• ALGAE
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• 제17권2호
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• pp.83-87
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• 2002

Photosynthetic parameters of Scendesmus quadricauda, such as the maximum photosynthetic rate ($P_{max}$), photosynthetic efficiency (α) and the initial saturation intensity of irradiance for photosynthesis ($I_K$) were obtained using photosynthesis-irradiance (P-I) curve in a phosphorus-limited chemostat. S. quadricauda exhibitied no photoinhibition until at 200 μmol·$m^{-2}$ . $P_{max}$ (r=0.963, P=0.002) and $I_K$(r=0.904, P=0.013) showed linear relationships with growth rate. Chlorophyll-α concentration and cell dry weight decreased at higher growth rates, ut chlorophyll-α content per cell dry weight increased. The increase in photosynthetic rates at higher growth rates was due to the increase of $P_{max}$ and $I_K$ which was caused mainly by the increase in the absolute amount of chlorophyll-α rather than the increased photosynthetic efficiency of individual chlorphyll-α. The α did not show a significant relationship with growth rate (r=0.714, P=0.111). The cell quota of carbon (r=0.554, P=0.254) was not correlated with growth rate, but cell quota of nitrogen (r=0.818, P=0.047) and phosphorus (r=0.855, P=0.030) exhibited linear correlations with growth rate.

• 한국농림기상학회지
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• 제9권1호
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• pp.55-60
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• 2007

무궁화 품종별 생장특성을 조사한 결과 수고는 불새 품종이 가장 높았고, 소양 품종이 가장 작은 값을 나타내었으며, 분지와 잎의 수는 백단심${\times}$경북1 품종이 가장 많았다. 무궁화 품종별 꽃 특성을 조사한 결과 선덕과 불새 품종의 화폭과 화고는 가장 높은 값을 보였으며, 소양 품종이 가장 작은 값을 나타내었다. 전반적으로 엽록소 함량(a, b, a+b)의 품종별 차이는 선덕과 불새 품종에서 가장 근소한 것으로 나타났다. 백단심${\times}$경북1과 소양 품종은 불새와 선덕 품종에 비하여 광보상점과 광포화점이 낮았으며, 암호흡 및 광합성능력 그리고 순량지수율도 모두 낮은 것으로 분석되었다. 이러한 결과로 비추어 볼 때, 무궁화 품종 백단심${\times}$경북1과 소양은 분화용으로서의 개발 가능성이 높은 것으로 평가된다.

• Journal of Ecology and Environment
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• 제47권3호
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• pp.85-102
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• 2023

Background: Ecophysiological characteristics of Rosa rugosa were analyzed under different environmental factors from May to October 2022. Photosynthesis, chlorophyll fluorescence, chlorophyll content, leaf water content (LWC), osmolality, carbohydrate content, and total ion content were measured to compare the physiological characteristics of R. rugosa at two study sites (i.e., in large pots and in the Goraebul coastal sand dune area). Results: When R. rugosa was exposed to high temperatures, photosynthetic parameters including net photosynthetic rate (P_N) and stomatal conductance (g_s) in both experiment areas declined. In addition, severe photoinhibition occurs when R. rugosa is continuously exposed to high photosynthetically active radiation (PAR), and because of this, relatively low Y(II) (i.e., the quantum yield of photochemical energy conversion in photosystem II [PSII]) and high Y(NO) (i.e., the quantum yield of non-regulated, non-photochemical energy loss in PSII) in the R. rugosa of the pot were observed. As the high Y(NPQ) (i.e., the quantum yield of regulated non-photochemical energy loss in PSII) of R. rugosa in the coastal sand dune, they dissipated the excessed photon energy through the non-photochemical quenching (NPQ) mechanism when they were exposed to relatively low PAR and low temperature. Rosa rugosa in the coastal sand dune has higher chlorophyll a and carotenoid content. The high chlorophyll a + b and low chlorophyll a/b ratios seemed to optimize light absorption in response to low PAR. High carotenoid content played an important role in NPQ. As a part of the osmotic regulation in response to low LWCs, R. rugosa exposed to high temperatures and continuously high PAR used soluble carbohydrates and ions to maintain high osmolality. Conclusions: We found that F_v/F_m was lower in the potted plants than in the coastal sand dune plants, indicating the vulnerability of R. rugosa to high temperatures and PAR levels. We expect that the suitable habitat range for R. rugosa will shrink and move to north under climate change conditions.

• 식품보건융합연구
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• 제6권1호
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• pp.17-20
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• 2020

Wheat is the most abundant crop in the world, accounting for one third of the world's population diet. In Ukraine, wheat is in fact, in addition to its nutritional value, a national symbol of the state. Therefore, the main thesis on the development of modern plant growing in Ukraine is the reduction of costs and the introduction of innovative technologies. The quality of grain and seed depends on many factors, namely: agro-climatic conditions, sowing condition of the seed material, quality characteristics of the soil, yielding properties of seeds, pre-sowing seed treatment. etc. For this purpose, the photosynthesis and intensity of photosynthesis need to be limited to the width of the leaf and the height of the leaves by a smaller cut of the stem. It is extremely important to ensure that the head and side pagons of wheat are in good condition. All parameters are often secured by the technology of grain preparation before delivery. Prior to this technology, it is possible to introduce processing of the material in the form for the development of the material. This article presents the effectiveness of the use of infrared irradiation for the pre-sowing treatment of winter wheat seeds in Sekobra Research, Germany.

• 현장농수산연구지
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• 제22권2호
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• pp.17-22
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• 2020

This study was conducted to find out the optimum composition of nursery soil for raising seedling of Zelkova serrata. The treatments were regulated with the three different soil types : full peat moss(PM 100%), peat moss + perlite + vermiculite(1:1:1), peat moss + perlite + vermiculite(1:2:1). The full peat moss(PM 100%) showed the highest photosynthetic activity such as maximum photosynthesis rate(PN max), water use efficiency(WUE), Fv/Fm, PIabs and SPAD value. And also, full peat moss(PM 100%) showed relatively better growth performances. As a result of surveying the whole experiment, full peat moss(PM 100%) soil increases growth performances and enhances overall quality.

• 한국약용작물학회:학술대회논문집
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• 한국약용작물학회 2007년도 춘계학술발표회
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• pp.133-134
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• 2007

• 한국약용작물학회:학술대회논문집
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• 한국약용작물학회 2010년도 심포지엄 및 추계학술발표회
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• pp.183-184
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• 2010

• 한국약용작물학회:학술대회논문집
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• 한국약용작물학회 2010년도 심포지엄 및 추계학술발표회
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• pp.229-230
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• 2010

• Animal cells and systems
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• 제4권4호
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• pp.325-328
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• 2000

Parthenin was extracted from Parthenium hysterophorus L. leaves growing in northern part of India, and its effect was tested on the seed germination parameters and other related characteristics of Ageratum conyzoides L. weed. Parthenin proved phytotoxic to A. conyzoides as most of the studied parameters were inhibited. It may lead to a possible biological eradication of the A. cpnyzoides weed.

• 한국농림기상학회지
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• 제15권3호
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• pp.145-152
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• 2013

지구온난화와 같은 기후변화에 대한 백합나무의 생리적 적응반응을 구명하기 위해서, $CO_2$ 농도 및 기온 상승이 백합나무의 생리특성에 미치는 영향을 조사하였다. 그 결과 $CO_2$ 농도 및 기온 상승에 의하여 백합나무의 동화기관을 비롯한 모든 기관의 생장이 촉진되었다. 그러나 광합성능력과 관련된 광합성색소의 함량, 광화학계 및 탄소고정계의 활성 등은 일반 대기조건에서 생장한 개체와 유사한 값을 나타내, 광합성능력의 변화가 없었음이 시사되었다. $CO_2$ 농도 및 기온 상승에 의한 증산속도의 상승으로 광합성에 대한 수분이용효율이 저하하였다. 그러나 측근 생장이 촉진되어 뿌리에 대한 동화기관의 비율이 낮아지는 반응이 나타나 수분흡수능력이 높아졌음을 확인하였다. 또한 잎이 두꺼워지고 치밀해지는 형태적 변화가 나타나고, 수분 손실에 대한 잎의 저항능력이 증대되었음이 확인되었다. 이러한 결과로 $CO_2$ 농도 및 기온 상승에 의하여 백합나무의 수분 스트레스에 대한 저항능력이 증대됨을 알 수 있다.