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A New Oriental Squash (Cucurbita moschata) Cultivar, "Chensu" Resistant to Powdery Mildew
Myeong Cheoul Cho,Yoon Chan Heo,Jeong Su Kim,Young Hyun Om,Il Gin Mok,Kue Hyon Hong,Hyo Guen Park 한국육종학회 2004 한국육종학회지 Vol.36 No.2
“Chensu”, a new oriental squash variety was developed by the National Horticultural Research Institute. An interspecific hybridization was made between “Jecheonjaeae,” the local variety of C. moschata and C. martinezii resistant to powdery mildew in 1991.
A New Oriental Squash (Cucurbita moschata) Cultivar, "Mansu" Resistant to Powdery Mildew
Myeong Cheoul Cho,Yoon Chan Heo,Jeong Su Kim,Young Hyun Om,Il Gin Mok,Kue Hyon Hong,Hyo Guen Park 한국육종학회 2004 한국육종학회지 Vol.36 No.2
“Mansu”, a new oriental squash variety was developed by the National Horticultural Research Institute. An interspecific hybridization was made between “Jecheonjaerae”, the local variety of Cucurbita moschata and C. martinezii resistant to powdery mildew i
Myeong Cheoul Cho,Rajametov Sherzod,Hyo Bong Jeong,Eun Young Yang,Kwanuk Lee,Chun Woo Nam,Doo Jong Ha,Dan Hye Kim,Hyoung Je Yoo 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
The objective of this study was to evaluate effect of the grafting. We used ‘Spider’ (Takii seed, Japan) rootstock and big size (Pink type) tomato cultivars ‘Pink Star’, ‘K-Star’ and ‘Dotaerang’ at the four season house in South Korea. Bacterial wilt (caused by Ralstonia solanacearum) and Fusarium wilt (Fusarium oxysporum) diseases tolerant rootstock “Spider” was used. All tomato cultivars seedlings were transplanted with distance 25 cm of plants, in 4 March of 2021 to greenhouse, where day and night temperatures were maintained at 18/32°C, and relatively humidity was within D/N 40 ‒ 90%. Tomato seedlings grafted (GF) and non-grafted (control, CT) were planted on substrate perlite (mixture of perlite no.1 and no.3), fertilization - EC 3.0ds/m, pH 6.0, 6 to12 times per day, cooling system- Forced ventilation (open above 25°C), cooling through fog system (on above 28°C). Drip irrigation systems are used (200 ‒ 250 mL per plant in each time). Plant height (PH), leaf length and width (LL and LW), days to flowering (DF), fruit weight (FW) and yield (FY) parameters were measured. Effect of rootstock on vegetative and reproductive parameters of tomato was differed among cultivars. So, grafted plant significantly decreased growth rate among plants of cv. ‘K-Star’ for all growth period, and the same pattern were observed in cv. ‘Dotaerang’ and ‘Pink Star’ but it persists until 60 DAT (days after transplanting), respectively. Evaluation of influence of grafting on days to flowering among cultivars showed that there no identified significant difference starting of the flowering between GF and CT treatments for all growth period. Almost the same pattern was observed in study of LL and LF among all cultivars, where with aging of plants were identified decreasing of the LL and LF parameters regardless of cultivars and treatments. As mentioned above, with aging of plants were identified significantly decreasing of FW among all cultivars regardless of the treatments, but there was persist the difference in values among cultivars and treatments. And, among all cultivars no found significant difference in FW between GF and CT plants. The significant high yield per plant among cultivars were harvested from GF plants of cv. ‘Pin Star’, however there no found significant difference between GF and CT plants inside of each cultivar. It means GF no significantly affect on FW and FY parameters among studied pink type tomato cultivars.
Recent Activities on Breeding Anthracnose Resistant Pepper at AVRDC- The World Vegetable Center
Myeong-Cheoul Cho,Patcharaporn Suwor,Shin-Wen Lin,Zong-Ming Sheu,Jaw-Fen Wang,Suchila Techawongstien,Roland Schafleitner,Paul Gniffke,Sanjeet Kumar 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07
Pre- and postharvest anthracnose fruit rot is a serious disease of hot peppers (Capsicum annuum) throughout the world. AVRDC has pursued breeding for resistance to anthracnose for more than 10 years and has distributed a number of resistant lines in Asia and Africa. Recently AVRDC has identified highly aggressive isolates of Colletotrichum acutatum that have prompted renewed efforts to identify new anthracnose resistance genes. This study aimed to characterize resistance to specific pathogen strains in an array of newly identified breeding lines, and to validate one simple sequence repeat (SSR) and two sequence characterized amplified region (SCAR) markers linked to the anthracnose resistance locus. Forty-four accessions and two populations (two resistant parents and one susceptible parent, to F1, four backcross populations, and two F2 populations) are currently (Spring 2012) being screened against two pathotypes of C. acutatum collected in Taiwan. Pepper entries include C. annuum, C. baccatum, C. chinense, and their inter-specific progenies. Screening methods include field screening, spray and microinjection assays on green and red-ripe fruits, and molecular assays using SSR and SCAR markers linked to anthracnose resistance. Progress will be shared on initial screening results, evaluation of horticultural characteristics, and selection of potential lines for crossing programs.