase in D1 compared to D2 leaves was due to higher net photosynthetic rate at low temperature or lower transpiration rate at common temperature. The elongation of the DROP treatment from early growth stage until full maturation of leaves did not lead to an additional increase in WUE compared to the leaves treated by DROP only during their early growth.
Responses of the photosynthetic apparatus in cucumber (Cucumis sativus L.) leaves were exam ined ... more Responses of the photosynthetic apparatus in cucumber (Cucumis sativus L.) leaves were exam ined after exposing the plants to daily short term temperature drops to 12°C (for 2 h at the end of night peri ods, DROP treatment) during active leaf growth (DROP I) and at the mature leaf stage (DROP II). The DROP treatment induced adaptive changes in the photosynthetic apparatus that were evident in elevated photosyn thetic activity at low temperature, modified composition of pigments, altered water content in leaves, and altered ratio of leaf dry matter to leaf area. The stage of leaf development had a significant influence on the responses of photosynthetic apparatus to DROP treatments. The leaves subjected to DROP during active growth were capable of large structural rearrangements, which provided a larger increase in resistance of pho tosynthesis to low temperature, whereas the leaves exposed to temperature drops at the mature leaf state were characterized by the reduced capacity for acclimation.
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Seasonal changes of the soil CO 2 concentration and the rate of CO 2 fluxes emission from the soi... more Seasonal changes of the soil CO 2 concentration and the rate of CO 2 fluxes emission from the soil formed on the sediments of the former Lake Texcoco, which occupied a significant part of the Mexico Valley until the mid-17th century, were studied. The soils (Fluvic Endogleyic Phaeozems) were characterized by a low CO 2 fluxes rate, which is related to their high alkalinity. The mean values of soil respiration were 6.0-14.1 mg C/(m 2 h) depending on vegetation type, which corresponds to 60-157 g C/(m 2 yr). The contribution of plants to the CO 2 fluxes insignificantly varied by seasons and depended on the species composition of vegetation. The soil CO 2 concentration and soil respiration in eucalypt (Eucalyptus globulus Labill.) plantation were two times higher than those in the grass-subshrub area, the ground cover of which consisted of Distichlis spicata (L.) Greene and Suaeda nigra (Raf.) J.F. Macbr. species. This can be related to the significant volumes of gas production during the respiration of eucalypt roots and associated rhizosphere community. The contribution of the root systems of grass cover to the soil CO 2 fluxes in eucalypt plantation slightly varied within the year and was equal to 24% on the average. In the grass-subshrub area, its value varied from 41% in the cold season to 60% in the warm season. The spatial variability of soil CO 2 concentration and its flux rate to the atmosphere was due to the differences in plant species composition and hydrothermal conditions, and their temporal trend was closely related to the seasonal accumulation of plant biomass and soil temperature.
На примере Allium cepa L. исследовали физиологическое состояние растений при произрастании их на ... more На примере Allium cepa L. исследовали физиологическое состояние растений при произрастании их на почвах, содержащих уникальную горную породу-шунгит. Показано, что количество шунгита в почве в большей степени, чем его дисперсность влияет на многие физиологические параметры растений. Как отклик на содержание шунгита в почве у растений может увеличиться доля корней в общей биомассе, количество листьев, ассимиляции углерода и эффективность использования света и воды на фотосинтез.
Пленарные доклады 1Казанский институт биохимии и биофизики-обособленное структурное подразделение... more Пленарные доклады 1Казанский институт биохимии и биофизики-обособленное структурное подразделение ФИЦ КазНЦ РАН, Казань, Россия 2Казанский (Приволжский) федеральный университет, Казань, Россия, 3Федеральное государственное бюджетное учреждение науки Институт биохимии и физиологии растений и микроорганизмов РАН, Саратов, Россия, 4Институт органической и физической химии им. А.Е. Арбузова-обособленное структурное подразделение ФИЦ КазНЦ РАН, Казань, Россия
Book of proceedings of the All-Russian Scientific Conference with International Participation and Schools of Young Scientists "Mechanisms of resistance of plants and microorganisms to unfavorable environmental" (parts I, II), Jul 1, 2018
The application of nutrient-rich substrates to soils characterized by low natural fertility is di... more The application of nutrient-rich substrates to soils characterized by low natural fertility is discussed as a strategy to improve soil fertility and, consequently, affect plant physiological traits. This study aimed to evaluate if sodium lignosulfonate (LS), a by-products of pulp and paper industry, may improve plant ecophysiological traits under contrasting nutrient conditions. A pot culture experiment was conducted with cucumber plants, using LS concentrations of 0, 1, 2.5, 5, and 10 vol.% in sandy soil, and two soil nutrient levels: sufficient and low nutrient availability (SNA and LNA, accordingly). The LS increased N and P content in SNA leaves when 1% of LS was used and decreased N content in LNA leaves regardless of soil LS content. The LS did reduce mass-, N-, and P-based respiration rates of the SNA leaves, and increased the N-based respiration rate under LNA. The LS did not have a significant impact on the ratio of respiration to photosynthesis in SNA leaves, but decreased it under LNA. The LS application contributed to a slight activation of some physiological processes in LNA plants, but it was not successful to recover these activities to the level of plants grown under SNA.
In greenhouse production a temperature drop concept has become an important tool to control stem ... more In greenhouse production a temperature drop concept has become an important tool to control stem elongation of a number of ornamental plant species, bedding plants and vegetable transplants. This concept takes advantage of the fact that, in many species, plant stem elongation is sensitive to a short diurnal temperature drop in the morning or in the end of the night. Here, the role of light in cucumber plant (Cucumis sativus L.) response to a diurnal temperature drop has been investigated. Plants were grown under relatively "low" (120 µmol m-2 s-1 PPFD) or "high" (320 µmol m-2 s-1 PPFD) light intensity. The effect of a 2 h temperature drop from 23° to 9°C, either in the end of the night (in darkness) or in the beginning of the day (in light) on plant growth, photosynthetic and respiratory activity was studied. Light-demanding and shade-tolerant cucumber hybrids were used in experiments. The results showed differential temperature regulation of plant morphology and photosynthetic activity in light and darkness. A temperature drop in the light led to more pronounced decrease in biometric and photosynthetic parameters of plants than a temperature drop in darkness. Light intensity during plant growth also modified plant response to a temperature drop. In particular, a temperature drop in the night led to a decrease in photosynthetic activity only in plants grown under "low" light. The respiration of the leaves, on the contrary, was intensified as a result of a temperature drop in plants grown under "high" light. Light-demanding and shade-tolerant hybrids had generally similar response to a temperature drop, but some differences were also revealed. Thus, the degree of light inhibition of mitochondrial respiration decreased due to a temperature drop only in the leaves of light-demanding hybrids. They also demonstrated greater reduction of photosynthetic pigment content in response to a temperature drop compared to shade-tolerant plants. This suggests that plant response to a diurnal short-term temperature drop depends to large extend on the timing of the drop treatment (in light or darkness) and light growing conditions. The degree of plant light demand may also be important.
This study investigates the effect of daily short-term (2 h) low temperature treatment (12 C) (D... more This study investigates the effect of daily short-term (2 h) low temperature treatment (12 C) (DROP) on photosynthetic water use efficiency (WUE) at leaf level of cucumber plants. The DROP treatment caused an increase of WUE in the leaves treated by DROP during their early growth (D1), but not in leaves which were already mature during the treatment (D2). The WUE increase in D1 compared to D2 leaves was due to higher net photosynthetic rate at low temperature or lower transpiration rate at common temperature. The elongation of the DROP treatment from early growth stage until full maturation of leaves did not lead to an additional increase in WUE compared to the leaves treated by DROP only during their early growth.
Responses of the photosynthetic apparatus in cucumber (Cucumis sativus L.) leaves were exam ined ... more Responses of the photosynthetic apparatus in cucumber (Cucumis sativus L.) leaves were exam ined after exposing the plants to daily short term temperature drops to 12°C (for 2 h at the end of night peri ods, DROP treatment) during active leaf growth (DROP I) and at the mature leaf stage (DROP II). The DROP treatment induced adaptive changes in the photosynthetic apparatus that were evident in elevated photosyn thetic activity at low temperature, modified composition of pigments, altered water content in leaves, and altered ratio of leaf dry matter to leaf area. The stage of leaf development had a significant influence on the responses of photosynthetic apparatus to DROP treatments. The leaves subjected to DROP during active growth were capable of large structural rearrangements, which provided a larger increase in resistance of pho tosynthesis to low temperature, whereas the leaves exposed to temperature drops at the mature leaf state were characterized by the reduced capacity for acclimation.
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Seasonal changes of the soil CO 2 concentration and the rate of CO 2 fluxes emission from the soi... more Seasonal changes of the soil CO 2 concentration and the rate of CO 2 fluxes emission from the soil formed on the sediments of the former Lake Texcoco, which occupied a significant part of the Mexico Valley until the mid-17th century, were studied. The soils (Fluvic Endogleyic Phaeozems) were characterized by a low CO 2 fluxes rate, which is related to their high alkalinity. The mean values of soil respiration were 6.0-14.1 mg C/(m 2 h) depending on vegetation type, which corresponds to 60-157 g C/(m 2 yr). The contribution of plants to the CO 2 fluxes insignificantly varied by seasons and depended on the species composition of vegetation. The soil CO 2 concentration and soil respiration in eucalypt (Eucalyptus globulus Labill.) plantation were two times higher than those in the grass-subshrub area, the ground cover of which consisted of Distichlis spicata (L.) Greene and Suaeda nigra (Raf.) J.F. Macbr. species. This can be related to the significant volumes of gas production during the respiration of eucalypt roots and associated rhizosphere community. The contribution of the root systems of grass cover to the soil CO 2 fluxes in eucalypt plantation slightly varied within the year and was equal to 24% on the average. In the grass-subshrub area, its value varied from 41% in the cold season to 60% in the warm season. The spatial variability of soil CO 2 concentration and its flux rate to the atmosphere was due to the differences in plant species composition and hydrothermal conditions, and their temporal trend was closely related to the seasonal accumulation of plant biomass and soil temperature.
На примере Allium cepa L. исследовали физиологическое состояние растений при произрастании их на ... more На примере Allium cepa L. исследовали физиологическое состояние растений при произрастании их на почвах, содержащих уникальную горную породу-шунгит. Показано, что количество шунгита в почве в большей степени, чем его дисперсность влияет на многие физиологические параметры растений. Как отклик на содержание шунгита в почве у растений может увеличиться доля корней в общей биомассе, количество листьев, ассимиляции углерода и эффективность использования света и воды на фотосинтез.
Пленарные доклады 1Казанский институт биохимии и биофизики-обособленное структурное подразделение... more Пленарные доклады 1Казанский институт биохимии и биофизики-обособленное структурное подразделение ФИЦ КазНЦ РАН, Казань, Россия 2Казанский (Приволжский) федеральный университет, Казань, Россия, 3Федеральное государственное бюджетное учреждение науки Институт биохимии и физиологии растений и микроорганизмов РАН, Саратов, Россия, 4Институт органической и физической химии им. А.Е. Арбузова-обособленное структурное подразделение ФИЦ КазНЦ РАН, Казань, Россия
Uploads
Papers by Elena Ikkonen