• Korean Journal of Breeding Science
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• v.40 no.4
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• pp.435-438
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• 2008

A new spray rose cultivar 'Morning Shine' was bred from the cross between light pink spray cultivar 'Charming' and white spray cultivar 'Princess' at the National Horticulture Research Institute. The cross was made in 2000 and 'Morning Shine' was finally selected in 2006 after investigating characteristics for three years from 2003 to 2006. 'Morning Shine', a light yellow spray cultivar grows vigorously and has high productivity. The major characteristics of this cultivar are $159.7 stems/m^2/year$ in yield, 74.3 cm in length of cut flower, 7.2 cm in flower diameter, 35.6 in petal number, and 13.0 days in vase life. This cultivar can be propagated by both cutting and grafting. The consumer's preference of this cultivar is relatively higher than that of control cultivar, 'Sunny Lady'.

• The Korea Journal of Herbology
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• v.22 no.3
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• pp.1-7
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• 2007

Objectives : This research was observed by examining the external and internal parts and the quantity of the surface components of the wild type and cultivar of Angelica tenuissima in korea. Methods : The slice of the tested material made by paraffin section technique was colored with Safranine Malachite Green contrast methods, and then observed and photographed by the microscope and examined the quantity of the surface components. Results : 1. The cultivar has comparatively many thick roots while the wild type has many radicles, with its root and stem constituting the major part, and the size of its root is small. 2. In case of ferulic acid, the wild type contains 0.066% of it, while the cultivar, 0.031%, The wild type contains 4.258% of z-ligustilide and the cultivar, 1.956%. Conclusions : It was thought that there might be also some differences in their genetic characteristics, etc. On this, however, further in-depth study is needed.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2018.04a
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• pp.52-52
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• 2018

Apple (Malus domestica) is one of the most economically important fruits in Korea. But virus infection has decreased sustainable production of apple and caused the serious problems such as yield loss and poor fruit quality. Virus or viroid infection including Apple chlorotic leaf spot virus (ACLSV), Apple stem pitting virus (ASPV), Apple stem grooving virus (ASGV), Apple mosaic virus (ApMV) and Apple scar skin viroid (ASSVd) has been also reported in Korea, furthermore, its damages and economic losses have increased constantly. In our research, we tried to survey virus infection for commercial nursery trees of major apple cultivars, especially dwarfing rootstocks 'M.9' and 'M.26' as well as scions. Trees were collected from 11 locations which have produced a great amount of apple nursery stocks in Korea. Infection degree was investigated in apple cultivars, 'Hongro' and 'Fuji' using RT-PCR method. In the scion of cultivar 'Hongro', infection ratio of ACLSV, ASPV and ASGV were 100%, 81.8% and 100% respectively. In the rootstock of cultivar 'Hongro', infection ratio of ACLSV, ASPV, ASGV and ApMV were 90.9%, 81.8%, 100% and 9.1% respectively. In the scion of cultivar 'Fuji', infection ratio of ACLSV, ASPV and ASGV were 81.8%, 90.9% and 100% respectively. In the rootstock of cultivar 'Fuji', infection ratio of ACLSV, ASPV, ASGV and ApMV were 81.8%, 90.9%, 100% and 9.1% respectively. Infection of ASSVd was not detected in both cultivars. From our results, it was found that most of apple rootstocks and scions had multiple infections by apple viruses which have caused economic damage in fruit production.

• Research in Plant Disease
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• v.25 no.1
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• pp.43-47
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• 2019

Apple chlorotic leaf spot virus (ACLSV), Apple stem pitting virus (ASPV), Apple stem grooving virus (ASGV), and Apple scar skin viroid (ASSVd) are economically important viruses that infect pear tree species worldwide. To evaluate the prevalence of these viruses in Korea, we investigated infection degree of three viruses and one viroid for the commercial nursery trees of the pear cultivars, Niitaka, Chuwhang, Wonwhang, and Whasan in 2017 and 2018. The results showed that the infection ratio of ACLSV, ASPV, ASGV, and ASSVd for the scion of pear cultivar Niitaka was 10%, 45%, 77%, and 50%, respectively. From the scion of pear cultivar Chuwhang, infection ratios of ASPV, ASGV, and ASSVd were found to be 70%, 50%, and 60%, respectively. From the scion of pear cultivar Whasan, infection ratios of ACLSV, ASPV, ASGV and ASSVd were found to be 40%, 60%, 93%, and 20%, respectively. From the root stock of pear cultivar Wonwhang, infection ratios of ACLSV, ASPV, ASGV, and ASSVd showed 28%, 57%, 100%, and 14%, respectively. ASGV had the highest recorded infection rate, and ACLSV was characterized by the lowest infection rate. The mixed infection ratio of Niitaka, Chuwhang, Whasan, and Wonwhang was 45%, 60%, 70%, and 85%, respectively.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.65 no.4
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• pp.339-345
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• 2020

Recently, abnormal weather conditions, such as extreme high temperatures and droughts, have increased in frequency due to climate change, there has accordingly been growing concern regarding the detrimental effects on field crop, including soybean. Therefore, this study was conducted to examine the effects of increased temperatures on soybean growth and yield using a temperature gradient chamber (TGC). Two major types of soybean cultivar, a medium- seed cultivar such as Daepung-2 and a large-seed cultivar such as Daechan, were used and four temperature treatments, aT+1℃ (ambient temperature+1℃), aT+2℃ (ambient temperature+2℃), aT+3℃ (ambient temperature+3℃) and aT+4℃ (ambient temperature+4℃) were established to examine the growth response and seed yield of each cultivar. Seed yield showed a higher correlation with seed weight (r=0.713***) and an increase in temperature affected seed yield by reducing the single seed weight. In particular, the seed growth rate of the large-seed cultivar (Daechan) increased at high temperature, resulting in a reduction in the number of days for full maturity. Our results accordingly indicate that large-seed cultivar, such as Daechan, is potentially vulnerable to high temperature stress. The results of this study can be used as basic data in the development of cultivation technology to reduce the damage caused by elevated temperatures. Also, further research is required to evaluate the response of each process contributing to seed yield production under high temperatures.

• Proceedings of the Botanical Society of Korea Conference
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• 1995.07a
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• pp.133-170
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• 1995

The major objectives of fruit breeding lie in improvement of cultivar, easy to be cultivated and of high quality, in order to produce unexpensive, delicious fruit both for fresh fruit market and processing. Recently, fruit breeding in Korea has contributed to breeding of several superior cultivars in major fruit crops, resulting in appreciable improvement in qualities such as skin color, taste and fruit-bearing habit concerned with productivity. In spite of accomplishments mentioned above, the need for both highly disease-resistant cultivars and long-keeping, physiological disorder-resistant cultivars to meet long distance transsportation in the temperate fruit crops of apples, oriental pears, stone fruits such as peaches, and grapes grown in Korea is rapidly pressing more than ever, as cultivars of today susceptible to pests and diseases and vulnerable to physiological disorders are very expensive and time-consuming in post-harvest handling and management. Thus, imporvements made in the above problems through breeding level will lead to the really enhanced productivity in fruit industry. The major impediments of tree size, the long length of juvenile period and the highly heterogeneous genetic composition to the improvement of fruit crops are responsible for the lower amount and rate of improvements of fruit crops as compared to annuals. Considering the expected limitations of the above problems to be solved through conventional breeding methods and strategy, a turning point of breeding a near perfect cultivar would be laid down if innovative breakthroughs in biological technology will be realized in applying some of the techniques of genetic manipulation at the molecular level to the cultivar improvement of fruit crops, such as the selective insertion of DNA carrying genes that govern desirable characteristics. More than anything else, those traits such as fruiting habit deciding productivity, elements of fruit qualities conditioned by monogene, and disease-and pest-resistance of vital importance for successful fruit growing are urgently desired to be improved by advancement of biotechnology for they are more than difficult and need long period to be attained through conventional breeding method.

• Korean Journal of Breeding Science
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• v.41 no.4
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• pp.616-619
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• 2009

A new standard rose cultivar "Red Charm" was bred from the cross between deep red standard cultivar "First Red" and light red standard cultivar "Cardinal" at the Jeollanamdo Agricultural Research and Extention Services (JARES). The cross was made in 2003 and, "Red Charm" was finally selected in 2008 after investigating characteristics for three times from 2007 to 2008. "Red Charm", a red standard cultivar has good flower shape and velvet flower color. The major characteristics of this cultivar are on average $119.3stems/m^2/year$ in yield, 69.5 cm in length of cut flower, 10.3 cm in flower diameter, 36.9 in petal number, and 9.8 days in vase life. This cultivar can be propagated by both cutting and grafting. The consumer's preference of this cultivar, "Red Charm" is relatively higher than that of control cultivar, "Red Velvet".

• Korean Journal of Breeding Science
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• v.43 no.6
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• pp.528-531
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• 2011

A new spray rose cultivar 'Cherry Tea' was bred from a cross between pink spray cultivar 'Pinocchio' and yellow spray cultivar 'Flair' at the National Institute of Horticultural Research Institute. The cross was made in 2003 and 'Cherry Tea' was finally selected in 2008 after evaluating characteristics for three years from 2006 to 2008. 'Cherry Tea', a light orange spray cultivar grows vigorously and has good vase life. The major characteristics of this cultivar are $137stems/m^2/year$ in yield, 68.8 cm in length of cut flower, 5.5 cm in flower diameter, 34.0 in petal number, and 12.4 days in vase life. This cultivar can be propagated by both cutting and grafting. The consumer's preference of this cultivar is relatively higher than that of control cultivar, 'Little Marble'.

• FLOWER RESEARCH JOURNAL
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• v.19 no.4
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• pp.251-254
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• 2011

A new standard white-pink flower rose cultivar 'Innocence' was bred from the cross between white standard cultivar 'Juvena' and green-white standard cultivar 'Green Success' at the Jeollanamdo Agricultural Research and Extension Services (JARES). The cross was made in 2001 and, 'Innocence' was finally selected in 2006 after investigating characteristics for three times from 2004 to 2006. 'Innocence' a white-pink standard cultivar has good flower shape with few prickles. The major characteristics of this cultivar were $118.7stems{\cdot}m^{-2}$ in year yield, 68.0 cm in length of cut flower, 10.9 cm in flower diameter, 34.4 in petal number, and 10.7 days in vase life. This cultivar can be propagated by both cutting and grafting. The consumer's preference of this cultivar was relatively higher than that of control cultivar, 'Rose Yumi'.

• Korean Journal of Breeding Science
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• v.41 no.3
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• pp.284-287
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• 2009

A new spray rose cultivar "Morning Star" was bred from the cross between orange spray cultivar 'Macarena' and yellow spray cultivar 'Lion Sunshine' at the National Institute of Horticultural Research Institute. The cross was made in 2002 and "Morning Star" was finally selected in 2007 after investigating characteristics for three years from 2005 to 2007. "Morning Star", a orange spray cultivar grows vigorously and has good flower shape. The major characteristics of this cultivar are 170.2 stems/$m^2$/year in yield, 57.4cm in length of cut flower, 5.5cm in flower diameter, 48.5 in petal number, and 11.4 days in vase life. This cultivar can be propagated by both cutting and grafting. The consumer's preference of this cultivar is relatively higher than that of control cultivar, 'Sunny Lady'.