scholarly journals Features of gas exchange and use of reserve substances in pumpkin seedlings in conditions of skoto- and photomorphogenesis under the influence of gibberellin and chlormequat-chloride

2017 ◽  
Vol 8 (1) ◽  
pp. 71-76 ◽  
Author(s):  
I. V. Poprotska ◽  
V. G. Kuryata
Keyword(s):  
Carbon Dioxide ◽  
Gas Exchange ◽  
Growth Inhibition ◽  
Chlormequat Chloride ◽  
Protein Nitrogen ◽  
Carbon Dioxide Gas ◽  
Growth Increase ◽  
Carbon Dioxide Gas Exchange ◽  
Gibberellin Treatment ◽  
Nitrogen Containing Compounds

We investigated the effect of gibberellin and the antigibberellic agent chlormequat-chloride on gas exchange and use of reserve substances in pumpkin seedlings during germination in the light and in the dark. We established that an artificial strengthening or growth inhibition of pumpkin seedlings in conditions of skotomorphogenesis caused an increase in of respiration intensity. Gibberellin treatment increased the proportion of assimilation processes in carbon dioxide gas exchange of seedlings, and growth inhibition by retardant caused an increase in respiratory costs when the nutrition type switches in the light from heterotrophic to autotrophic. The formation by seedlings of the demand for reserve assimilates from cotyledons was largely determined by change of activity of subapical meristems, which is manifested in the acceleration of seed germination, enhancing of histogenesis for the actions of gibberellin and in the weakening of these processes under the influence of retardants. Reserve substances used both oil and nitrogen-containing compounds. The content of protein nitrogen in pumpkin cotyledons decreased more in the light than in the dark, moreover growth inhibition by the retardant slowed down and growth increase by gibberellin accelerated this process both in conditions of photomorphogenesis and skotomorphogenesis. 

scholarly journals Influence of gibberellin inhibitors on the accumulation and redistribution of various forms of carbohydrates and nitrogen-containing compounds in plants of Solanum melongena L.

Biologija ◽  
2020 ◽  
Vol 66 (1) ◽  
Author(s):  
Viktor Rogach ◽  
Kateryna Reshetnyk ◽  
Volodymyr Kuryata ◽  
Tatyana Rogach
Keyword(s):  
Nitrogen Content ◽  
Total Nitrogen ◽  
Chlorophyll Concentration ◽  
Solanum Melongena ◽  
Chlormequat Chloride ◽  
Protein Nitrogen ◽  
Vegetative Organs ◽  
Donor Acceptor ◽  
Number Of Leaves ◽  
Nitrogen Containing Compounds

The 0.025% tebuconazole (EW-250), 0.25% chlormequat chloride (CCC-750), and 0.15% ethephon (2-CEPA) influences growth processes, the leaf apparatus, chlorophyll concentration and various carbohydrates forms, and total nitrogen content in Solanum melongena L. The decrease in the linear dimensions of the aubergine was established for all preparations. The most significant decrease in height was observed after the application of 2-HEPCs. The retardants increased the number of leaves, the dry matter mass of leaves, the leaf area, chlorophyll content, and the surface density of the leaf. EW-250 and ССС-750 retardants strengthened carbohydrate accumulation in aubergine fruits, mainly due to reducing forms. During the growing season, the total and protein nitrogen content decreased in roots and stems both in control and in experiment variants. EW-250 and CCC-750 accelerated total and protein nitrogen outflow from roots and stems and increased its content in leaves. Increasing the carbohydrates content in fruits the retardants simultaneously reduced the content of various nitrogen forms. Such changes in the dynamics of total nitrogen under the influence of tebuconazole led to enhanced fruit formation on each plant. Thus, retardants EW-250 and ССС-750 changed the nature of the donor-acceptor relations in them by increasing the outflow of plastic substances from vegetative organs to fruits and increasing the culture productivity.

scholarly journals Effect of gibberellin and retardants on the germination of seeds with different types of reserve substances under the conditions of skoto- and photomorphogenesis

Biologija ◽  
2020 ◽  
Vol 65 (4) ◽  
Author(s):  
Iryna Poprotska ◽  
Volodymyr Kuryata ◽  
Оlena Khodanitska ◽  
Stepan Polyvanyi ◽  
Lyudmyla Golunova ◽  
...  
Keyword(s):  
Growth Rates ◽  
Opposite Effect ◽  
Growth Characteristics ◽  
Pumpkin Seed ◽  
Chlormequat Chloride ◽  
Protein Nitrogen ◽  
Plant Seeds ◽  
Different Types ◽  
Nitrogen Containing Compounds ◽  
Stimulation Of

The influence of preparations of phytohormone gibberellin and antigibberellin–retardants tebuconazole and chlormequat chloride – on the germination of plant seeds with different types of reserve compounds in the light (photomorphogenesis) and in the dark (skotomorphogenesis) was studied. It was established that under the action of gibberellin, stimulation of the aboveground part and root system growth of maize, beans and pumpkin seedlings was more intensive in comparison with the control. This process was faster in the dark. The use of tebuconazole and chlormequat chloride significantly inhibited the process of germination both in the light and in the dark. At the same time, the coefficient of the use of reserve substances was maximal under the action of gibberellin, and minimum under the action of retardants, both under the conditions of skoto- and photomorphogenesis. The change in the growth characteristics and the coefficient of the use of reserve substances of bean seeds was accompanied by a decrease in the content of total nitrogen, indicating the use of reserve nitrogen-containing compounds in the processes of morphogenesis. The content of protein nitrogen in the control was lower under the conditions of skotomorphogenesis than in the photomorphic seedlings, and the opposite effect was noted for the actions of gibberellin and the retardant. In the later stages of germination, the largest reserve oil of pumpkin seed remained in cotyledonary leaves of photomorphic plants under the effects of chlormequat chloride, which clearly correlated with the least intense growth rates of seedlings in this variant, both in the light and darkness. Under conditions of skotomorphogenesis the growth stimulating effect of gibberellin significantly increased, and the light blocked the action of this phytohormone.

Liquid Ventilation: It’s Not Science Fiction Anymore

1994 ◽  
Vol 5 (3) ◽  
pp. 246-254
Author(s):  
M. K. Gaedeke Norris ◽  
Bradley P. Fuhrman ◽  
Corinne Lowe Leach
Keyword(s):  
Gas Exchange ◽  
Science Fiction ◽  
Critical Care Nurses ◽  
Great Promise ◽  
Liquid Ventilation ◽  
Associated Gas ◽  
Carbon Dioxide Gas ◽  
Pulmonary Pathology ◽  
High Concentrations ◽  
Carbon Dioxide Gas Exchange

Liquid ventilation is, by all initial considerations, an unconventional concept. Decades of research, however, have found that by using perfluorocarbons, which are capable of holding high concentrations of critical gases such as oxygen and carbon dioxide, gas exchange optimal enough to support life is possible with no known toxic effects. The earliest method of liquid ventilation, tidal liquid breathing, involved infusion and active removal of tidal volumes of perfluorocarbons by a liquid ventilator for gas exchange. Recently, a new method of partial liquid breathing, called perfluorocarbon-associated gas exchange, makes the process of liquid ventilation simpler by using conventional gas ventilators. Current research is showing great promise in the use of liquid ventilation for patients with pulmonary pathology. Critical care nurses should become knowledgeable of this new mode of ventilation and be prepared to meet the special needs of this unique population

scholarly journals Assessment of acclimation of Pinus sibirica mountain ecotypes ex situ on CO2 -gas exchange parameters

2021 ◽  
Vol 20 (1) ◽  
pp. 66-69
Author(s):  
O. G. Bender
Keyword(s):  
Gas Exchange ◽  
Ex Situ ◽  
Pinus Sibirica ◽  
Gas Exchange Parameters ◽  
Siberian Stone Pine ◽  
Co2 Gas ◽  
Carbon Dioxide Gas ◽  
Hereditary Factors ◽  
Pinus Sibirica Du Tour ◽  
Carbon Dioxide Gas Exchange

Carbon dioxide gas exchange of vegetative scion Siberian stone pine ecotypes (Pinus sibirica Du Tour)from the West Sayan mountains altitudinal transect grown on the geographical grafting plantation in the south of theTomsk Region were studied. The altitudinal transect was represented by two ecotypes: low mountain zone and alpine zone.The age of the grafted trees was 20 years. It was shown that the photosynthesis intensity did not differ between ecotypessignificantly, and respiratory activity increased significantly along altitudinal transect and the differences were 40 %between ecotypes. The results of the experiment revealed that the respiration / photosynthesis ratio was 1.5 times higher inalpine ecotype than in low mountain ecotype, which indicates a lower plant productivity of the alpine ecotype. The resultsof measuring stomatal and mesophyll conductance showed that these values differ between ecotypes significantly. Alpineecotype was characterized with more high values of stomatal conductance, but low values of mesophyll conductancerelatively low-mountain ecotype. Alpine ecotype had more high values of CO2 in chloroplasts and electronic transportrates. The obtained data indicate the photosynthetic acclimation when ecotypes were moved to the warmer climate. Therespiratory activity are largely regulated by hereditary factors.

Enhancement of desorption amount of carbon dioxide gas from monoethanolamine solution using ultrasound and calcium chloride

2020 ◽  
Vol 59 (SK) ◽  
pp. SKKD08
Author(s):  
Yuya Kitamura ◽  
Hirokazu Okawa ◽  
Takahiro Kato ◽  
Katsuyasu Sugawara
Keyword(s):  
Carbon Dioxide ◽  
Calcium Chloride ◽  
Carbon Dioxide Gas
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