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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,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.