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Yang Gyu Ku,David Woolley,Michael Nichols 한국원예학회 2007 Horticulture, Environment, and Biotechnology Vol.48 No.1
Effects of repeated application of N-(2-chloro-4-pyridyl)-N'-phenylurea (CPPU) to foliage of asparagus seedlings on cladophyll morphology using growth analysis were investigated. Seven-week-old asparagus seedlings cvs. ‘Jersey Giant’ and ‘UC 157’ were sprayed to run off with CPPU at 10 mgㆍL?¹. Untreated seedlings were sprayed with tap water. The application of CPPU or tap water were repeated after 4, 8, and 12 weeks. Repeated CPPU foliar sprays significantly increased cladophyll area and cladophyll dry weight, but decreased root dry matter and the number of buds. Despite the higher cladophyll area, CPPU did not increase photosynthetic efficiency as measured by relative growth rate and net assimilation rate. ‘UC 157’ produced more bud numbers than ‘Jersey Giant’, but root dry weight did not differ between the two cultivars. ‘UC 157’ and ‘Jersey Giant’ had similar relative growth rates and net assimilation rates.
Yang Gyu Ku,Sung-Ju Ahn,Yeon-Ok Kim 한국원예학회 2021 원예과학기술지 Vol.39 No.3
Cadmium (Cd) and lead (Pb) are toxic even in small quantities and decrease crop yields. They are easily absorbed by plant roots, and thus enter the food chain, risking human health. Radish (Raphanus sativus L.) is a widely consumed root vegetable in Korea. Therefore, it is important to screen for a radish cultivar that exhibits low Cd and Pb accumulation and elucidate the Cd and Pb tolerance mechanism. In this study, we determined the effect of Cd and Pb stress on germination and growth in four radish cultivars, ‘Gaulgeojang’ (AG), ‘Iseogaul’ (IG), ‘Chongryong’(CR), and ‘Supertogwang’ (ST). Furthermore, Cd and Pb concentrations, production of nonprotein thiols (NPTs), and hydrogen peroxide (H₂O₂) levels were investigated in four cultivars of radish seedlings under Cd and Pb treatments. The cultivars showed tolerance to Cd and Pb stress during germination and seedling growth in the following order: CR > S T > IG > AG. CR, a tolerant cultivar, accumulated less Cd in roots and less Pb in both roots and shoots than the other cultivars. In contrast, AG, a sensitive cultivar, exhibited greater Cd and Pb accumulation in roots than the other cultivars. Cd and Pb treatments significantly increased the NPTs in all four cultivars; the highest level was found in CR. Cd and Pb treatments also increased H₂O₂ levels in all cultivars; the highest and lowest levels were observed in AG and CR, respectively. These results indicate that the greater Cd and Pb tolerance of CR may be attributable to its higher potential to limit Cd and Pb accumulation and to form complexes of metal-binding ligands with Cd and Pb. The results of this study provide information for the selection of the safest of the four common radish cultivars for growth in Cd- and Pb-contaminated soils.
Yang-Gyu Ku(구양규),Won Park(박원),Jin-Ki Bang(방진기),Young-Seok Jang(장영석),Yong-Beom Kim(김용범),Hyun-Jong Bae(배현종),Mi-Chung Suh(서미정),Sung-Ju Ahn(안성주) (사)한국생물환경조절학회 2009 시설원예‧식물공장 Vol.18 No.2
단기간 침수처리에 의한 유채의 영양쟁장과 생식생장기의 생리적 반응, 지방산 조성과 수확량에 관하여 조사하였다. 영양생장 단계에서 10일과 생식생장 단계에서 4일 침수한 결과를 영양생장과 생식생장기 모두 광합성, 기공전도도와 증산량은 침수처리 기간과 회복시기에 현저하게 감소하였다. 침수처리가 끝난 처리구에서 광합성과 기공전도도는 2~3일 내에 대조구와 비슷한 경향을 보였다. 침수처리된 작물의 지방산 조성은 대조구에 비해 통계적 유의성의 차이를 보이지 않았지만 수확량과 관련된 요인들에서 현저하게 감소함으로 생식생장 단계에서의 단기간 침수처리가 수확량 요인에 큰 영향을 줌으로서 종지 수확량에 영향을 미칠 것으로 사료된다. The effects of short-term waterlogging on physiological responses, fatty acid compositions and yield components of rapeseed at both the vegetative growth and the reproductive growth stages were assessed in this study. Waterlogged plants were treated for a period of 10 days at the vegetative growth stage and 4 days at the reproductive growth stage. The results show that photosynthesis and stomatal conductance at both the vegetative growth and the reproductive growth stage were significantly reduced during the waterlogging period and after the recovery period. When the plants were removed from water, photosynthesis and stomatal conductance progressively restored similar values to those of control plants within 2~3 days. Fatty acid compositions were unaffected by waterlogging treatment. However, yield components (pod number and pod length) of the waterlogged treated plants at the reproductive growth stage were significantly reduced. These results suggest that short-term waterlogging may thus influence oilseed yield component.
Yang-Gyu Ku,Sun-Young Yang,Yong-Su Jung,Jang-Ock Kim,Young-Seok Jang,Mi-Chung Suh,Sung-Ju Ahn 한국작물학회 2008 한국작물학회 학술발표대회 논문집 Vol.2008 No.10
Brassica napus L. (Brassicaceae) plantation has increased as its seed is the primary source for bio-diesels. This study was conducted Male sterile (MS) line (cv. 'Sun-Mang') to pollen parent (cv. 'Mokpo 64') ratio of rape plants on fatty acid compositions of six sequential stages and yield performances. Ratio of MS line to pollen parent was followed, 4:2, 10:1, and 10:2, respectively. Seeds of six sequential stages (35, 40, 45, 50, 55, and 60 days after flowering) were collected and determined using SEED FAME ESTIMATION. The results showed that oleic acid content (C18:1) of the MS to pollen parent ratio (4:2) relatively increased up to 60 days after flowering compared to other ratios. Other fatty acid compositions such as palmitic acid (C16:0), stearic acid (C18:0), linoleic acid (C18:2) and linolenic acid (C18:3) contents decreased during seed maturation period. Seed weight (1000 seeds) of MS to pollen parent ratio (4:2) was higher than other treatments. These results suggest that fatty acid compositions and seed weight was affected by ratio of MS line to pollen parent. For rape seed production, a suitable ratio of MS line to pollen parent will be required to cultivate rape plantations.
Effect of Cadmium concentration on plant growth characteristics of Jatropha curcas L.
Yang-Gyu Ku,Won Park,Cho-Rong Kim,Ha-Young Jang,Ha-Na Park,Hyun-Sung Kim,Jeong-Min Oh,Jin-Ki Bang,Young-Seok Jang,Sung-Ju Ahn 한국작물학회 2008 한국작물학회 학술발표대회 논문집 Vol.2008 No.10
Cadmium (Cd) is one of heavy metals that can be easily absorbed by plant roots, and transported from soil to shoots. The effect of Cd concentration (0~200 μM) on the physiological responses, Cd content of shoot and root, and antioxidant enzymes by oil plants Jatropha curcas (cv. Biji Jarak) were investigated in hydroponics system for two weeks. Stomatal conductance was significantly depressed by Cd treated plants. However, the leaf chlorophyll content was unaffected by Cd treated plants. Cd contents in the roots of Jatropha were accumulated higher than those of shoots. Jatropha treated plants at 100 and 200 μM was found to accumulate more than 100 mg kg-1 of Cd in shoots. Jatropha plants had a high ablity to uptake Cd from soil and transport it from soil to shoot as a Cd hyperaccumulator plant because of plants accumulating more than 100 mg kg-1 of Cd in shoots are considered to define as Cd hyperaccumulator. These results confirm that Jatropha is a suitable candidate for the phytoremediation of high-level cadmium contaminated soils.
Yang-Gyu Ku,Won Park,Jin-Ki Bang,Young-Seok Jang,Mi-Chung Suh,Sung-Ju Ahn 한국작물학회 2008 한국작물학회 학술발표대회 논문집 Vol.2008 No.10
Brassica napus L. (Brassicaceae), is one of major oilseed crops commonly cultivated cereal-growing areas after the rice harvest in Asia countries, has recently focused much attention as its seed is the primary source for bio-diesels. In rapeseed growing regions of South Korea, typical double-cropping regions are constantly or periodically received with poorly drained soil condition or encountered dried soil condition during the reproductive stage. This study was conducted on rapeseed plants subjected to both waterlogging and drought conditions for 4 days to investigate responses in physiological characteristics, fatty acid compositions and yield performances at reproductive stage. The treatments were thus as follows: (1) control normally irrigated, (2) waterlogging treatment were flooded by placing their pots inside larger plastic pots filled with tap water with a 2-cm water layer over soil surface, (3) drought treatment was not irrigated. For recovery period, rapeseed plants subjected to waterlogging for 4 days were drained after waterlogging, and irrigated daily as control. Drought treatment after recovery period was irrigated daily as control. Rate of photosynthesis and stomatal conductance of waterlogging and drought treated plants significantly decreased within 4 days. For recovery period, stomatal conductance and photosynthetic rate of the waterlogged and drought treated plants occurred level similar to that of the controls by 2 days after recovery period. Fatty acid compositions of the both waterlogging and drought treated plants did not affect, but yield performances of the waterlogging treatment significantly decreased. These results suggest that both waterlogging and drought conditions for 4 days did not influence fatty acid compositions, but affected yield performance at final harvest.