• Journal of Plant Biotechnology
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• v.44 no.3
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• pp.296-302
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• 2017

Rice (Oryza sativa) cultivars show an impairment of growth and development in response to abiotic stresses such as drought, salinity, heat and cold at the early seedling stage. The tolerance to heat stress in plants has been genetically modulated by the overexpression of heat shock transcription factor genes or proteins. In addition to a high temperature-tolerance that has also been altered by elevating levels of osmolytes, increasing levels of cell detoxification enzymes and through altering membrane fluidity. To examine the heat tolerance in transgenic rice plants, three OsOPT10 overexpressing lines were characterized through a physiological analysis, which examined factors such as the electrolyte leakage (EL), soluble sugar and proline contents. We further functionally characterized the OsOPT10 gene and found that heat induced the expression of OsOPT10 and P5CS gene related proline biosynthesis. It has been suggested that the expression of OsOPT10 led to elevated heat tolerance in transgenic lines.

• Korean Journal of Poultry Science
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• v.43 no.4
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• pp.213-218
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• 2016

This study was conducted to investigate the effect of taurine supplementation on heat shock protein 70 and in vitro protein turnover in broiler chicks under chronic heat stress. Chicks were allocated into 3 groups of 10 birds per group; the control group was maintained at a temperature of $24^{\circ}C$ without taurine (CO group), the heat-stressed group maintained at a temperature of $34^{\circ}C$ without taurine (HO group), and heat-stressed group maintained at a temperature of $34^{\circ}C$ with taurine (HT group). The final body and liver weights of broilers in the HO and HT groups were significantly lower than those of broilers in the CO group (P<0.05). However, these parameters of the broilers in the HT group were significantly higher than those of broilers in the HO group (P<0.05). The heat shock protein 70 (hsp70) concentration in the liver of broilers in the HO group was significantly higher than that of broilers in the CO and HT groups, but the hsp70 concentration in the liver of broilers in the HT group was not different from that of broilers in the CO group. Liver homogenates of 21 day-old broilers were incubated at temperatures of $37^{\circ}C$ and $45^{\circ}C$ to prove the effect of high temperature and taurine on total protein syntheses. Neither high temperature nor taurine supplementation affected protein syntheses in liver homogenates of the broilers. However, the more the temperature increased, the more the degradation rates of cytoplasmic protein in liver homogenates increased; however, taurine supplementation had no effects on the protein syntheses in the liver of the broiler. It is possible that taurine indirectly affected protein turnover via various physiological mechanisms.

• Journal of the Korean Geographical Society
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• v.51 no.5
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• pp.633-649
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• 2016

Exposure to high temperatures during the reproductive period of crops decreases their productivity. The Intergovernmental Panel on Climate Change's (IPCC) fifth Assessment Report predicts that the frequency of high temperatures will continue to increase in the future, resulting in significant impacts on the world's food supply. This study evaluate climate change-induced heat stress on four major agricultural crops (rice, maize, soybean, and wheat) at a global level, using the coupled atmosphere-ocean model of Hadley Centre Global Environmental Model version 2 (HadGEM2-AO) and FAO/IIASA Global Agro-Ecological Zone (GAEZ) model data. The maximum temperature rise ($1.8-3.5^{\circ}C$) during the thermal-sensitive period (TSP) from the baseline (1961-1990) to the future (2070-2090) is expected to be larger under a Representative Concentration Pathway (RCP) 8.5 climate scenario than under a RCP2.6 climate scenario, with substantial heat stress-related damage to productivity. In particular, heat stress is expected to cause severe damage to crop production regions located between 30 and $50^{\circ}N$ in the Northern Hemisphere. According to the RCP8.5 scenario, approximately 20% of the total cultivation area for all crops will experience unprecedented, extreme heat stress in the future. Adverse effects on the productivity of rice and soybean are expected to be particularly severe in North America. In Korea, grain demands are heavily dependent on imports, with the share of imports from the U.S. at a particularly high level today. Hence, it is necessary to conduct continuous prediction on food security level following the climate change, as well as to develop adaptation strategy and proper agricultural policy.

• Korean Journal of Poultry Science
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• v.20 no.3
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• pp.151-159
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• 1993

An experiment was conducted to study the effects of nicarbazin supplementation (125 ppm) on the water balance, blood acid-base balance, and rectal temperature of 16 SCWL adult roosters in normal($21^{\circ}C$) and hot(35~$36^{\circ}C$) temperatures. There were 4 d of preliminary period, followed by 2 d of sampling and data collection period for each temperature treatment. The amounts of DM intake and excretion were not affected by heat stress but by rucarbazln supplementation. The DM metabolizability of diets, however, was decreased by nicarbazin. The amounts of water intake and evaporative water loss were increased in heat stressed birds. Nicarbazin increased further the amounts of water intake and evaporative water loss in hot temperature. Nicarbazin also decreased the blood p$CO_2$ and increased blood pH of heat stressed birds. The rectal temperature of the bird was increased in hot temperature, and the nicarbazin supplementation worsened this effect. Results indicate that heat stress raises the body temperature of the chicken. In order to suppress the rise of body temperature, the birds enhance the evaporative water loss through panting. The nicarbazin supplementation to heat stressed birds, however, increases the body temperature to such an extent that panting alone may not be able to return the body temperature back to normal.

• 월간낙농육우
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• v.31 no.8
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• pp.85-93
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• 2011

• 월간낙농육우
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• v.32 no.11
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• pp.94-101
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• 2012

• KOREAN POULTRY JOURNAL
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• v.44 no.7
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• pp.112-115
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• 2012

• KOREAN POULTRY JOURNAL
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• v.54 no.6
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• pp.172-175
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• 2022

• KOREAN POULTRY JOURNAL
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• v.52 no.6
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• pp.156-159
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• 2020

• The Korea Swine Journal
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• v.12 no.7 s.131
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• pp.150-154
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• 1990

스트레스 자극으로 작용하는 것은 밀사,환기불량,고온,암모니아,개스,싸움,군편성,사료급변 등인데 이런 자극인자를 제거하는 것이 생산성을 제고 할 수 있다.