THE ROLE OF THE PITUITARY IN THE RESISTANCE OF THE GOLDFISH (CARASSIUS AURATUS L.) TO A HIGH TEMPERATURE

1967 ◽  
Vol 45 (3) ◽  
pp. 329-345 ◽  
Author(s):  
Peter H. Johansen
Keyword(s):  
High Temperature ◽  
Heat Resistance ◽  
Carassius Auratus ◽  
Essential Role ◽  
High Temperature Stress ◽  
Heat Resistant ◽  
Goldfish Carassius Auratus ◽  
Normal Fish ◽  
Resistance Tests

The heat resistance of normal, hypophysectomized and pituitary-autotransplanted goldfish acclimated to 20 °C under 16-h photoperiod and 8-h photoperiod conditions was determined. It was found that hypophysectomized goldfish were less heat resistant than normal fish and that those with an autotransplanted pituitary were as heat resistant as normal fish.The photoperiod results, though inconclusive, suggest that normal 16-h photoperiod fish are more heat resistant than normal 8-h photoperiod fish and that only the fish with a normal pituitary can respond to photoperiod changes. The fish without a pituitary are slightly less heat resistant than normal 8-h-photoperiod fish, while those possessing an autotransplanted pituitary are as resistant to a high temperature as normal 16-h-photo period fish.Treatment of hypophysectomized goldfish with luteinizing, thyrotropic, adrenocorticotropic, and lactotropic (prolactin) hormones and crude salmon pituitary extract appeared not to affect resistance to a high temperature.In the experiments involving pituitary autotransplantation, a study was made of various organs influenced by pituitary secretions to determine the pattern of hormone output by the pituitary. By contrasting this information with that of the heat resistance tests, various hormones have been suggested as not playing an essential role in high temperature resistance. The hypothesis is put forward that a prolactin-like hormone plays the essential role in resisting a high-temperature stress.

scholarly journals THE EFFECT OF DIETARY FAT ON THE HEAT TOLERANCE OF GOLDFISH (CARASSIUS AURATUS)

1949 ◽  
Vol 27d (2) ◽  
pp. 85-91 ◽  
Author(s):  
W. S. Hoar ◽  
J. E. C. Dorchester
Keyword(s):  
High Temperature ◽  
Melting Point ◽  
Heat Resistance ◽  
Heat Tolerance ◽  
Iodine Value ◽  
Dietary Fat ◽  
Carassius Auratus ◽  
Factors Associated ◽  
Goldfish Carassius Auratus ◽  
Degree Of Unsaturation

Three groups of goldfish were fed diets containing 25% fat. The diets for the three groups differed in the degree of unsaturation of these fats. Pilchard oil (iodine value 181.7), herring oil (iodine value 128.4), and lard (iodine value 66.2) were the fats used. Heat tolerance of the fish was then tested by holding them at a constant high temperature and observing the time of death. Variations in the ability of the groups to withstand high temperature were correlated with differences in the degree of unsaturation of their extracted fats. The iodine value of the herring oil diet was very close to that of the fats of the goldfish prior to feeding and no change in the value for fish fed on this diet was observed. Each of the other two diets changed the degree of unsaturation of the goldfish fats by approximately 54% of the maximum theoretical change. These changes modified the heat resistance of the fish. The degree of modification of heat tolerance, however, cannot be strictly correlated with the degree of change of unsaturation of fats and it is concluded that factors associated with differences in melting point rather than melting point of the fat itself are probably involved in heat resistance.

scholarly journals Plant Responses and Tolerance to High Temperature Stress: Role of Exogenous Phytoprotectants

2015 ◽  
pp. 385-435 ◽  
Author(s):  
Kamrun Nahar ◽  
Mirza Hasanuzzaman ◽  
Kamal Uddin Ahamed ◽  
Khalid Rehman Hakeem ◽  
Munir Ozturk ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Stress ◽  
High Temperature Stress ◽  
Plant Responses

HIGHLY HEAT-RESISTANT SILICONE RUBBER COMPOSITIONS (review)

2020 ◽  
pp. 31-37
Author(s):  
S.N. Semenova ◽  
◽  
A.M. Chaykun ◽  
Keyword(s):  
High Temperature ◽  
Heat Resistance ◽  
Flame Retardant ◽  
Fire Resistance ◽  
Silicone Rubber ◽  
Technical Literature ◽  
Temperature Resistance ◽  
Heat Resistant ◽  
High Temperature Resistance ◽  
Scientific Technical

A review of the scientific technical literature in the field of modern research on silicone rubber compositions with high temperature resistance, including those with fire-resistant properties, is presented. The polymer bases and heat-stabilizing and flame-retardant additives used in the developments, as well as methods for preparing rubber mixes and rubbers are shown. Features of compounding materials with a combination of heat resistance and fire-resistance are noted. The relevance of research for the needs of aviation equipment is shown.

CHANGES IN ANTIOXIDANT ISOZYMES AS A BIOMARKER FOR CHARACTERIZING HIGH TEMPERATURE STRESS TOLERANCE IN RICE (ORYZA SATIVA L.) SPIKELETS

2012 ◽  
Vol 49 (1) ◽  
pp. 53-73 ◽  
Author(s):  
SMRUTI DAS ◽  
P. KRISHNAN ◽  
MONALISA NAYAK ◽  
B. RAMAKRISHNAN
Keyword(s):  
High Temperature ◽  
Stress Tolerance ◽  
Temperature Stress ◽  
Oryza Sativa L ◽  
High Temperature Stress ◽  
Spikelet Sterility ◽  
Antioxidant Metabolism ◽  
Different Temperatures ◽  
Temperature Exposure

SUMMARYHigh temperature stress at flowering can adversely affect rice yield, largely due to failure of fertilization. Oxidative damage can be a major reason inducing spikelet sterility in rice. In the present study, the effect of high temperatures on antioxidant metabolism in rice spikelets was characterised using nine different genotypes. Exposure to different temperatures at flowering stage revealed significant differences among various antioxidant enzymes in spikelets, both quantitatively and qualitatively. Spikelets of susceptible genotypes withstood temperature stress of up to 35 °C, those of moderately tolerant between 35 °C and 38 °C and those of tolerant genotypes up to 40 °C. Presence or absence, and changes in the isozyme intensities were consistent with alterations in their activities. Superoxide dismutase (SOD) isozymes II and III were present after exposure at 30 °C and 35 °C, while SOD I appeared above 40°C. Intensities of catalase isozymes I and III and the only isozyme of ascorbate peroxidase altered, while the only isozyme of guaical peroxidase and two (III and IV) of the four isozymes of catechol peroxidase disappeared after high temperature exposure of 45 °C. Thus, this work provides an evidence of the role of antioxidant metabolism in spikelets under high temperature stress conditions. Hence, changes in antioxidant isozymes in rice spikelets can be used as a biomarker for characterizing high temperature stress tolerance in rice spikelets.

scholarly journals Linkage analysis, GWAS, transcriptome analysis to identify candidate genes for rice seedlings in response to high temperature stress

2021 ◽  
Author(s):  
Zhaoran Wei ◽  
Qiaoling Yuan ◽  
Hai Lin ◽  
Xiaoxia Li ◽  
Chao Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
Linkage Analysis ◽  
Candidate Genes ◽  
Transcriptome Analysis ◽  
Recombinant Inbred Lines ◽  
High Temperature Stress ◽  
Seedling Stage ◽  
High Temperature Treatment ◽  
Heat Resistant ◽  
Resistant Genes

Abstract Background: Rice plants suffer from the rising temperature which is becoming more and more prominent. Mining heat-resistant genes and applying them to rice breeding is a feasible and effective way to solve the problem.Result: Three main biomass traits, including shoot length, dry weight, and fresh weight, changed after abnormally high temperature treatment in the rice seedling stage of a recombinant inbred lines and germplasm population. Based on a comparison of the results of linkage analysis and genome-wide association analysis, two loci with lengths of 57 kb and 69 kb in qDW7 and qFW6, respectively, was associated with the rice response to abnormally high temperatures in the seedling stage. Meanwhile, based on integrated transcriptome analysis, some genes are considered as important candidate genes. Combining with known genes and analysis of homologous genes, it was found that there are eight genes in candidate intervals that need to be focused in subsequent research.Conclusions: The results indicated several relevant loci, which would help researchers to further discover beneficial heat-resistant genes that can be applied to rice heat-resistant breeding.

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