Low-Temperature-Induced GA3 Sensitivity of Wheat. III. Comparison of Low Temperature Effects on α-Amylase Production by Aleurone Tissue of Dwarf and Tall Wheat

1985 ◽  
Vol 12 (3) ◽  
pp. 269 ◽  
Author(s):  
SP Singh ◽  
LG Paleg
Keyword(s):  
Low Temperature ◽  
Gibberellic Acid ◽  
Temperature Effects ◽  
Temperature Response ◽  
Lag Time ◽  
Receptor Sites ◽  
Amylase Production ◽  
Aleurone Tissue ◽  
Temperature Exposure ◽  
Low Temperature Exposure

The low temperature effect on the gibberellic acid (GA3) sensitivity (measured as a-amylase production) of aleurone tissue or deembryonated seed of dwarf and tall wheat (F6 Rht 3/rht 3 isogenic lines) was studied. The results indicated that the low-temperature-induced increase in GA3 response is: quantitative and temporal; GA3 concentration-dependent; without effect on the lag-time of a-amylase production, and operative in the aleurone tissue of dwarf (Rht 3-containing) wheat. All these characteristics of the low temperature response of the Rht 3-containing aleurone tissue are similar to those reported earlier for Rht 1-containing and Rht 2-containing aleurone tissue. The present results support the hypothesis that low temperature exposure is able to cure or reverse the genetic lesions manifest in the aleurone tissue containing the Rht allele and that this may be mediated via an increase in GA3 receptor sites.

Low Temperature-Induced GA3 Sensitivity of Wheat. IV. Comparison of Low Temperature Effects on the Phospholipids of Aleurone Tissue of Dwarf and Tall Wheat

1985 ◽  
Vol 12 (3) ◽  
pp. 277 ◽  
Author(s):  
SP Singh ◽  
LG Paleg
Keyword(s):  
Fatty Acid ◽  
Low Temperature ◽  
Gibberellic Acid ◽  
Temperature Effects ◽  
Temporal Relationship ◽  
Phospholipid Metabolism ◽  
Isogenic Lines ◽  
Receptor Sites ◽  
Aleurone Tissue ◽  
Close Temporal Relationship

Low temperature effects on the phospholipids of F6 Rht 3/rht 3 isogenic lines of wheat were studied. Significant low-temperature-induced (5°C) augmentation in the phospholipids of the dwarf selection were detected. More specifically, a 20 h-5°C preincubation enhanced considerably the levels of phosphatidylinositol, phosphatidylcholine and phosphatidylethanolamine in the aleurone tissue of the dwarf selection. In addition, these changes displayed a very close temporal relationship with the low- temperature-induced increase in gibberellic acid (GA3) sensitivity. In the case of the tall selection, only the imbibition of water was required to initiate the synthesis of major phospholipids of its aleurone tissue and low temperature preincubation had no effect on either the phospholipids or their fatty acid constituents. These results are discussed in the light of the hypotheses that GA3 receptor sites are membrane-based lipids and that the Rht gene causes an aberration in the phospholipid metabolism of the aleurone tissue which can be corrected by low temperature.

Low-Temperature-Induced GA3 Sensitivity of Wheat. VI. Effect of Inhibitors of Lipid Biosynthesis on α-Amylase Production by Dwarf (Rht3) and Tall (Rht) Wheat, and on Lipid Metabolism of Tall Wheat Aleurone Tissue

1986 ◽  
Vol 13 (3) ◽  
pp. 409 ◽  
Author(s):  
SP Singh ◽  
LG Paleg
Keyword(s):  
Lipid Metabolism ◽  
Low Temperature ◽  
Gibberellic Acid ◽  
Lipid Biosynthesis ◽  
Phospholipid Synthesis ◽  
Acid Sensitivity ◽  
Amylase Production ◽  
Aleurone Tissue ◽  
Effect Of Inhibitors

The effects of six inhibitors, gammexane, diclofop-methyl, chlorpromazine, trifluoperazine, BASF 13-338 and SK&F 7997-A3, known to be involved in the inhibition of lipid biosynthesis, on the α-amylase response and lipid metabolism of the dwarf and tall wheats were examined. The results are discussed in the light of the proposed relationship between the rht alleles, phospholipid synthesis and gibberellic acid-sensitivity.

scholarly journals Duration of Low Temperature Exposure Affects Egg Hatching of the Colorado Potato Beetle and Emergence of Overwintering Adults

Insects ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 609
Author(s):  
Jianghua Liao ◽  
Juan Liu ◽  
Zhijian Guan ◽  
Chao Li
Keyword(s):  
Low Temperature ◽  
Colorado Potato Beetle ◽  
Treatment Time ◽  
Early Summer ◽  
Short Term ◽  
Egg Survival ◽  
Egg Hatching ◽  
Potato Beetle ◽  
Temperature Exposure ◽  
Low Temperature Exposure

The Colorado potato beetle is a serious pest of Solanaceae in China. In early summer, cold spells in later spring may occur for brief periods in the field environmental conditions, and temperatures often deviate far below the normal temperature for short periods, such as sudden short-term low temperature, may affect the development of Colorado potato beetle eggs. This paper studies the effects of low temperature stress at 8 °C for 0 d, 1 d, 3 d, 5 d, 7 d, and 10 d on the development of Colorado potato beetle eggs. Our results show that egg survival is significantly affected by short-term low temperature exposure. The percentage of eggs hatched is significantly affected by different treatment times (p = 0.000)—the percentage of eggs hatched decreases with increased treatment time, and Colorado potato beetles will extend the wintering time of their soil to resist the effects of lower temperatures. Thus, exposure of Colorado potato beetles to a short-term low temperature affects their emergence and population growth; this study could provide information for the occurrence, monitoring, and early warning of Colorado potato beetle during short-term temperature.

scholarly journals Study of low-temperature exposure on biotissue using an elongated cryoapplicator

2021 ◽  
Vol 2103 (1) ◽  
pp. 012049
Author(s):  
A V Pushkarev ◽  
N A Andreev
Keyword(s):  
Atrial Fibrillation ◽  
Data Analysis ◽  
Low Temperature ◽  
Nitrogen Dioxide ◽  
Liquid Nitrogen ◽  
Biological Tissue ◽  
The Novel ◽  
Treatment Data ◽  
Temperature Exposure ◽  
Low Temperature Exposure

Abstract The article presents the results of a study of low-temperature exposure on animal biological tissue using the novel prototype of a liquid nitrogen cryoapplicator. The data obtained are compared with the cryoapplicator characteristics cooled by nitrogen dioxide that are currently used for the atrial fibrillation treatment. Data analysis confirmed the liquid nitrogen cryoapplicators effectiveness and made it possible to highlight their advantages.

Importance of anther dehiscence for low-temperature tolerance in rice at the young microspore and flowering stages

2019 ◽  
Vol 70 (2) ◽  
pp. 113 ◽  
Author(s):  
Zuziana Susanti ◽  
Peter Snell ◽  
Shu Fukai ◽  
Jaquie H. Mitchell
Keyword(s):  
Low Temperature ◽  
Field Experiments ◽  
Recombinant Inbred Lines ◽  
Temperature Tolerance ◽  
Screening Methods ◽  
Genotypic Differences ◽  
Anther Dehiscence ◽  
Low Temperature Tolerance ◽  
Temperature Exposure ◽  
Low Temperature Exposure

Low temperature, particularly during the reproductive stage in rice (Oryza sativa L.), leads to reduced fertility and yield and is a major constraint faced in temperate rice ecology. The floral trait anther dehiscence length has not been quantified in relation to low-temperature tolerance in rice. Two controlled-temperature glasshouse experiments evaluated 120 genotypes from BC1F6 recombinant inbred lines when exposed to low air temperature at the booting (young microspore) and flowering stages. Genotypic differences existed for spikelet sterility (SS) after low-temperature exposure at booting and flowering stages, and a significant positive correlation (R2=0.22**) was found between SS of individual genotypes at booting and flowering stages. Number of dehisced anthers had the highest correlation with SS, and accounted for 58% and 44% of variation in SS with exposure to low temperature at booting and flowering, respectively. Anther dehiscence length and number of dehisced anthers were highly correlated (r=0.90**). After low-temperature exposure at booting, pollen number in the anther as well as the pollen’s capacity to germinate effectively further differentiated low-temperature-tolerant and -susceptible genotypes. Positive relationships (r=0.56** and 0.46*) between SS in the glasshouse and in field experiments in 2015 and 2016 seasons, respectively, provided validation of the phenotypic glasshouse screening methods utilised for low-temperature tolerance in relation to target production environments. This repeatable phenotyping system in combination with improved understanding of underlying floral traits will lead to increased efficiency in breeding for low-temperature tolerance in rice.

A novel α-amylase gene is transiently upregulated during low temperature exposure in apple fruit

2000 ◽  
Vol 267 (5) ◽  
pp. 1313-1322 ◽  
Author(s):  
Teresa Wegrzyn ◽  
Katrina Reilly ◽  
Guido Cipriani ◽  
Peter Murphy ◽  
Richard Newcomb ◽  
...  
Keyword(s):  
Low Temperature ◽  
Apple Fruit ◽  
Amylase Gene ◽  
Temperature Exposure ◽  
Low Temperature Exposure

How to effectively manage production facility low-temperature exposure risk

2017 ◽  
Vol 57 (2) ◽  
pp. 591
Author(s):  
Jim Bonini
Keyword(s):  
Low Temperature ◽  
Significant Risk ◽  
Evaluation Process ◽  
Phase Evolution ◽  
Gas Production ◽  
Mitigation Measures ◽  
Production Facility ◽  
Facility Design ◽  
Temperature Exposure ◽  
Low Temperature Exposure

A significant risk with any oil and gas production facility is equipment exposure to low temperature fluids, which can lead to brittle fracture, loss of hydrocarbon containment and ignition, with potential consequences including multiple fatalities, major asset damage, production deferment and profound operator reputational harm. Due to the nature of the initiating low-temperature events, which often occur as a result of a sequence of control system, hardware or operational failures, these issues are not always adequately addressed in facility design and operation, which can lead to unacceptable and potentially unacknowledged asset risk exposure. This is especially true in a cost-constrained environment where economic and schedule pressures can drive a leaner approach whereby, for example, traditional design margins are challenged. Drawing on S2V Consulting’s extensive expertise in this area, this technical paper outlines examples of typical low-temperature exposure mechanisms and key facility risk areas. It highlights why there can be failures in mitigating these risks, both during initial facility design and throughout subsequent operating phase evolution, discusses analytical methods or tools and highlights potential mitigation measures. A structured evaluation process developed by S2V Consulting is presented that can be adopted to effectively safeguard facilities by ensuring these risks are identified, screened, prioritised and managed to ALARP (as low as reasonably practicable). Finally, case studies are presented to provide context to the issue and demonstrate the effective application of the evaluation process to several current Australian production facilities.

Sign in / Sign up

Export Citation Format

Share Document