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Effects of Climatic Factors and Picking Time on Availability of Seeds of Chamaecyparis obtusa
Son, Seog-Gu,Kim, Chan-Soo,Hwang, Seok-In,Jeong, Jin-Heon,Choi, Wan-Yong Korean Society of Forest Science 2008 한국산림과학회지 Vol.97 No.2
Seed production and germination could be influenced by some factors. The picking time and climate factors are regarded as the elements to obtain sound seeds. We have observed the seed productivity and germination of seeds from trees of Chamaecyparis obtusa selected in a clonal seed orchard. Depending on picking time, various shapes from liquid material, something jellied to the fully matured one were observed. Germination aspects varied throughout the test days. After 20days of seeding in a glass petri-dish, germinal apparatuses appeared from the all seeds which had been picked from after at the end of August. The highest germination rate of about 30% was observed from the seeds picked from $20^{th}$ of September and $10^{th}$ of October. Seed production was about two times higher in 2005 than in 2006 and the average germination rate was also higher in 2005. We have also analyzed the effects of climatic factors about two consecutive years on seed productivity. Among the climatic factors, monthly sum of temperature and of precipitation were the main factors for maturation of Chamaecyparis obtusa seeds.
백합나무(Liriodendron tulipifera L.) 체세포배(體細胞胚) 발생에 미치는 모수(母樹) 및 암배양(暗培養) 효과
손석규 ( Seog Gu Son ),문흥규 ( Heung Kyu Moon ),김용욱 ( Yong Wook Kim ),김지아 ( Ji Ah Kim ) 한국산림과학회 2005 한국산림과학회지 Vol.94 No.1
An effective micropropagation system for Liriodendron tulipifera L via somatic embryogenesis was established using immature seeds. Immature seeds from five individual trees were bisected longitudinally and cultured on two basal media (MS and R5) containing different combinations of 2.4-D and TDZ to induce callus and embryogenic tissue under light (40 umol m^(-2)s^(-1), 16 hr/day) or complete darkness at 25±2℃. There was no distinctive difference on callus and embryogenic tissue induction between the two basal media with PGRs. Optimum culture medium appeared to be MS medium supplemented with 1.0 mg/L 2.4-D and 0.01 mg/L TDZ plus 3% sucrose. Nonembryogenic callus induction rate was not significantly different among the genotypes. However, the embryogenic callus induction frequency differed greatly by the genotypes ranging from 55% to 72%, when cultured in the dark. Generally, the cultures maintained in the dark tended to show normal somatic embryo development as well as embryogenic tissue formation and this was confirmed by histological examination. Above results suggest that a proper selection of mother tree and dark culture condition are necessary to optimize somatic embryogenesis system of Liriodendron tulipffera.
종가시나무(Quercus glauca)의 육종집단 조성과 기후인자
손석규 ( Seog Gu Son ),김효정 ( Hyo Jeong Kim ),강영제 ( Young Je Kang ),오찬진 ( Chan Jin Oh ),김찬수 ( Chan Soo Kim ),변광옥 ( Kwang Ok Byun ) 한국농림기상학회 2011 한국농림기상학회지 Vol.13 No.3
A breeding population of Quercus glauca has been established via simple direct selection. Seedlings from naturally crossed seeds of 35 selected families growing in Jeju Island were placed using stroll repeated planting into two experimental forest located at Hannam and Sanghyo in Jeju. After 3 years of planting, characteristics of growth were examined. Growth pattern of trees in Sanghyo was better than those in Hannam. The average heights of filial were 66.8 cm in Hannam and 92.5 cm in Sanghyo. Root collar diameters of filial in Hannam and Sanghyo were 9.3 mm and 12.2 mm, respectively. A great weather differences especially in precipitation and temperature were shown between two test sites. The result of difference of growth pattern between two sites could be useful in provenance adaptability test. Data within families and individuals obtained from this study was also useful for establishment of seed orchard of Q. glauca.
Kyu-Suk Kang,Seog-Gu Son,Mu-Seok Han 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07
Maesopsis eminii, known as ‘umbrella tree’ in English, occurs naturally between 6oS and 8oN in tropical Africa. It is a species of moist forests and an early succession species, adapt at colonizing grasslands and disturbed areas in the high forest. It is widely distributed in forest re-growth and remarkably long lived for a pioneer species, attaining over 150 years. M. eminii was introduced into Java, Indonesia in the 1920s and has been widely cultivated in Java, Sumatra and Kalimantan for timber plantations due to its timber value, fast growing and leave usage for fodder. Annual wood production potential is 30 m3/ha in Africa and 40 m3/ha in Indonesia. The final rotations for timber production are 20-30 years in Africa and 10-20 years in Indonesia, and rotations for fuel wood, poles and pulp production are about 8 years. Genetic resources (plus trees) of M. eminii growing in several populations from west Java were collected, and a progeny test of the 100 open-pollinated families was established in west Java, Indonesia. Early results from a field test of M. eminii are reported from the progeny test trial. Seedling height and diameter at root collar (DRC) were measured at 0, 10 and 15 months of ages. Age 0 means the measurement just before the planting. The averages of seedling height and DRC at age 15 months were 134.4 cm and 1.86 cm. Family survival rates were, on average, 65.6% and 62.8% at age 10 and 15 months, respectively. Family genetic variance and replication variance at age 15 months were higher than those at age 10 months. Seedling height was positively correlated with DRC growth and statistically significant at the same ages. The coefficients of genetic variation for seedling height and DRC were ranged from 0.01 to 12.69 and from 1.97 to 13.70. Heritability estimates obtained were 0.44, 0.04, 0.01, and 0.31, 0.01 and 0.02 for seedling height and DRC at age 0, 10 and 15 months, respectively. Family averages of the 10 best and the 10 poorest families for each trait indicated that there were large differences of seedling height and DRC growth among families and between ages. Genetic gain for DRC was expected to be substantial and higher than that for seedling height growth at age 15 months. Those results suggested that growth improvement through the superior family selection of M. eminii could be possible.
메기( Silurus asotus)용 실험 배합사료와 상품사료의 사육효능 비교
임상구 ( Sang Gu Lim ),김광석 ( Kwang Seog Kim ),강용진 ( Yong Jin Kang ),김응오 ( Eung Oh Kim ),손맹현 ( Maeng Hyun Son ),안철민 ( Cheul Min An ),김강웅 ( Kang Woong Kim ),조용철 ( Yong Chul Cho ),김경덕 ( Kyoung Duck Kim ) 한국수산과학회 2012 한국수산과학회지 Vol.45 No.2
Two feeding trials were conducted to evaluate the effects of experimental extruded pellets (EEPs) and commercial EPs (CEPs) on Far Eastern catfish Silurus asotus in pilot- (experiment I) and commercial-scale (experiment II) tanks. Four diets were prepared: three EEPs (EEP1, EEP2 and EEP3) that contained different amounts of tuna fish meal, soybean meal, and squid liver oil, and one CEP diet. In experiment I, three replicate groups of juveniles were fed one of the four EPs in pilot-scale tanks for 19 weeks. The weight gains (WGs) of fish fed EEP1 and CEP were significantly higher than those of fish fed EEP2 or EEP3. The highest feed efficiency (FE) was observed in fish fed the CEP diet (P<0.05), and the FE of fish fed EEP1 and EEP3 were significantly higher than that with EEP2 (P<0.05). In experiment II, juveniles were fed one of four EPs in commercial-scale tanks for 19 weeks. WG and FE values of fish fed EEP1 and CEP were higher than those of fish fed EEP2 and EEP3. The results of this study indicate that the dietary formulation used in EEP1 could be used as a practical feed for Far Eastern catfish.