• 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.

• International Journal of Industrial Entomology and Biomaterials
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• 제7권2호
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• pp.151-154
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• 2003

The effect of photoperiodic regimes on the oviposition and colony development of Bombus ignitus queens was examined with 0L, 8L, and 16L under $27^{\circ}C$ and 65% R. H. Among these photoperiod regimes, the oviposition rate at 8L and 16L was 80.2% and 83.1%, respectively, which was 12-15% higher than that at the dark condition (0L). Duration up to first oviposition at 8L and 16L was 17.5 days and 16.5 days, respectively, which was 2-3 days shorter than that at 0L. The colony foundation rate at 8L and 16L was 9.2% and 10.4%, respectively, which corresponded to 1.7-2.0-fold higher than the value at 0L. In addition, the rate of progeny-queen production at 8L and 16L was also two fold higher than that at 0L. Taken these together, the light conditions (8L and 16L) rather than dark condition (0L) were more suitable for oviposition and colony development for B. ignitus in the indoor rearing condition.

• 한국작물학회지
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• 제8권1호
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• pp.111-115
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• 1970

1) 본 실험은 Y.S.A. Gold leaf, oxford 1, Awha Yungzung, Samsun, Maruha, Hatano, 등 8개 품종을 온도와 일장 반응으로 본 것이다. 2) 온도는 저온을 야외(10~$20^{\circ}$) 고온을 온실($20^{\circ}C$~$35^{\circ}C$)에서 맞추었으며 일장은 8.10.12.14로 처리했다. 3) 이를 요약하면 1) 단일 조건에서는 고온보다 저온에서 장일조건에서는 저온보다 고온에서 개화가 촉진되었다. ii) 대체로 고온 장일에서 보다는 저온 단일에서 다소 개화가 촉진 되었다. iii) 그러나 위와 가튼 경향은 품종간에 많은 차이를 볼 수 있다.

• Journal of Plant Biology
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• 제19권1호
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• pp.14-18
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• 1976

Inhibition of flowering in Lemna perpusilla 6746 by 30 mM sucrose was reversed by the addition of acetylcholine (>$10^{-4}M) supplemented with 10^{-4}M$ ascorbic acid to 1/10-strength Hunter's growth medium. The reversible effect of acetylcholine was found to be greater at early stages of flowering than in the later period. Promotive effects of both acetylcholine ($10^{-3}M) and eserine(10^{-5}M$) on flowering in the short-day plant under various photoperiodic conditions were studied. It was indicated that the application decreased length of the critical dark period for the floral induction, and it was also shown that the endogenous status of acetylcholine was involved in the floral response which had a correlation with phytochrome. Interruption of inductive dark periods by red irradiation (1min) immediately followed by far-red light (1 min) completely inhibited flowering, while the addition of acetylcholine and eserine to the medium under the same condition slightly promoted flowering, indicating possible involvement of phytochrome system in acetylcholine activity for photoperiodic sensitivity of floral response in Lemna perpusilla 6746.

• Journal of Plant Biology
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• 제22권3호
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• pp.81-84
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• 1979

Catalase, glycolate oxidase, hydroxypyruvate and NADPH-glyoxylate reductases activities in cell free extracts from leaves of 3 cultivars, Suwon 264, IR 36 and Jin Heung of rice plants were studied at different growing stages. Catalase and glycolate oxidase shows inclining activities toward the maximum vegetative growth whereas declining activities in either the enzymes were noticed during the maturing stage. After the photoperiodic condition exhibit increasing hydroxypyruvate and NADPH-glyoxylate reductases activities with time until maturing stage. No significant differences were found in the enzyme activities, and in analytical data of nitrogen, chlorophyll contents, dry weight and soluble proteins among the 3 cultivars.

• 한국산림과학회지
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• 제88권4호
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• pp.523-532
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• 1999

본 연구는 자연 삼림욕장을 방문하기 어려운 장애인, 환자, 도시근로자들을 위하여 도시내 건물옥상 또는 유휴공간에 자연 삼림욕장의 기능을 대체할 수 있는 도시형 온실 삼림욕장을 개발하기 위하여 수행되었다. 시험용 저에너지 투입 이중비닐 삼림욕장을 축조하여 겨울철, 여름철 욕장환경을 조사하였으며, 이러한 욕장에 적합한 방향성 자생 및 외래 목, 초본식물들을 탐색하였다. 또한 후보식물들의 겨울철 저온, 여름철 고온에 대한 생장반응과 광주기 반응을 관찰하였다. 겨울철 이중비닐 욕장내 조절된 밤 최저온도는 $-2^{\circ}C$로써 대부분의 초본류는 동사하지는 않았으나 생장이 정지된 상태로 있다가 4월 초에 생장이 개시되었다. 외래초본 중 Catnip faassen's(Nepeta x faassenii)와 Lemon bergamot (Monarda citriodora)는 장일조건에서 생장이 촉진되었다. 이른봄 구상나무, 눈측백나무, 장백소나무와 같은 목본류의 생장율은 주로 밤 최저온도에 영향을 받았으며 광주기조건에는 큰 영향을 받지 않는 것으로 나타났다. 고온비닐온실에서 자생초본, 방아풀, 들깨풀, 배초향, 더덕은 16시간의 장일조건에서 생장이 촉진되었다. 소나무는 여름철 $40^{\circ}C$이상의 고온에서 수고생장 및 근원경생장이 억제되었다.

• 한국잠사곤충학회지
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• 제53권1호
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• pp.1-5
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• 2015

갈색거저리의 산업 활용도가 높아짐에 따라, 효율적인 실내 대량사육 시스템의 확립이 더욱 중요하게 인식되고 있다. 본 연구는 대량사육을 위해 다양한 범위의 온도, 광주기, 사육밀도에서 갈색거저리의 생리적 특성을 알아보고자 수행되었다. 갈색거저리 알은 $17.5{\sim}27.5^{\circ}C$에서 70% 이상의 부화율을 나타냈고, 부화기간은 $25{\sim}35^{\circ}C$에서 5~7 일로 조사되었다. 결과적으로, 부화율과 산란 전 기간(egg periods)을 고려했을 때, 대량사육을 위해 적절한 실내온도는 $25{\sim}27.5^{\circ}C$였다. 다양한 온도 조건하에서 대량사육 시스템에서 유충의 발육기간은 개별사육 시스템에서 보다 더 짧았다. 번데기 무게는 $20^{\circ}C$와 $25^{\circ}C$를 제외한 대량사육 시스템에서 좀 더 높게 관찰되었다. 수요 탄력성과 생산중량을 고려했을 때, 가장 효과적인 조건은 $25^{\circ}C$에서 대량사육한 실험군이었다. 14L : 10D의 광주기 조건에서 157.35일로 가장 짧은 유충기간을 나타냈다.

• Nuclear Engineering and Technology
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• 제2권3호
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• pp.179-183
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• 1970

Solanum andigena의 광주성 주기중의 방사성 콜레스테롤의 대사를 연구하였다. 대사산물로서 방사성 솔라닌과 그 가수분해물 솔라니딘을 분리 결정화하였으며, 콜레스테롤은 이 식물체 내에서 형성되는 에스테르화된 형태로 분리하였다. 단일 및 장일식물간의 콜레스테롤을 대사에는 뚜렷한 차이는 찾아 볼 수 없으나. 괴경중의 스테로이드 알카로이드에 콜레스테롤이 관여하고 있는 것으로 논의되었다.

• International Journal of Industrial Entomology and Biomaterials
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• 제6권1호
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• pp.21-25
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• 2003

The implications of temperature $(25, 30 and 35{\times}1^{\circ}C)$ and relative humidity $(60, 70 and 80{\times}2%)$ on the moulting pattern, moulting duration and moulting survival were studied in the silkworm, Bombyx mori L. Larvae of two pure silkworm breeds, Pure Mysore (PM) and NB$_4$D$_2$and their hybrid, $PM{\times}NB_{4} D_{2}$ were reared under experimental conditions under natural day photoperiodic (LD 12:12) condition. Two developmental marker events in the fourth moulting, settling for moult (SM) and completion of moult (CM) occurred at or around the middle of the photophase. The computed mean vector (equation omitted), based on the circular statistics also confirmed the above. Temperature and humidity did not alter the moulting rhythmicity much. However, extreme temperature and humidity conditions reduced moulting survival in PM and $PM {\times}NB_{4} D_{2}$. Further, moulting survival reduced below the economic level in $NB_{4} D_{2}$. The temperature and humidity together seem to exert synergic impact on the moulting survival of the silkworm Bombyx mori, at least in $NB_{4} D_{2}$.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.80-80
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• 2017

Teosinte is now known as a wild variety of corn. It is distributed in Central and South America. It is believed that teosinte contains genes for resistance to flooding because of the climate characteristics of the collected countries. Recent studies have shown that teosinte has the ability to form adventitious roots, to develop aerenchyma tissues of teosinte, and the resistance to toxic substances under flooding soil condition. Therefore, development of corn cultivars to cope with climate change and the growing corn at paddy field in Korea are required to introduce the characteristics of teosinte. However, in order to utilize teosinte resources, preconditions must be settled such as photoperiodic responsibility. Also if the preconditions are studied together with the metabolic level studies, the possibility of utilization will be even higher.