INFLUENCE DE LA LUMIERE ET DE LA TEMPERATURE SUR LA TENEUR EN ACIDE LINOLENIQUE ET LA RESISTANCE AU GEL DU BLE D’HIVER

1980 ◽  
Vol 60 (2) ◽  
pp. 349-355 ◽  
Author(s):  
C. WILLEMOT ◽  
L. PELLETIER
Keyword(s):  
Low Temperature ◽  
Winter Wheat ◽  
Linolenic Acid ◽  
Mode Of Action ◽  
Frost Resistance ◽  
Frost Hardiness ◽  
Frost Hardening ◽  
Long Time

The correlation between accumulation of linolenic acid in the crowns and roots of winter wheat and its frost hardening at low temperature is indirect. It results from their common requirement for light and low temperature. Light mainly produces energy and carbon reserves. The partial hardening obtained in darkness could be eliminated by preetiolation. The high levels of linolenic acid and frost resistance reached after hardening were maintained for a long time in darkness. The levels of linolenic acid and frost hardiness decreased faster at low temperature in hardened plants after treatment with BASF 13-338, a substituted pyridazinone, than in plants deprived of light. The mode of action of BASF 13-338 is apparently not limited to the inhibition of photosynthesis.

ON THE INHIBITION OF FROST HARDENING OF WINTER WHEAT BY BASF 13-338, A DERIVATIVE OF PYRIDAZINONE

1979 ◽  
Vol 59 (1) ◽  
pp. 249-251 ◽  
Author(s):  
C. WILLEMOT ◽  
H. J. HOPE ◽  
J. C. ST-PIERRE
Keyword(s):  
Triticum Aestivum ◽  
Low Temperature ◽  
Winter Wheat ◽  
Linolenic Acid ◽  
Triticum Aestivum L ◽  
Frost Hardening ◽  
Acid Accumulation ◽  
Simultaneous Inhibition

BASF 13-338, a derivative of pyridazinone, inhibits photosynthesis without affecting. respiration in winter wheat (Triticum aestivum L.) at low temperature. This inhibition could account for the previously reported inhibition of frost hardening. Therefore, simultaneous inhibition of linolenic acid accumulation and of frost hardening are probably not causally related.

scholarly journals Use of the delayed luminescence test for evaluation of changes in frost-resistance of winter wheat

2013 ◽  
Vol 38 (1) ◽  
pp. 5-10 ◽  
Author(s):  
Aleksander Brzóstowicz ◽  
Zdzisław Prokowski ◽  
Antoni Murkowski ◽  
Edward Grabikowski
Keyword(s):  
Winter Wheat ◽  
Frost Resistance ◽  
Winter Season ◽  
Wheat Cultivars ◽  
Delayed Luminescence ◽  
Luminescence Method ◽  
Frost Hardening ◽  
Conductometric Method ◽  
Winter Wheat Cultivars ◽  
Autumn And Winter

The influence of frost hardening conditions on the frost-resistance of three winter wheat cultivars ('Mironowska 808', 'Grana' and 'Maris Huntsman') was studied. Frost resistance was measured periodically during the autumn and winter season by the delayed luminescence method. Parallelly an electrical conductivity test was performed for comparison. It was found that the temperature which delayed luminescence reaches its maximum (t<sub>N</sub>) correlates with (t<sub>50</sub>) obtained by the conductometric method. The differences in response of particular cultivars to frost and hardening conditions are described.

scholarly journals Biochemical and Physicochemical Background of Mammalian Androgen Activity in Winter Wheat Exposed to Low Temperature

2017 ◽  
Vol 37 (1) ◽  
pp. 199-219 ◽  
Author(s):  
Anna Janeczko ◽  
Jolanta Biesaga-Kościelniak ◽  
Michał Dziurka ◽  
Maria Filek ◽  
Katarzyna Hura ◽  
...  
Keyword(s):  
Low Temperature ◽  
Winter Wheat ◽  
Lipid Membranes ◽  
Frost Resistance ◽  
Redox Homeostasis ◽  
Physiological Role ◽  
Cellular Level ◽  
Wheat Seedlings ◽  
Wheat Leaves ◽  
Induced Changes

Abstract Understanding of the physiological role of mammalian hormone—androstenedione (AN)—in plants is scant and the mechanisms of its action at a cellular level are practically unknown. The aim of this study was to investigate the physicochemical and biochemical background of AN activity in winter wheat exposed to low temperature. Cold periods are important in the lifecycle of this species as they induce frost resistance and further generative development. Wheat seedlings (control and AN-supplemented) were acclimated 2 weeks in cold and then exposed to frost (−12 °C). AN supplementation reduced frost damages by 30%. Moreover, AN also accelerated generative development of wheat. The AN-induced changes in redox homeostasis seemed to be important for processes of acclimation to low temperature and generative induction. AN influenced hormonal balance in wheat and stimulated accumulation among other gibberellins and cytokinins. For example, in aerial part of plants, the content of GA3 was increased by AN in 12 days of cold by about 30%, whereas the content of cis-zeatin was increased by 65%. AN was absorbed into plant membranes (Langmuir bath studies). The membrane absorption of AN increased the distance between lipid molecules and this may be an important step in the AN-induced enhancement of frost resistance. AN interaction with lipid membranes showed similarity to the interactions of some known regulators stimulating flowering in plants, and thus it may also underlie the acceleration of wheat development. Androstenedione was naturally present in wheat leaves (5–21 pg g−1 FW).

EFFECT OF DROUGHT ON FROST RESISTANCE AND FATTY ACID CONTENT OF YOUNG WINTER WHEAT PLANTS

1979 ◽  
Vol 59 (3) ◽  
pp. 639-643 ◽  
Author(s):  
C. WILLEMOT ◽  
L. PELLETIER
Keyword(s):  
Drought Stress ◽  
Winter Wheat ◽  
Frost Resistance ◽  
Fatty Acid Content ◽  
Triticum Aestivum L ◽  
Temperature Treatment ◽  
Frost Hardening ◽  
Low Temperature Treatment ◽  
Degree Of Unsaturation ◽  
Water Holding

Low soil moisture, both prior to and during freezing, increased frost resistance of 12-day-old winter wheat (Triticum aestivum L.) plants. While frost resistance increased, percentage of linolenic acid decreased in drought-stressed plants (10% of soil water-holding capacity) as compared with controls (40%). This occurred whether drought stress was applied before freezing at 1 °C or at 20 °C. A degree of frost hardening can be achieved in winter wheat by drought stress without low temperature treatment, and without an increase in degree of unsaturation of fatty acids.

Changes in lipids of cereal seedlings during vernalization

1968 ◽  
Vol 46 (9) ◽  
pp. 1093-1097 ◽  
Author(s):  
E. S. Redshaw ◽  
Saul Zalik
Keyword(s):  
Linoleic Acid ◽  
Low Temperature ◽  
Winter Wheat ◽  
Linolenic Acid ◽  
Spring Wheat ◽  
Vernalization Response ◽  
Direct Role ◽  
Wheat Varieties ◽  
Temperature Growth ◽  
Low Temperature Growth

Noticeable changes in lipids were observed during growth of Sangaste fall rye, Prolific spring rye, Kharkov winter wheat, and Red Bobs spring wheat, at vernalizing temperature, over a period of 6 weeks. There was, however, little difference between the trends exhibited by the four varieties, apart from the fact that the rye varieties apparently accumulated more linolenic acid than the wheat varieties whereas the reverse was true for linoleic acid. These results suggested that the lipids under study did not play a direct role in the vernalization response, and the changes observed were a result of low-temperature growth.

Effect of Low-Temperature Long-Time Thermal Processing of Beef-Cuts on the Survival of Foot-and-Mouth Disease Virus

1995 ◽  
Vol 58 (2) ◽  
pp. 165-169 ◽  
Author(s):  
MARCELO O. MASANA ◽  
NORBERTO A. FONDEVILA ◽  
MARIA M. GALLINGER ◽  
JORGE A. LASTA ◽  
H. RICARDO RODRIGUEZ ◽  
...  
Keyword(s):  
Low Temperature ◽  
Disease Virus ◽  
Foot And Mouth Disease ◽  
Mouth Disease ◽  
Semitendinosus Muscle ◽  
Overall Acceptability ◽  
Mouth Disease Virus ◽  
Foot And Mouth ◽  
Long Time ◽  
Commercial Process

We determined the virucidal effectiveness against foot-and-mouth disease virus of the low-temperature long-time cooking of virus-contaminated semitendinosus muscle (ST). Of the 11 time and temperature combinations examined, over a range of 63°C to 75°C for extended periods, the respective processing conditions of 71°C for 10.66 h and 75°C for 5.75 h were virucidal. Samples cooked under these temperature-time combinations were more tender (P&lt;0.01) and had better overall acceptability (P&lt;0.05) than beef cuts cooked by conventional commercial processes currently used in Argentina for meat to be exported. Product yields were increased from 60% for the commercial process to 67.8% or 68.6%, respectively, for the two virucidal thermal processes.

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