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.

scholarly journals Yield component variation in winter wheat grown under drought stress

2000 ◽  
Vol 80 (4) ◽  
pp. 739-745 ◽  
Author(s):  
B. L. Duggan ◽  
D. R. Domitruk ◽  
D. B. Fowler
Keyword(s):  
Drought Stress ◽  
Winter Wheat ◽  
Grain Yield ◽  
Triticum Aestivum L ◽  
Yield Component ◽  
Yield Potential ◽  
High Yield ◽  
Crop Water ◽  
Kernel Number ◽  
High Yield Potential

Crops produced in the semiarid environment of western Canada are subjected to variable and unpredictable periods of drought stress. The objective of this study was to determine the inter-relationships among yield components and grain yield of winter wheat (Triticum aestivum L) so that guidelines could be established for the production of cultivars with high yield potential and stability. Five hard red winter wheat genotypes were grown in 15 field trials conducted throughout Saskatchewan from 1989–1991. Although this study included genotypes with widely different yield potential and yield component arrangements, only small differences in grain yield occurred within trials under dryland conditions. High kernel number, through greater tillering, was shown to be an adaptation to low-stress conditions. The ability of winter wheat to produce large numbers of tillers was evident in the spring in all trials; however, this early season potential was not maintained due to extensive tiller die-back. Tiller die-back often meant that high yield potential genotypes became sink limiting with reduced ability to respond to subsequent improvements in growing season weather conditions. As tiller number increased under more favourable crop water conditions genetic limits in kernels spike−1 became more identified with yield potential. It is likely then, that tillering capacity per se is less important in winter wheat than the development of vigorous tillers with numerous large kernels spike−1. For example, the highest yielding genotype under dryland conditions was a breeding line, S86-808, which was able to maintain a greater sink capacity as a result of a higher number of larger kernels spike−1. It appears that without yield component compensation, a cultivar can be unresponsive to improved crop water conditions (stable) or it can have a high mean yield, but it cannot possess both characteristics. Key words: Triticum aestivum L., wheat, drought stress, kernel weight, kernel number, spike density, grain yield

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 Considering the method of frost resistance determination for Winter Wheat (Triticum aestivum L.) varieties

2008 ◽  
Vol 0 (2(8)) ◽  
pp. 30-33
Author(s):  
Н. І. Рябчун ◽  
В. П. Петренкова ◽  
С. О. Ткачик ◽  
А. В. Андрющенко
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Frost Resistance ◽  
Triticum Aestivum L

Experiments on vernalisation

1936 ◽  
Vol 26 (1) ◽  
pp. 155-171 ◽  
Author(s):  
G. D. H. Bell
Keyword(s):  
Low Temperature ◽  
Winter Wheat ◽  
Early Growth ◽  
Temperature Treatment ◽  
Developmental Studies ◽  
Wheat Varieties ◽  
Low Temperature Treatment ◽  
Winter Wheat Varieties

1. The effect of low-temperature treatment on some varieties of wheat, barley and oats has been found to be profoundly affected by the time of sowing of the treated grain.2. Winter sowing showed the least vernalisation effect, while in the spring the stimulative action became more pronounced as far as earing acceleration is concerned, as the sowing was made progressively later. This was particularly marked in winter varieties.3. Developmental studies of the control and vernalised plants showed the stimulative action on early growth and growing point development in the winter varieties.4. Tiller counts on control and vernalised plants of three winter wheat varieties demonstrated the fact that each variety was stimulated to earlier tiller production, but in two of the varieties this resulted in a reduction of surviving ears at harvest.

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.

Response of Dehydrins to Drought, Low Temperature, and ABA Treatment in Whole Plants and Cell Suspension Cultures of Blueberry

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 517c-517
Author(s):  
G.R. Panta ◽  
C.M. Parmentier ◽  
L.J. Rowland
Keyword(s):  
Drought Stress ◽  
Low Temperature ◽  
Cell Suspension ◽  
Cdna Clone ◽  
Cold Hardiness ◽  
Cell Suspension Cultures ◽  
Temperature Treatment ◽  
Suspension Cultures ◽  
Low Temperature Treatment ◽  
Whole Plants

Previously, three dehydrins of 65, 60, and 14 kDa were identified as the predominant proteins present in cold-acclimated blueberry floral buds. Levels were shown to increase with cold acclimation and decrease with deacclimation and resumption of growth. Recently, a dehydrin cDNA clone was isolated and sequenced, and shown to hybridize to messages likely to encode all three dehydrins. In the present study, expression of dehydrins was examined in blueberry cultivars in response to drought and low-temperature treatment and in cell suspension cultures in response to low temperature and ABA treatment. During 32 days of drought stress, relative shoot water content dropped to 51% to 90%, depending upon cultivars. For cold stress experiments, cultivars with different chilling requirements and levels of cold hardiness were kept at 4 °C for 5 weeks. Cell suspension cultures were held at 4 °C for up to 2 weeks. For ABA experiment, ABA concentrations ranging from 10-3 to 10-7 M were used. Dehydrins were monitored in response to various treatments at RNA and proteins levels using the cDNA clone and antisera raised against the dehydrins. Interestingly, a previously uncharacterized 30 kDa dehydrin was found to be the major low temperature and ABA-responsive protein in cell suspension cultures.

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