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Kim, Kwan Su,Park, Si Hyung,Jenks, Matthew A. Elsevier 2007 Journal of plant physiology Vol.164 No.9
<P><B>Summary</B></P><P>Sesame (<I>Sesamum indicum</I> L.) is one of the most important oilseed crops, having seeds and oil that are highly valued as a traditional health food. The objective of this study was to evaluate leaf cuticular wax constituents across a diverse selection of sesame cultivars, and the responses of these waxes to drought-induced wilting. Water-deficit was imposed on 18 sesame cultivars by withholding irrigation for 15d during the post-flowering stage, and the effect on seed yield and leaf waxes compared with a well-watered control. Leaf cuticular waxes were dominated by alkanes (59% of total wax), with aldehydes being the next-most abundant class. Compared to well-irrigated plants, drought treatment caused an increase in wax amount on most cultivars, with only three cultivars having a notable reduction. When expressed as an average across all cultivars, drought treatment caused a 30% increase in total wax amount, with a 34% increase in total alkanes, a 13% increase in aldehydes, and a 28% increase in the total of unknowns. In all cultivars, the major alkane constituents were the C27, C29, C31, C33, and C35 homologs, whereas the major aldehydes were the C30, C32, and C34 homologs, and drought exposure had only minor effects on the chain length distribution within these and other wax classes. Drought treatments caused a large decrease in seed yield per plant, but did not affect the mean weight of individual seeds, showing that sesame responds to post-flowering drought by reducing seed numbers, but not seed size. Seed yield was inversely correlated with the total wax amount (−0.466*), indicating that drought induction of leaf wax deposition does not contribute directly to seed set. Further studies are needed to elucidate the ecological role for induction of the alkane metabolic pathway by drought in regulating sesame plant survival and seed development in water-limiting environments.</P>
Jalal Ud Din,Sami Ullah Khan,Ahmad Khan,Abdul Qayyum,Kashif Sarfraz Abbasi,Matthew A Jenks 한국원예학회 2015 Horticulture, Environment, and Biotechnology Vol.56 No.6
A few degrees in temperature above the optimum can cause a considerable yield loss in tomatoes. A research experiment was conducted in which three tomato genotypes of (Solanum lycopersicum Mill.), ‘Suncherry Extra Sweet’ (Suncherry), ‘Walter’, and ‘CLN-2498d’, were evaluated for response to moderate high temperature at the reproductive stage. High temperature reduced the total number of fruits per plant, fruit size, number of seeds per fruit, seed setting, and relative ovule viability. However, high temperature increased proline accumulation and membrane thermo-stability in plant parts of the investigated genotypes. Fruit size and the number of seeds per fruit were reduced in all the genotypes, with the greatest reduction occurring in Suncherry. Similarly, viability of male and female gametes was also reduced in all of the investigated genotypes due to high temperature injury. The reduction in seed setting due to high temperature was greatest in ‘Suncherry’ and ‘Walter’, and least in ‘CLN-2498d’. Likewise, ovule viability was least reduced in ‘CLN-2498d’. The genotypes accumulating higher proline concentrations in reproductive parts and with enhanced membrane thermo-stability under high temperature likewise produced the highest fruit yield, and hence, exhibited high temperature tolerance.
한국 중화학산업(重化學産業)의 성장과 수출지향정책(輸出指向政策)
박승록,강정모,권진균 한국국제경제학회 1997 국제경제연구 Vol.3 No.2
한국의 주요 중화학산업인 산업화학, 기타화학, 석유정제, 기타석유제품, 철강, 비철금속, 조립금속제품, 일반기계, 전기전자, 수송기계 산업의 費用構造와 市場構造를 분석함으로써 한국의 경제성장과정에 있어서 중화학공업 육성정책의 功過와 産業政策的 意味를 살펴보았다. 본 연구에서는 한국 중화학산업의 비용구조를 短期均衡模型(short-run equilibrium model)을 통해 분석하면서, 중화학산업의 특성을 반영할 수 있도록 規模의 經濟(economies of scale) 市場支配力(market power)의 존재, 遊休資本設備(excess capacity)의 존재, 기업의 利潤 植大化 과정에서 국제무역의 존재로 인한 二重價格設定 메커니즘, 즉 국내시장과 해외시장의 價格差別(price discrimination)行爲를 모형에 반영하였다. 실증분석을 위해서는 일반화된 단기레온티에프 費用函數(short-run Leontief cost function)가 要素需要函數, 市場需要函數, 投資函數, 利潤極大化條件을 나타내는 행태방정식과 더불어 聯立方程式模型으로 정의되고 3단최소자승법으로 추정되었다. 중화학산업의 비용구조를 나타내는 모형의 추정결과부터 각 산업의 價格差別行爲가 규명되고, 規模의 經濟, 稼動率, 總要素生産性 變化, 市場支配力 정도가 측정되었으며, 이 결과로부터 중화학공업 육성정책, 수출지향정책의 고도경제성장에 대한 의미가 평가되었다.