• 한국작물학회지
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• 제49권3호
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• pp.194-198
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• 2004

본 연구는 남서해안 간척지에서 토양 염농도(저염; 0.1%, 중염; 0.3∼0.4%)별로 쌀 품질 향상을 위한 적정 질소 시비량을 구명하기 위하여 시험한 결과를 요약하면 다음과 같다. 1.유추분화기의 초장은 질소 시비량이 많을수록 컸고, 토양염농도간에는 저염 토양에서 켰다. 2. 출수기는 저염 토양에서는 표준비인 N20kg/10a에 비해 N8-N16kg/10a까지는 같았으나 N24kg/10a에서는 1일 늦었고, 중염 토양에서는 N8-N16kg/10a 까지는 1일이 삘랐고 N24kg/10a에서는 같았으며, 토양 염농도간에는 저염 토양에서보다 중염 토양에서 4일 정도 늦었다. 3. 질소시비량이 많을수록 간장이 크고, 포장도복이 심했다. 4. 저염 토양에서 질소시비량이 많을수록 $\textrm{m}^2$ 당 립수는 많았으나 등숙비율이 낮아져 발 수량은 N12kg/10a이상에서는 유의차가 없었으며, N12kg/10a이하에서 현미의 완전미율이 높고 단백질 함량이 낮았다. 5.중염 토양에서는 질소시비량이 많을수록 $\textrm{m}^2$ 당 립수가 많고 등숙비율이 비슷하여 발 수량은 질소시비량이 많을수록 높았으나 N20kg/10a 이상에서는 유의차가 없었고, 현미의 완전미율과 단백질함량은 질소시비량간에 비슷하였다. 따라서 남서해안 간척지에서 쌀 수량 및 미질 등을 고려해 볼 때, 저염 토양에서는 N12kg/10a, 중염 토양에서는 N20kg/10a이 적당할 것으로 생각된다

• Journal of Microbiology and Biotechnology
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• 제29권9호
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• pp.1453-1459
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• 2019

Zeaxanthin is an important pigment in the photo-protection mechanism of microalgae. However, zeaxanthin epoxidase, an enzyme involved in the accumulation and conversion of zeaxanthin, has not been extensively studied in microalgae. In this work, we report the expression pattern of zeaxanthin epoxidase in Dunaliella tertiolecta (DtZEP) at different light and diverse salinity conditions. To confirm the responsiveness to light conditions, the ZEP expression pattern was investigated in photoperiodic (16 h of light and 8 h of dark) and continuous (24 h of light and 0 h of dark) light conditions. mRNA expression levels in photoperiodic conditions fluctuated along with the light/dark cycle, whereas those in continuous light remained unchanged. In varying salinity conditions, the highest mRNA and protein levels were detected in cells cultured in 1.5 M NaCl, and ZEP expression levels in cells shifted from 0.6 M NaCl to 1.5 M NaCl increased gradually. These results show that mRNA expression of DtZEP responds rapidly to the light/dark cycle or increased salinity, whereas changes in protein synthesis do not occur within a short period. Taken together, we show that DtZEP gene expression responds rapidly to light irradiation and hyperosmotic stress. In addition, ZEP expression patterns in light or salinity conditions are similar to those of higher plants, even though the habitat of D. tertiolecta is different.

• 한국해양환경ㆍ에너지학회지
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• 제16권2호
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• pp.138-142
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• 2013

저염분에 따른 양식생물의 피해를 줄이기 위한 조기경보 방안으로 염분에 따른 굴(Crassostrea gigas) 패각운동 특성을 홀 소자를 이용하여 측정하는 생물모니터링시스템의 적용 가능성을 조사하였다. 염분농도 27 psu에서 굴의 패각운동은 평균 10-15 mm 정도의 개각상태를 유지하다가, 비교적 빠른 폐각상태를 지시하는 큰 파형이 보였으며, 다시 개각상태로 돌아가나, 그 속도는 폐각상태로 진행되는 속도보다 느리게 나타났다. 20 psu까지 저염분의 농도에서는 27 psu의 패각 운동과 큰 변화가 없었다. 하지만 17 psu 이하의 염분농도부터 이상 패각운동이 지시되었으며, 10 psu에서는 패각운동이 없이 폐각상태를 유지하였다. 이와 같은 생물모니터링시스템을 패류 양식에 활용하여 해양환경의 이상변동을 신속히 감지할 수 있다면, 어업피해를 감소시킬 활동으로 연결될 것으로 기대된다.

• 수산해양기술연구
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• 제34권2호
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• pp.159-164
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• 1998

In order to investigate the relation between the environmental factors influencing on the fluctuation of fishing condition and the catch of anchovy in gill nets in the coastal waters of Yosu, five oceanographic factors, i.e., water temperature, salinity, chlorophyll-a and the catch of anchovy in gill nets are observed from June 6 to August 12 in 1993. The results obtained are summerized as follows: 1) The water temperature ranged from 16.$0^{\circ}C$ to 22.6$^{\circ}C$ and the salinity from 30.13$\textperthousand$ to 33.65$\textperthousand$. the water temperature and salinity showed no significant influence on the catch of anchovy, but the catch did not expose high values in low temperature and salinity. 2) The catch of anchovy increased with the amount of chlorophyll-a. It is therefore emphasized that the amount of chlorophyll-a is the greatest one of environmental factors influencing on the catch of anchovy.

• 해양환경안전학회지
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• 제23권6호
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• pp.684-689
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• 2017

본 연구는 참굴(Crassostrea gigas)의 패각운동을 이용하여, 연안역에서 발생하는 저염수에 대한 조기경보가능성을 살펴보았다. 30 psu와 20 psu에서 패각운동은 각각 $7.32{\pm}3.21$회/hr와 $7.11{\pm}3.90$회/hr였으며, 파형과 횟수는 차이가 없었다(t-test, p>0.001). 하지만 10 psu와 5 psu에서는 모든 개체가 폐각상태를 지속하였다. 수온과 염분의 복합실험결과, Group 1(수온 $15^{\circ}C$ ${\times}$ 염분 15 psu)은 20~30 psu에서 보인 패각운동 후(약 2~3시간), 장시간 폐각을 하였다. Group 2(수온 $30^{\circ}C$ ${\times}$ 염분 15 psu)에서는 Group 1의 패각 개폐운동보다 더 빠르고 자주 나타나, 참굴의 생리적인 위기상황에 대한 신호를 나타내었다. 따라서 이러한 파형은 하계 저염수 출현 시 나타낼 수 있는 조기경보 신호로 충분히 활용될 수 있을 것으로 보인다.

• 상하수도학회지
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• 제25권4호
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• pp.453-462
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• 2011

This study was analyzed to determine the cause of red tide at 10 and 30 days antecedental rainfall, stage and discharge in the Taehwa River, tidal data of Ulsan port, also, it was analyzed variation of red tide population, salinity, BOD, COD, T-N, T-P at S1, S2 each point. Most of the red tide in the Taehwa River occurred by provision of proper nutrients with antecedent, the proximity between discharge and low-flow capacity, and stage and discharge of stabilized condition after the sea water was inflowed by maximum tide difference. Red tide population is not nearly related to the change of salinity, the Taehwa River seems specific features of Non-coastal rivers downstream, because red tide was occurred when salinity quite low-end condition.

• 한국수산과학회지
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• 제43권2호
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• pp.139-145
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• 2010

This study investigated the optimum salinity and temperature conditions for mass culture of the brackish water flea, Diaphanosoma celebensis. Community and individual cultures of flea were maintained in 1 L beakers and 3 mL vessels (of a 12-well culture plate), respectively, and fed green algae, Tetraselmis suecica. In salinity experiments ranging from 5 to 34 psu, continuous growth of flea populations was found up to 34 psu. However, the specific growth rate and life span of females showed decreasing tendencies with the increase of salinity. The highest maximum density and offspring number were 33.6 individuals (ind.)/mL and 55.3 ind. at 10 psu, respectively. In the temperature experiments ranging from 20 to $40^{\circ}C$, population growth of D. celebensis increased continuously until $35^{\circ}C$ and then decreased over $40^{\circ}C$. The specific growth rate was significantly higher at 25 and $30^{\circ}C$ than at 20 and $40^{\circ}C$. Female life span tended to decrease with temperature increase. The highest maximum density and offspring number were 52.3 ind./mL and 46.0 ind. at $30^{\circ}C$, respectively. These results suggest that the optimum salinity and temperature for mass culture of D. celebensis may be 10 psu and $30^{\circ}C$, respectively.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.189-189
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• 2017

Salinity is one of the major abiotic stresses that severely affect crop production throughout the world; especially rice plant which is generally categorized as a typical glycophyte as it cannot grow in the presence of salinity. Phenotypic resistance of salinity is expressed as the ability to survive and grow in a salinity condition. Salinity resistance has, at least implicitly, been treated as a single trait. Physiological studies of rice suggest that a range of characteristics (such as low shoot sodium concentration, compartmentation of salt in older rather than younger leaves, high potassium concentration, high $K^+/Na^+$ ratio, high biomass and plant vigour) would increase the ability of the plant to cope with salinity. Criteria for evaluating and screening salinity tolerance in crop plants vary depending on the level and duration of salt stress and the plant developmental stage. Plant growth responses to salinity vary with plant life cycle; critical stages sensitive to salinity are germination, seedling establishment and flowering. We have established a standard protocol to evaluate large rice germplasms for overall performance based on specific physiological traits for salt tolerance at seedling stage. This protocol will help in identifying germplasms which can perform better in the presence of different salinity treatments based on single trait and also combination of different physiological traits. The salt tolerant germplasm can be taken forward into developing better varieties by conventional breeding and exploring genes for salt tolerance.

• 한국해안해양공학회지
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• 제3권4호
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• pp.185-196
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• 1991

좌표변환된 측방향 평균 X-Z 수치모형을 수립하여 하구에서 염도확산을 분석하였다. 중력항과 깊이에 따른 밀도변화에 대한 검토와 염도 경계조건의 재평가 등이 이루어 졌으며, 특히 지배방정식중 확산항의 처리에 시간분별방법(fractional step method)을 이용하여 수치해의 안정성 및 간편성을 도모하였다. 개발된 모형을 금강하구에 실제 적용하여 Manning 계수·확산계수 등의 물리적 및 수치적인 특성을 조명하였고, 염도 확산범위를 비롯하여 갈수기의 영향과 대조 및 소조시 염도분포도 파악하였다.

• 한국작물학회지
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• 제48권4호
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• pp.339-344
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• 2003

To identify the new source of breeding materials for rice salt tolerance, the salinity tolerance of thirty-four varieties was evaluated under 0.5% saline condition at seedling stage. The salinity score showed highly significant correlations to dry weight and dead leaf ratio. The tested varieties were classified into three groups by visual score, reduction ratio of dry weight, and dead leaf ratio. Eighteen varieties were classified as the highly tolerant group (salinity scores of 1.3-3.7), seven varieties were fallen into the tolerant group (salinity scores of 4.2-5.8), and others were susceptible (salinity scores of 6.7-9.0). In highly tolerant group, most indica varieties including Getu, Dikwee and Kuatic Putic, didn't exsert a panicle under the Korean climate. But six varieties, Xiangcho V, Annapuruna, HP 3319-2wx-6-3-1, Giza 175, and GZ 2447-S-17, GZ 4255-6-3 were suitable to the Korean climate, and their heading date (6-16, August) and culm length (65-78㎝) were similar to the Korean varieties. Accordingly, these varieties can be utilized as crossing materials for the salt tolerance in japonica rice.