Low-temperature-induced cankers and burls in test conifers and hardwoods

1975 ◽  
Vol 53 (21) ◽  
pp. 2526-2535 ◽  
Author(s):  
Harry Zalasky
Keyword(s):  
Low Temperature ◽  
Picea Glauca ◽  
Growth Ring ◽  
The Body ◽  
Tilia Cordata ◽  
Abies Lasiocarpa ◽  
Ulmus Americana ◽  
Temperature Changes ◽  
Cytological Changes ◽  
Multiple Treatments

Frost cankers were induced by low-temperature treatments with freon in Pinus contoria var. latifolia, P. sylvestris, Malus sylvestris, Tilia cordata, Ulmus americana, and U. pumila. Temperatures of 0 to −30 °C were attained in the bark and 5 to −6.5 °C in the cambium. Frost burls and frost ribs were perpetuated by multiple treatments in P. contorta var. latifolia, P. sylvestris, M. sylvestris, T. cordata, Abies lasiocarpa, and Picea glauca. They were produced by modified cambium that gave rise to morphological chimeras characterized by resiniferous tissues or pitch pockets, spiral-grained and nodulated sapwood, and scabby bark. Dead bark, corky tissues, and solidified resin exfoliated from the periphery of the frost rib.The cambium was consistently killed at −6.5 °C, which was considered the lethal temperature. Changes in the surrounding freeze–thaw area of the bark often caused the 10-day-old cells of the restitution tissues to become multinucleate and the dividing nuclei to have c-mitotic end-to-end chromosomes and tripolar spindles.Burl growth ring of conifers and hardwoods develops a xylem ray underlay gradually succeeded by restitution xylem. The phloem ray overlay is unique because of its resiniferous corky tissues, which consist of inner layers of irregular parenchymatous cells and outer layers of distinctive sclereid-like cells with recurvate lobes. The rays of phloem and xylem also have resin cells and sclereid-like cells diffused throughout the body of the ray. Deformed cells show cytological changes in the cell wall, lumen, and pits. Vessels have changes in the number and position of pits and perforations. Differences and similarities between low-temperature and fungus-induced cells and tissues are noted.

Indicators of metabolism and biochemical status of blood in horses of Yakut breed in winter and spring seasons

2020 ◽  
pp. 52-65
Author(s):  
U. Khompodoeva ◽  
R. Ivanov
Keyword(s):  
Classical Method ◽  
Live Weight ◽  
Weather Conditions ◽  
The Body ◽  
Metabolic Energy ◽  
Temperature Changes ◽  
Experimental Animals ◽  
Spring Period ◽  
Biochemical Status ◽  
Adaptive Mechanisms

The results of researches on the peculiarities of metabolism in the body of horses of Yakut breed in the winter and spring periods under the environments of Central Yakutia have been presented in the article. Physiological experiments on the digestibility of the main nutrients of the feed have been carried out in the winter (February) and spring (April) periods under the environments of the physiological yard in the Yakutsk Scientific and Research Institute of Agriculture named after M. G. Safronov with using the classical method. Five mares and five geldings of Yakut breed have been selected for researches. The average live weight of mares was 378–410 kg, geldings 394–403 kg. The experimental animals had average fatness. It has been found a higher intake of energy and the main nutrients of hay as a mono feed in winter compared to the spring period. At the same time pregnant mares in winter have been consumed 103,8±3,12 MJ of metabolic energy per head/day, which was 27,3 % significantly higher than in the spring period – 75,4±2,18 MJ (P ≥ 0,999). Geldings have been consumed in the experiment 67,70±2,85 MJ, which was by 43,7 % higher than in the spring period – 38,05 ± 4,40 MJ of metabolic energy per head/day (P ≥ 0,999). Experimental animals have been housed in stalls; there was no energy expenditure for movement, so the amount of energy consumed in winter indicates the production of heat in the animal’s body. Pregnant mares per 100 kg of live weight have consumed 31,5±4,11 MJ of metabolic energy or 33,3 % more than in the spring period – 21,0±1,98 MJ; geldings have consumed 27,69±1,12, which was 41,78 % significantly higher than in the spring – 16,12 ± 0,75 MJ (P ≥ 0,999). The high intake of metabolic energy into the body of Yakut horses in winter is explained by the manifestation of adaptive mechanisms that affect the effective metabolism for survival, adapted to frequent changes in weather conditions and sharp temperature changes. The established differences in the biochemical parameters of blood serum of horses of Yakut breed are associated with changes in the consumption and digestibility of basic nutrients and energy, depending on the ambient temperature.

On the Regulation of the Respiration in Reptiles

1961 ◽  
Vol 38 (2) ◽  
pp. 301-314 ◽  
Author(s):  
BODIL NIELSEN
Keyword(s):  
Steady State ◽  
Body Temperature ◽  
Metabolic Rate ◽  
Temperature Interval ◽  
Normal Values ◽  
Pulmonary Ventilation ◽  
The Body ◽  
Respiratory Frequency ◽  
Temperature Changes ◽  
Instantaneous Increase

1. In two species of Lacerta (L. viridis and L. sicula) the effects on respiration of body temperature (changes in metabolic rate) and of CO2 added to the inspired air were studied. 2. Pulmonary ventilation increases when body temperature increases. The increase is brought about by an increase in respiratory frequency. No relationship is found between respiratory depth and temperature. 3. The rise in ventilation is provoked by the needs of metabolism and is not established for temperature regulating purposes (in the temperature interval 10°-35°C). 4. The ventilation per litre O2 consumed has a high numerical value (about 75, compared to about 20 in man). It varies with the body temperature and demonstrates that the inspired air is better utilized at the higher temperatures. 5. Pulmonary ventilation increases with increasing CO2 percentages in the inspired air between o and 3%. At further increases in the CO2 percentage (3-13.5%) it decreases again. 6. At each CO2 percentage the pulmonary ventilation reaches a steady state after some time (10-60 min.) and is then unchanged over prolonged periods (1 hr.). 7. The respiratory frequency in the steady state decreases with increasing CO2 percentages. The respiratory depth in the steady state increases with increasing CO2 percentages. This effect of CO2 breathing is not influenced by a change in body temperature from 20° to 30°C. 8. Respiration is periodically inhibited by CO2 percentages above 4%. This inhibition, causing a Cheyne-Stokes-like respiration, ceases after a certain time, proportional to the CO2 percentage (1 hr. at 8-13% CO2), and respiration becomes regular (steady state). Shift to room air breathing causes an instantaneous increase in frequency to well above the normal value followed by a gradual decrease to normal values. 9. The nature of the CO2 effect on respiratory frequency and respiratory depth is discussed, considering both chemoreceptor and humoral mechanisms.

TEMPERATURE REGULATION IN EXERCISE

PEDIATRICS ◽  
1963 ◽  
Vol 32 (4) ◽  
pp. 691-702
Author(s):  
Sid Robinson
Keyword(s):  
Blood Flow ◽  
Body Temperature ◽  
Heat Stroke ◽  
The Body ◽  
Physiological Regulation ◽  
Temperature Changes ◽  
Metabolic Heat ◽  
Warm Blood ◽  
Hot Environments ◽  
Large Increments

The central body temperature of a man rises gradually during the first half hour of a period of work to a higher level and this level is precisely maintained until the work is stopped; body temperature then slowly declines to the usual resting level. During prolonged work the temperature regulatory center in the hypothalamus appears to be reset at a level which is proportional to the intensity of the work and this setting is independent of environmental temperature changes ranging from cold to moderately warm. In hot environments the resistance to heat loss may be so great that all of the increased metabolic heat of work cannot be dissipated and the man's central temperature will rise above the thermostatic setting. If this condition of imbalance is continued long enough heat stroke will ensue. We have found that in a 3 mile race lasting only 14 minutes on a hot summer day a runner's rectal temperature may rise to 41.1°C., with heat stroke imminent. The physiological regulation of body temperature of men in warm environments and during the increased metabolic heat production of work is dependent on sweating to provide evaporative cooling of the skin, and on adjustments of cutaneous blood flow which determine the conductance of heat from the deeper tissues to the skin. The mechanisms of regulating these responses during work are complex and not entirely understood. Recent experiments carried out in this laboratory indicate that during work, sweating may be regulated by reflexes originating from thermal receptors in the veins draining warm blood from the muscles, summated with reflexes from the cutaneous thermal receptors, both acting through the hypothalamic center, the activity of which is increased in proportion to its own temperature. At the beginning of work the demand for blood flow to the muscles results in reflex vasoconstriction in the skin. As the body temperature rises the thermal demand predominates and the cutaneous vessels dilate, increasing heat conductance to the skin. Large increments in cardiac output and compensatory vasoconstriction in the abdominal viscera make these vascular adjustments in work possible without circulatory embarrassment.

scholarly journals Joint transcriptomic and metabolomic analysis reveals the mechanism of low-temperature tolerance in Hosta ventricosa

PLoS ONE ◽  
2021 ◽  
Vol 16 (11) ◽  
pp. e0259455
Author(s):  
QianQian Zhuang ◽  
Shaopeng Chen ◽  
ZhiXin Jua ◽  
Yue Yao
Keyword(s):  
Signal Transduction ◽  
Low Temperature ◽  
Temperature Tolerance ◽  
Differentially Expressed ◽  
Metabolomic Analysis ◽  
Temperature Changes ◽  
Low Temperature Tolerance ◽  
Content Ratio ◽  
Temperature Damage ◽  
Hosta Ventricosa

Hosta ventricosa is a robust ornamental perennial plant that can tolerate low temperatures, and which is widely used in urban landscaping design in Northeast China. However, the mechanism of cold-stress tolerance in this species is unclear. A combination of transcriptomic and metabolomic analysis was used to explore the mechanism of low-temperature tolerance in H. ventricosa. A total of 12 059 differentially expressed genes and 131 differentially expressed metabolites were obtained, which were mainly concentrated in the signal transduction and phenylpropanoid metabolic pathways. In the process of low-temperature signal transduction, possibly by transmitting Ca2+ inside and outside the cell through the ion channels on the three cell membranes of COLD, CNGCs and CRLK, H. ventricosa senses temperature changes and stimulates SCRM to combine with DREB through the MAPK signal pathway and Ca2+ signal sensors such as CBL, thus strengthening its low-temperature resistance. The pathways of phenylpropanoid and flavonoid metabolism represent the main mechanism of low-temperature tolerance in this species. The plant protects itself from low-temperature damage by increasing its content of genistein, scopolentin and scopolin. It is speculated that H. ventricosa can also adjust the content ratio of sinapyl alcohol and coniferyl alcohol and thereby alter the morphological structure of its cell walls and so increase its resistance to low temperatures.When subjected to low-temperature stress, H. ventricosa perceives temperature changes via COLD, CNGCs and CRLK, and protection from low-temperature damage is achieved by an increase in the levels of genistein, scopolentin and scopolin through the pathways of phenylpropanoid biosynthesis and flavonoid biosynthesis.

scholarly journals Using Picus® Sonic Tomograph to assess the health state of trees of monumental sizes

2017 ◽  
Vol 13 (2) ◽  
pp. 73-82
Author(s):  
Wojciech Durlak ◽  
Margot Dudkiewicz ◽  
Krystyna Pudelska ◽  
Marek Dąbski
Keyword(s):  
Cultural Landscape ◽  
Visual Assessment ◽  
Image Resolution ◽  
The Body ◽  
Actual State ◽  
Health State ◽  
Tilia Cordata ◽  
Sound Waves ◽  
Gingko Biloba ◽  
Ulmus Glabra

The aim of the study was to examine the usefulness of The Picus 3 Sonic Tomograph to assess the health state of trees of monumental sizes, which are an important part of the cultural landscape. In the study there were selected tree species Tilia cordata, Gingko biloba and Ulmus glabra growing in the vicinity of Lublin in different habitat conditions. Changes in the internal structure of the tree trunks were shown on the colour tomograms. Two tested specimens of Tilia cordata located in Radawiec Duży were intended to be cut down due to the construction of the ring road of Lublin. This made it possible to compare the obtained tomograms with the actual state of the inside of tree trunks after cutting down the examined trees. The results of Picus tomography Ulmus glabra and Gingko biloba growing in the historic park in Czesławice were confirmed by a visual assessment of trees. In each case the number of installed sensors influenced the image resolution and accuracy of the obtained tomograms. Diagnostics using sound waves is important in assessing the state of health of each tree, but it is especially recommended for testing of valuable trees. It allows for early diagnosis and selection of such protective actions to reduce to a minimum the destructive impact study on the body of the plant.

Extracellular and intracellular carbon dioxide concentration as a function of temperature in the toad Bufo marinus.

1994 ◽  
Vol 195 (1) ◽  
pp. 345-360 ◽  
Author(s):  
J N Stinner ◽  
D L Newlon ◽  
N Heisler
Keyword(s):  
Body Temperature ◽  
Extracellular Fluid ◽  
Carbon Dioxide Concentration ◽  
The Body ◽  
Whole Body ◽  
Mean Values ◽  
Temperature Changes ◽  
Fluid Compartment ◽  
Average Change ◽  
Higher Temperature

Previous studies of reptiles and amphibians have shown that changing the body temperature consistently produces transient changes in the respiratory exchange ratio (RE) and, hence, changes in whole-body CO2 stores, and that the extracellular fluid compartment contributes to the temperature-related changes in CO2 stores. The purpose of this study was to determine whether the intracellular fluid compartment contributes to the changes in CO2 stores in undisturbed resting cane toads. Increasing body temperature from 10 to 30 degrees C temporarily elevated RE, and returning body temperature to 10 degrees C temporarily lowered RE. The estimated average change in whole-body CO2 stores associated with the transient changes in RE was 1.0 +/- 0.8 mmol kg-1 (+/- S.D., N = 6). Plasma [CO2] and, thus, extracellular fluid [CO2], were unaffected by the temperature change. Plasma calcium levels were also unaffected, so that bone CO2 stores did not contribute to changes in whole-body CO2 stores. Intracellular [CO2] was determined for the lung, oesophagus, stomach, small intestine, liver, ventricle, red blood cells, skin and 14 skeletal muscles. [CO2] was significantly lower (P < 0.05) at higher temperature in 10 of these, and seven others, although not statistically significant (P > 0.05), had mean values at least 0.5 mmol kg-1 lower at the higher temperature. The average change in intracellular [CO2] for all tissues examined was -0.165 mmol kg-1 degrees C-1. We conclude that, in cane toads, the temperature-related transients in RE result from intracellular CO2 adjustments, that different tissues have unique intracellular CO2/temperature relationships, and that a combination of respiratory and ion-exchange mechanisms is used to adjust pH as temperature changes.

The influence of the low temperature of the Far North on the body temperature of pigs in the experiment

2019 ◽  
pp. 110-112
Author(s):  
M.I. Tomsky ◽  
R.Z. Alexeev ◽  
N.A. Struchkov ◽  
K.R. Nifontov ◽  
V.S. Fomina ◽  
...  
Keyword(s):  
Body Temperature ◽  
Low Temperature ◽  
The Body ◽  
Far North

The Activity of Slugs

1954 ◽  
Vol 31 (2) ◽  
pp. 165-187
Author(s):  
BARBARA H. DAINTON
Keyword(s):  
Water Content ◽  
Diurnal Rhythm ◽  
High Water ◽  
The Body ◽  
High Water Content ◽  
Atmospheric Moisture ◽  
Ecological Significance ◽  
Preferred Temperature ◽  
Temperature Changes ◽  
A Minor

1. The effect of moisture and temperature on the activity of slugs has been investigated in the laboratory and in the field. 2. Atmospheric moisture has no direct effect on activity, though it may limit the duration of activity by influencing the water content of the body. Animals of high water content are not inherently active but they respond more readily to other stimuli than animals of low water content. 3. Between 4 and 20° C. activity is induced by falling temperatures and suppressed by rising temperatures. Temperature changes as slight as 0.1° C. per hour are perceived. 4. The daily rhythm of activity and rest thus follows the normal diurnal rhythm of falling temperature by night and rising temperature by day, except when daytime mists and showers superimpose a minor fluctuation and result in daytime activity. No activity is observed on continuously wet days which are normally without such fluctuations. 5. Between 20 and 30° C. activity is induced by rising temperatures and suppressed by falling temperatures. The ecological significance of this is discussed. 6. When maintained at constant temperature slugs show a persistent but immediately and steadily deteriorating diurnal rhythm of activity and rest which could not of itself account for the regular appearance of nocturnal activity in the field. 7. In a temperature gradient slugs aggregate about a preferred temperature. The ecological significance of this is discussed. 8. The difficulty of describing these reactions in the terminology put forward by Fraenkel & Gunn (1940) is considered.

Cardiovascular and sweating responses to water ingestion during dehydration

1965 ◽  
Vol 20 (5) ◽  
pp. 975-979 ◽  
Author(s):  
Leo C. Senay ◽  
Margaret L. Christensen
Keyword(s):  
Blood Flow ◽  
The Body ◽  
Evaporative Heat Loss ◽  
Cutaneous Blood Flow ◽  
Temperature Changes ◽  
Fluid Ingestion ◽  
Water Ingestion ◽  
Heat Chamber ◽  
Saline Ingestion ◽  
Cutaneous Blood

The experiments reported are concerned with cardiovascular and sudomotor events preceding, accompanying, and following ingestion of water by five dehydrating subjects 8.75 hr after entrance into a heat chamber (43.3 C DB, 29 C WB). Certain skin areas such as the cheek showed increases in evaporative heat loss before subjects came in contact with water. This reflex could be initiated by saline ingestion but the degree of skin and oral temperature changes appeared to depend on tonicity of fluid ingested. The gustatory reflex was not thought to be the initiating agent for sudomotor responses. Increases in cutaneous blood flow appeared to begin almost as promptly as sweating responses but took considerably longer to develop. Ingestion of saline, though initiating a sweating response, did not alter heart rate, blood pressure, or cutaneous blood flow. It is suggested that fluid ingestion, regardless of tonicity, triggers reflex sweating over the body surface. Intensity and duration of this sudomotor response, as well as initiation of cardiovascular changes, apparently depend on tonicity of ingested fluid. cutaneous blood flow; skin temperature; regional sweating Submitted on November 27, 1964

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