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Ho-Jin Seo,Young-Ook Jin,Chin-Lung Lee,Su-Feng Roan,Iou-Zen Chen 한국원예학회 2015 원예과학기술지 Vol.33 No.1
Time-specific responses of flower bud differentiation were investigated in ‘Shinko’ (Pyrus pyrifolia Nakai) pear grown at different altitudes from July through December 2013 to determine their suitability as scions in a top-grafting system. Flower bud initiation and bud necrosis were monitored on each of three sections of one-year-old shoots: terminal, middle, and basal. Flower bud differentiation s tarted in September in the highlands of the Lishan area, and in J uly in the lowlands of the Zhoulan area. In Lishan, flower bud differentiation was higher in the middle and basal segments; during leaf fall, however, flower bud differentiation occurred rapidly in the terminal segment. In Zhoulan, flower buds began to differentiate from the terminal section of the shoot, and severe flower bud necrosis was noted. In July, flower buds developed normally; however, in early August, some of the buds at the basal segment showed browning. During leaf fall, some flower buds showed symptoms of necrosis with rapid and complete browning. Flower bud necrosis began at the basal segment and progressed rapidly towards middle and terminal sections. Before leaf fall, flower buds fell off when scales swelled. The terminal and middle parts of the current-year shoots, with some flower buds, collected in October or later from the Lishan area could be used as scions for top-grafting of ‘Shinko’ pear. Each grafting scion was a 3-5 cm shoot with one flower bud. These results suggest that scions from the terminal and middle segments of stems of ‘Shinko’ pear from the Lishan area can be used as scions whereas those from Zhoulan area show necrosis and might not be suitable as scions.
Seo, Ho-Jin,Jin, Young-Ook,Lee, Chin-Lung,Roan, Su-Feng,Chen, Iou-Zen Korean Society of Horticultural Science 2015 원예과학기술지 Vol.33 No.1
Time-specific responses of flower bud differentiation were investigated in 'Shinko' (Pyrus pyrifolia Nakai) pear grown at different altitudes from July through December 2013 to determine their suitability as scions in a top-grafting system. Flower bud initiation and bud necrosis were monitored on each of three sections of one-year-old shoots: terminal, middle, and basal. Flower bud differentiation s tarted in September in the highlands of the Lishan area, and in J uly in the lowlands of the Zhoulan area. In Lishan, flower bud differentiation was higher in the middle and basal segments; during leaf fall, however, flower bud differentiation occurred rapidly in the terminal segment. In Zhoulan, flower buds began to differentiate from the terminal section of the shoot, and severe flower bud necrosis was noted. In July, flower buds developed normally; however, in early August, some of the buds at the basal segment showed browning. During leaf fall, some flower buds showed symptoms of necrosis with rapid and complete browning. Flower bud necrosis began at the basal segment and progressed rapidly towards middle and terminal sections. Before leaf fall, flower buds fell off when scales swelled. The terminal and middle parts of the current-year shoots, with some flower buds, collected in October or later from the Lishan area could be used as scions for top-grafting of 'Shinko' pear. Each grafting scion was a 3-5 cm shoot with one flower bud. These results suggest that scions from the terminal and middle segments of stems of 'Shinko' pear from the Lishan area can be used as scions whereas those from Zhoulan area show necrosis and might not be suitable as scions.
Ho-Jin Seo,Po-An Chen,Shu-Yen Lin,Jin-Ho Choi,Wol-Soo Kim,Tzu-Bin Haung,Su-Feng Roan,Iou-Zen Chen 한국원예학회 2015 원예과학기술지 Vol.33 No.4
‘Taichung No. 2’ is a new Asian pear cultivar developed in Taiwan with low chilling requirement; however, is likely to develop internal browning disorder under low temperature storage conditions. We investigated the impact of storage time on f lesh b rowning d isorder in p ears harvested f rom 22 orchards in 2 010 a nd 2 011, and analy zed the levels o f nutrients in different fruit parts such as the peel, flesh, and core. Calcium and potassium contents were higher in the flesh and peel, respectively, of more severely browned fruits, whereas a lower magnesium content was recorded in the peel and core of these fruits. Nitrogen and potassium contents in the peel, and calcium content in the flesh were positively correlated with browning disorder severity. By contrast, the magnesium content in the core was negatively correlated with browning disorder severity. However, the nutrient contents in fruits varied between the two sampling years considered. Only the K/Mg ratio was an effective predictor of the browning disorder severity and showed a positive linear correlation in the two years. We recommend that the K/Mg ratio should be lower than 10 to avoid severe browning disorder in pears.
Current Status and Prospects of Small Fruit Production in Taiwan
Ho-Jin Seo,Sang-Jin Yang,Jang Hoon Song,Kyeong Bok Ma,Iou-Zen Chen,Su-Feng Roan 한국국제농업개발학회 2020 韓國國際農業開發學會誌 Vol.32 No.1
대만의 소과류 작물의 생산량은 적지만 생산 시스템은 매우 발달이 되어있다. 2017년 기준 대만 내 소과류 전체 재배면적은 2826.6 ha로 이 중 포도(500.33 ha)와, 딸기(67.56 ha)가 가장 많이 재배되고 있다. 다음으로는 오디나무 (Morus alba L.), 베이베리 (Myrica rubra Sieb. et Zucc.), 인도 구스베리(Phyllanthus emblica L.) 순으로 재배가 많이 되고 있다. 현재 대만은 새로운 품종 육성과 재배 시스템 개발을 위해 많은 노력을 기울이고 있는데 최근 블루베리를 대상으로 대만 기후에 적합한 저온요구도가 낮은 품종을 육종 중에 있으며 또한 포도와 딸기는 연중 생산이 가능한 재배법이 개발이 되어 농가에 보급되었다. 대만은 40년 이상 생과 위주의 포도 품종으로 생산을 하였으나, 최근에는 와인용 포도 품종 등을 육종 연구가 지속적으로 이루어지고 있다. Although Taiwan produces small fruits on a small scale, it is famous for its production techniques and systems. Only two types of small fruits are economically produced in Taiwan: the grape and strawberry. Four other types (the mulberry Morus alba L., the bayberry Myrica rubra Sieb. et Zucc., the Indian gooseberry Phyllanthus emblica L., and the kiwifruit or Chinese gooseberry Actinidia chinensis Planch. var. setosa and A. deliciosa Ferg.) have production areas of less than 100 ha. Taiwan has been developing production techniques for fruits such as the blueberry. In 2017, Taiwan had production areas of 2,828.6 ha for grapes, 500.33 ha for strawberries, 67.56 ha for mulberries, 31.17 ha for bayberries, and 14.19 ha for kiwifruit. The development of new small fruit crops demands new culture methods and strategies. It is important to breed or select new small fruits from the native germplasm when introducing new foreign varieties. Some special conditions, such as breeding the blueberry plant with a short chilling requirement, are needed. Further, new culture systems such as year-round production for grape, mulberry, and strawberry have been tried. Although Taiwan has cultivated grapes for wine production for over 40 years, new grape cultivar breeding programs for wine production have been introduced.
Seo, Ho-Jin,Chen, Po-An,Lin, Shu-Yen,Choi, Jin-Ho,Kim, Wol-Soo,Haung, Tzu-Bin,Roan, Su-Feng,Chen, Iou-Zen Korean Society of Horticultural Science 2015 원예과학기술지 Vol.33 No.4
'Taichung No. 2' is a new Asian pear cultivar developed in Taiwan with low chilling requirement; however, is likely to develop internal browning disorder under low temperature storage conditions. We investigated the impact of storage time on flesh browning disorder in pears harvested from 22 orchards in 2010 and 2011, and analyzed the levels of nutrients in different fruit parts such as the peel, flesh, and core. Calcium and potassium contents were higher in the flesh and peel, respectively, of more severely browned fruits, whereas a lower magnesium content was recorded in the peel and core of these fruits. Nitrogen and potassium contents in the peel, and calcium content in the flesh were positively correlated with browning disorder severity. By contrast, the magnesium content in the core was negatively correlated with browning disorder severity. However, the nutrient contents in fruits varied between the two sampling years considered. Only the K/Mg ratio was an effective predictor of the browning disorder severity and showed a positive linear correlation in the two years. We recommend that the K/Mg ratio should be lower than 10 to avoid severe browning disorder in pears.