The relationship between plant sugar concentration, osmotic potential, and frost tolerance in Kharkov MC22 winter wheat. Sugar and frost tolerance

1972 ◽  
Vol 50 (3) ◽  
pp. 677-680 ◽  
Author(s):  
D. G. Green
Keyword(s):  
Winter Wheat ◽  
Osmotic Potential ◽  
Reducing Sugars ◽  
Water Status ◽  
Frost Tolerance ◽  
Leaf Water Content ◽  
Total Carbohydrate ◽  
Wheat Seedlings ◽  
The Relationship ◽  
Individual Importance

Increased frost survival after exposure of winter wheat seedlings to solutions of glucose, sucrose, or mannitol was not explained simply by changes in the osmotic potential of the leaves. In some cases either an increase in percentage total carbohydrate and reducing sugars, or a slight decrease in leaf water content increased frost survival. Because of the dependency of osmotic potential and percentage total carbohydrate and reducing sugars on the plant's water status, it is difficult to evaluate their individual importance to frost survival. Because maleic hydroxide is residual it does not have application as a short-term (1-week) growth retardant for increasing frost tolerance in winter wheat.

Effects of the Russian wheat aphid on osmotic potential and fructan content of winter wheat seedlings

Euphytica ◽  
1993 ◽  
Vol 65 (1) ◽  
pp. 9-14 ◽  
Author(s):  
E.W. Storlie ◽  
L.E. Talbert ◽  
G.A. Taylor ◽  
H.A. Ferguson ◽  
J.H. Brown
Keyword(s):  
Winter Wheat ◽  
Osmotic Potential ◽  
Russian Wheat Aphid ◽  
Wheat Seedlings

scholarly journals Remotely Sensed Water Limitation in Vegetation: Insights from an Experiment with Unmanned Aerial Vehicles (UAVs)

2019 ◽  
Vol 11 (16) ◽  
pp. 1853 ◽  
Author(s):  
Kelly Easterday ◽  
Chippie Kislik ◽  
Todd Dawson ◽  
Sean Hogan ◽  
Maggi Kelly
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Water Content ◽  
Water Deficit ◽  
Water Status ◽  
Field Measurements ◽  
Leaf Water Content ◽  
Multispectral Imagery ◽  
Spectral Indices ◽  
Aerial Vehicles ◽  
The Relationship

Unmanned aerial vehicles (UAVs) equipped with multispectral sensors present an opportunity to monitor vegetation with on-demand high spatial and temporal resolution. In this study we use multispectral imagery from quadcopter UAVs to monitor the progression of a water manipulation experiment on a common shrub, Baccharis pilularis (coyote brush) at the Blue Oak Ranch Reserve (BORR) ~20 km east of San Jose, California. We recorded multispectral imagery at several altitudes with nearly hourly intervals to explore the relationship between two common spectral indices, NDVI (normalized difference vegetation index) and NDRE (normalized difference red edge index), leaf water content and water potential as physiological metrics of plant water status, across a gradient of water deficit. An examination of the spatial and temporal thresholds at which water limitations were most detectable revealed that the best separation between levels of water deficit were at higher resolution (lower flying height), and in the morning (NDVI) and early morning (NDRE). We found that both measures were able to identify moisture deficit across treatments; however, NDVI was better able to distinguish between treatments than NDRE and was more positively correlated with field measurements of leaf water content. Finally, we explored how relationships between spectral indices and water status changed when the imagery was scaled to courser resolutions provided by satellite-based imagery (PlanetScope).We found that PlanetScope data was able to capture the overall trend in treatments but unable to capture subtle changes in water content. These kinds of experiments that evaluate the relationship between direct field measurements and UAV camera sensitivity are needed to enable translation of field-based physiology measurements to landscape or regional scales.

The relationship between frost tolerance and generative induction in winter wheat (Triticum aestivum L.) under field conditions

2009 ◽  
Vol 89 (6) ◽  
pp. 1031-1039 ◽  
Author(s):  
A K Bergjord ◽  
A K Bakken ◽  
A O Skjelvåg
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Triticum Aestivum L ◽  
Frost Tolerance ◽  
Short Day ◽  
Stage Of Development ◽  
Long Day ◽  
Subsequent Decrease ◽  
The Relationship ◽  
Quantitative Nature

The quantitative nature of the vernalization and photoperiod requirements and the interference of plant age with these mechanisms complicate predictions of generative induction and its relation to frost tolerance. This study was designed to dissect further the course of development towards full generative induction and to time the stages in frost tolerance. Two cultivars of winter wheat were regularly sampled from fields at four sites during three winters. The apex stage of development was observed at time of sampling and after 3 subsequent weeks of growth at 18°C, under either short or long days. Level of frost tolerance at sampling was also recorded. No visible change in apex appearance was found at time of sampling, but readiness of plants to initiate generative development was enhanced. Vernalization by low temperatures alone was not enough to induce the plants into generative development or initiate loss of frost tolerance. Short day conditions after sampling delayed the appearance of double ridges by 6-9 wk as compared with long day conditions. The timing of maximum frost tolerance and its subsequent decrease indicated that generative induction under the short day conditions prevailing in field occurred about 1 mo after vernalization saturation.Key words: Triticum aestivum L., frost tolerance, generative induction, vernalization, photoperiod

Water relations in Azospirillum-inoculated wheat seedlings under osmotic stress

1998 ◽  
Vol 76 (2) ◽  
pp. 238-244 ◽  
Author(s):  
Cecilia M Creus ◽  
Rolando J Sueldo ◽  
Carlos A Barassi
Keyword(s):  
Cell Wall ◽  
Osmotic Stress ◽  
Water Relations ◽  
Osmotic Potential ◽  
Modulus Of Elasticity ◽  
Growth Promotion ◽  
Water Status ◽  
Water Volume ◽  
Wheat Seedlings ◽  
Water Fraction

Azospirillum has been shown to improve coleoptile growth in seedlings growing in darkness under osmotic stress. However, the changes in water relations that may occur in this experimental system have not yet been studied. Two-centimetre long Triticum aestivum cv. Buck Pucará and Triticum durum cv. Balcarceño-INTA seedlings were inoculated with viable or autoclaved (control) Azospirillum brasilense Sp. 245 bacteria, at approximately 108 cells per seedling. Three days after inoculation, seedlings were exposed to osmotic stress by immersing their roots in 20% polyethylene glycol 6000 for up to 72 h. Germination and seedling growth were at 20°C in darkness. Shoots were excised after 72 h of stress, and water-status parameters were determined through pressure-volume analyses. While osmotic potential at full turgor remained constant, Azospirillum-stimulated growth in Buck Pucará seedlings was accompanied by significant decreases in osmotic potential and relative water content at zero turgor, in volumetric cell wall modulus of elasticity, and in absolute symplastic water volume and by a significant rise in apoplastic water fraction parameters. Except for a constant volumetric cell wall modulus of elasticity, similar results were obtained with Balcarceño-INTA seedlings. However, bacterial growth promotion was evident only in the less tolerant cv. Buck Pucará. Turgor at low water potential was higher in inoculated seedlings in both wheat cultivars under osmotic stress. These results are consistent with a better water status in Azospirillum-inoculated wheat seedlings under water stress, where both effects on cell wall elasticity and (or) apoplastic water are evident.Key words: Azospirillum, drought, seedlings, water status, wheat.

Lectin activity of winter wheat seedlings affected by eyespot causal agent under the action of Bacillus subtilis 537/Б1 bacterial isolates

2018 ◽  
Vol 96 (10) ◽  
pp. 27-34
Author(s):  
M. Musiienko ◽  
L. Batsmanova ◽  
Ju. Pys'menna ◽  
T. Kondratiuk ◽  
N. Taran ◽  
...  
Keyword(s):  
Bacillus Subtilis ◽  
Winter Wheat ◽  
Causal Agent ◽  
Bacterial Isolates ◽  
Lectin Activity ◽  
Wheat Seedlings

Osmotic Potential of Winter Wheat Crowns for Comparing Cultivars Varying in Winterhardiness

1989 ◽  
Vol 81 (2) ◽  
pp. 159-163 ◽  
Author(s):  
J. T. DeNoma ◽  
G. A. Taylor ◽  
H. Ferguson
Keyword(s):  
Winter Wheat ◽  
Osmotic Potential
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