In recent years, the temperature of Korea has been rapidly increasing due to global warming. Over the past 40 years, the temperature of Korea has risen by about 1.26℃ compared to that in the early 1980s. By region, the west region of the Gangwon Province was the highest at 1.76℃ and the Jeonnam Province was the lowest at 0.96℃. As the temperature continues to rise, it is expected that the rice yield will decrease in the future using the current standard cultivation method. As a result of global warming, the periods in which rice cultivation could be possible in regions each year has increased compared those to the past, showing a wide variety from 110 days in Taebaek to 180 days in Busan and Gwangyang. In addition, the transplanting time was delayed by 3-5 days in all regions. The average annual yield of rice showed an increasing trend when we analyzed the average productivities of developed varieties for cooked rice since the 1980s, especially in the early 1990s, which showed a rapid increase in productivity. The relationship between the average temperature at the time of development and the rice yield was divided into the periods before and after 1996. The higher the average temperature, the lower the yield of the developed varieties until 1996. However, since 1996, the increase in the average temperature did not show a trend in the productivity of the developed varieties. The climate change adaptability of developed rice varieties was investigated by analyzing the results of growing crops nationwide from 1999 to 2016 and the change in the annual yields of developed varieties and recently developed varieties as basic data to investigate the growth status of the crops in the country. As a result of annual comparisons of the yields of Taebongbyeo (2000) and Ungwangbyeo (2004) developed in the early 2000s for Odaebyeo, which was developed in the 1980s, the annual yields were relatively higher in varieties in the 2000s despite the increase in temperature. The annual yields of Samgwangbyeo (2003) and Saenuribyeo (2007), which were recently developed as mid-late-type varieties, were higher than those of an earlier developed variety called Chucheongbyeo, which was developed in the 1970s. Despite the rapid increase in temperature, rice cultivation technology and variety development are well adapted to climate change. However, since the biological potential of rice could reach its limit, it is necessary to develop continuous response technology.
We investigated the basic vegetative phase (BVP), photoperiod-sensitivity (PS), and thermo-sensitivity (TS) of 40 rice varieties to characterize their heading ecology that is adaptable to North Korean rice production areas. The ranges were 12 - 43 days for BVP, 0 - 74 days for PS, and 15 - 33 days for TS, depending on the variety. The number of days from transplanting to the heading stage (DTH) was significantly correlated with PS in the 13 major rice production regions where all 40 varieties (including early-, middle-, and mid-late-maturing varieties) were tested. DTH was significantly correlated with BVP and TS but not with PS in the 10 low-temperature regions where only 28 early-maturing varieties were tested. The heading ecology of the adaptable varieties for each region could be characterized by an exponential equation between the BVP and PS of varieties that headed at the border of the safe marginal heading date (SMHD) for each of the seven regional environments (Kaesong, Haeju, Yongyon, Singye, Sariwon, Nampo, and Pyongyang). A PS of 25 - 30 days or less was an additional adaptive trait in the Sariwon and Pyongyang environments. The varieties that reached the heading stage not later than the SMHD in six regional environments (Anju, Kusong, Sinuiju, Changjon, Wonsan, and Supung) and those that reached the heading stage not later than the late marginal heading date (LMHD) in four regional environments (Hamhung, Pyonggang, Huichon, and Kanggye) had both a PS of 26 days or less and a BVP of 25 - 28 days or less. In the Yangdok, Sinpo, and Chunggang environments, varieties that reached the heading stage not later than the LMHD for each region had a BVP of 15 - 20 days or less. The results suggested that a shortened BVP trait should be introduced to existing early-maturing rice varieties to reduce the duration of growth period to reach the heading stage.
Oh, Sung Hwan;Choi, Kyung-Jin;Kim, Sang Yeol;Seo, Woo Duck;Han, Sang Ik;Cho, Jun Hyun;Song, You Chun;Nam, Min Hee;Lee, Chung Keun;Woo, Sunhee;Lee, Chulwon
KOREAN JOURNAL OF CROP SCIENCE
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v.60
no.2
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pp.153-166
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2015
Production of high quality pigmented rice contained with high content of anthocyanin, and polyphenol was significantly influenced by cultivation environments like transplanting date and cultivation location. This study was carried out to establish an optimum transplanting date and cultivation region to produce maximum content of anthocyanin, polyphenol and antioxidant activity of pigmented rice varieties (black, red colored). Three transplanting times (May 20, June 5, June 20) and four different sites (Miryang, Uiseong, Sangju, Bonghwa) were evaluated with five pigmented rice cultivars. Anthocyanin and total polyphenol index to average temperature during 30 days after heading (DAH) of black, red pigmented rice varieties showed that anthocyanin and total polyphenol contents were decreased by 10% and 9%, respectively, with increasing average temperature of $1^{\circ}C$. The optimum ripening temperature of the 30 DAH for the production of high anthocyanin and total polyphenol was 22 to $23^{\circ}C$ for early maturity black rice, 21 to $22^{\circ}C$ for mid-late maturity of black and red rices, respectively. On the other hand, an estimated heading date of pigmented rices in return according to the optimum ripening temperature of the 30 DAH was ranged Aug. 11 to 17 for early maturity black rice, Aug. 25 for mid-late maturity black, red rice variety in Jecheon, Aug. 27 to Sep. 2 for early maturity type, Sep. 3 to 6 for mid-late type in Daegu. It seemed that Jecheon, Boeun, Mungyeong, and Yeongju were optimum regions for cultivation of pigmented rices. The estimated sowing date of pigmented rices for high anthocyanin and total polyphenol production based on the optimum heading date was May 18 to 26 for early maturity black rice variety, April 11 for mid-late black, red variety in Jecheon, May 23 to 28 for early type, April 9 to 26 for mid-late type in Boeun, respectively.
This article focuses on changes in the ginseng industry in the 1930s in areas other than the Government Contract Cultivation (GCC) zones. A major characteristic of the ginseng industry in the 1930s was the rapid increase in the area covered by ginseng gardens: the area was about 212 ha in 1929 and 252 ha in 1930 and 1931 but soared to around 441 ha in 1938. This occurred because the non-GCC areas increased significantly during this period. Until the early 1930s, the ratio of GCC to non-GCC areas was 70:30. By the late 1930s, however, the ratio had changed to 53:47. The reason for this change was that the area of the newly established ginseng gardens in the GCC zones had decreased, while that of the non-GCC ginseng gardens had steadily increased. Due to the Japanese invasion of China, China boycotted red ginseng, and exports were sluggish, so the GCC areas were reduced. On the other hand, the non-GCC ginseng gardens were not affected, and the area they covered steadily increased. As a result, in the 1930s, the ginseng industry outside of the GCC areas grew rapidly. The region that led the growth of the ginseng industry outside of the GCC zone was Jeonbuk. By the late 1930s, Jeonbuk dominated the other provinces and accounted for more than 50% of the non-GCC farming zone. Gyeongbuk and Gangwon-do followed Jeonbuk in terms of ginseng cultivation areas. While Gyeonggi-do, Gyeongnam, and Chungbuk were also active in ginseng cultivation, Jeonnam and Chungnam were not active. In the 1930s, the growth of the ginseng industry outside of the GCC zones was driven by the efforts of ginseng farmers and the support of local governments. An examination of Yecheon-gun in Gyeongbuk, Ganghwa-gun in Gyeonggi, and Jecheon-gun in Chungcheongbuk-do showed that ginseng farmers organized cooperatives as the ginseng industry steadily developed in these regions, and these cooperatives worked systematically to cultivate and sell ginseng. In the case of Ganghwa-gun, activities were carried out to incorporate the GCC zone. The Deoksan Ginseng Association in Jecheon-gun determined that financing for cultivation was key and requested subsidies from the provincial government. Administrative authorities also supported the activities of the ginseng farmers. The activities of the farmers and the support of the administrative authorities together led to the growth of the ginseng industry during this period.
Kim, Young-Ho;Park, Soo-Cheol;Jhune, Chang-Sung;You, Chang-Hyun;Sung, Jae-Mo;Kong, Won-Sik
Journal of Mushroom
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v.10
no.3
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pp.120-128
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2012
Recently sawdust cultivation of Shiitake mushroom (Lentinula edodes) is increasing. It is important to make mycelia to be brown on the substrate surface. This browned surface in sawdust cultivation plays an important role like as artificial bark of the oak log, which protects the other pests and suppresses water evaporation in the substrate. In order to isolate genes which related to brown color formation, differential display method was used. Two cDNA fragments obtained by DD-PCR were 1.2 and 1.6kb and these were expressed in white colored mycelia from L. edodes, but not brown colored mycelia. Partial sequencing of these cDNA fragments showed that the 1.6kb cDNA had 100% identity with the microsatellites gene from Dugenia polichroa. However, the other 1.2kb cDNA fragment had poly T tail on 3' region of partial open reading frame on 5' region. The new primer designed based on the sequence of 1.2kb cDNA was constructed. RT-PCR analysis using the newly designed 0.12kb cDNA specific primer showed that the gene was only expressed in white color mycelia, but not in brown color mycelia. Sequence analysis of 5' region of this 1.2kb cDNA revealed that this gene contained partial open reading frame consisted of 110 amino acid. Homology search using DNASIS database showed that this gene had high sequence homology of 66.7% in DNA level and 69.2 % in amino acid level with dTDP-glucose 4,6-dehydratases gene from Arabidopsis thaliata. The dTDP-glucose 4,6-dehydratases gene was known to be function to have tolerance with oxidation stress. These results strongly suggest that this gene isolated from white mycelia of L. edodes might have a function of repressor against mycelia browning. Therefore I designated this gene as BCR (Brown Color Repressor) gene.
Kim, Young Sang;Kim, Ki Hyeon;Yun, Cheol Gu;Heo, Yun Seon;Kim, Ik Jei;Kim, Young-Ho;Song, Yong-Sup;Lee, Myoung Hee
KOREAN JOURNAL OF CROP SCIENCE
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v.66
no.2
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pp.138-145
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2021
Perilla contains more than 60% of fatty acids. Linolenic acid is effective in preventing heart disease, improving learning ability, treating allergies, and preventing cancer. This study was carried out to improve the cultivation method to aid the stable production of perilla by developing a suitable inter-cropping system with sesame in the central region as well as to report a suitable planting time. The test results are summarized as follows. As the planting time of perilla in the inter-cropping system with sesame was delayed, the number of clusters and capsules decreased. The perilla yields in this system showed significant differences compared to that with the previous crops (sesame varieties) and planting period. The yield of perilla was significantly lower in the characteristic-Type B variety than in the characteristic-Type A variety and decreased significantly as the planting time was delayed. With regards to the quality characteristics of perilla, such as crude protein, crude fat, etc., there were no differences between previous perilla crops and those inter-cropped with sesame. The perilla composition did not show any difference during the planting period; however, with delay in the planting time, crude protein content increased but crude fat content decreased. Yield of perilla was 38% higher in a two-row (40 x 40 cm) system, compared to a single-row cultivation (110 x 20 cm) of perilla inter-cropped with sesame. These results suggest that the suitable method for inter-cropping perilla with sesame in the central region is to sow the characteristic-Type A variety in early May, and cultivate the perilla in two lines (40 x 40 cm) in mid-June. This was judged to be the best cultivation method in the central region.
Journal of the Economic Geographical Society of Korea
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v.13
no.2
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pp.270-295
/
2010
This thesis is to examine natural environments and the change of socio-economic conditions in the clan villages of Kyongbuk region through the case study of Sanggok and Suchon one. The results of the study is summarized in the followings. Firstly, after the early 1990s Sanggok clan village located in Dasan-myeon was not influenced by its natural environmets, but by the relative location near a large city, Taegu. On the contrary, after the 1980s Suchon clan village in Byeokjin-myeon has been grown as an agricultural area of commercially producing water melon due to mountain and its related climate. Secondly, the total population of Sanggok and Suchon clan village have been continuously declined after the 1970s. Particularly the numbers of children per household were declined to 2.4 in the late 2000s. Consequently it is suspected whether or not the clan villages will be existed in spite of their declining population in the future. Thirdly, people in the Sanggok and Suchon clan village were generally poor due to the small agricultural land. After the 1970s, however, the villages have been largely influenced by the industrialization and urbanization of Korea. Sanggok clan village was influenced by the outside expansion of Taegu metropolitan city due to its relative location while Suchon village by the commercial cultivation of water melon under a good condition of natural environments. Fourthly, there are differences between people's cognition to the agricultural conditions of the Sanggok and Suchon clan village. Such a difference is closely related to the socio-economic conditions of the two different clan villages.
Korean Journal of Agricultural and Forest Meteorology
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v.18
no.3
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pp.162-169
/
2016
The agrometeorological reference index means 'the agrometeorological damage possibility' or the possibility of the normal year climate condition to damage the crop cultivation in a certain region. It is a reference used to compare the cultivation risk of a crop by region. The global climate warming is expected to increase the winter temperature. At the same time, the frequency of extreme weather events will also increase. Therefore, people pay attention to the potential of low temperature-induced damages (e.g., frost damage and injury) to fruit trees under the future climate condition. However, simple damage projection based on climate conditions does not help the climate change adaptation in the practical aspect because the climate change affects the phenology of fruit trees as well. This study predicted the phenology of the pear, peach, and apple trees by using the climate change scenarios of major regions. Furthermore, low temperature induced agrometeorological reference indices were calculated based on the effects of temperature on each plant growth stage to predict the damage possibility. It was predicted that the breaking rest would delay more in the future while the bud-burst date and flowering date will be earlier. In Daegu, Jeonju, and Mokpo, the breaking rest delayed more as time passed. The bud-burst date and flowering date of Seoul and Incheon regions were later than other regions. Seoul and Incheon showed a similar pattern, while Daegu and Jeonju revealed a similar pattern. Busan and Mokpo also showed a similar pattern. All regions were safe from the frost damage during the dormancy period. However, plants were vulnerable to frost damage between the breaking rest and the bud-burst period. Regions showed different frost damage patterns between the bud-burst period and the flowering period. During the bud-burst and flowering period, the risk level decreased in general, although the risk of some areas tended to increase.
Park, Kyu-Rim;Kim, Young-Wan;Kim, Tae-Hoon;Ahn, Hee-Young;Sim, So-Yeon;Kim, Jung-Wook;Cho, Young-Su
Journal of Life Science
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v.27
no.8
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pp.919-929
/
2017
This study investigated the biological activities and chemical characteristics of Monascus-fermented Angelica gigas Nakai (A. gigas) with a view to the development of health foods. We also investigated the effect of the cultivation region of three A. gigas cultivars, namely Sancheong, Pyeongchang, and Jecheon. After fermentation, the content of decursin and decursinol angelate was increased compared to non-fermentation; the highest content of decursin and decursinol angelate was found in non-fermentation Pyeongchang A. gigas (PA) at 615.504, 326.742 ppm and fermented Pyeongchang A. gigas (FPA) at 792.610, 429.500 ppm, respectively. The highest content of phenolic compounds, flavonoids, and minerals was found in the FPA group, in which DPPH (${\alpha},{\alpha}^{\prime}-diphenyl-{\beta}-picrylhydrazyl$) radical scavenging activity and Fe/Cu reducing power were stronger in fermented than in non-fermented A. gigas. The FPA group in particular showed the highest activity. We measured nitric oxide (NO) production from lipopolysaccharide-induced RAW 264.7 cells and the inhibition of cancer cell proliferation. The inhibition of activity of NO production and cancer cell (MCF-7 and Hep3B) viability was significantly decreased in the FPA group. The results suggest that FPA may be highly useful as a health food. Overall, the study provides basic data for understanding the biological activities and chemical characteristics of A. gigas fermented by Monascus purpureus for the development of health foods.
Journal of Korean Society of Environmental Engineers
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v.30
no.11
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pp.1154-1160
/
2008
Changes of zinc speciation and dehydrogenase activity in soil were studied before and after a field scale phytoextraction by Fagopyrum esculentum at a paddy soil near a closed zinc mine. The concentrations of zinc in paddy soil, in which Fagopyrum esculentum was planted, ranged from approximately 600 mg/Kg(high Zn soil) to 300 mg/Kg(moderate Zn soil). Despite of severe growth inhibition by Zn at the high Zn region, Fagopyrum esculentum accumulated phytoavailable fraction of Zn absorbed from the soil, and enhanced soil dehydrogenase activity (DHA) that had been inhibited by Zn toxicity. After the plant cultivation of 2 months, the concentrations of phytoavailable Zn in the rhizosphere soil at high and moderate Zn region has decreased 25% and 75%, respectively. The amount of Zn reduction in the rhizosphere soil corresponds to that accumulated in plants (recovery 92$\sim$107%), which implies Fagopyrum esculentum removed Zn from the soil. DHA was inversely correlated to the total Zn concentrations in soil. Before plant cultivation, the DHA in the high Zn soil was twice lower than that in the moderate Zn soil. More than 35% of DHA increase was observed in both soils after the application of phytoextraction with Fagopyrum esculentum.
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