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Sameena Sheikh,노재종,성문호,정기태,김정만 한국원예학회 2015 Horticulture, Environment, and Biotechnology Vol.56 No.1
A total of sixty one germplasm lines of watermelon were selected based on differences in fruit size. First year (2012), the young seedlings were exposed to low temperature stress 20/10 ± 2℃ (day/night) for 15/9 hours (day/night, 21:00 to 06:00 HR) inside the growth chamber for 1-week, then second stress treatment 10/5 ± 2℃ was given, and seedlings were maintained at this for continuous 10 days. The control seedlings were throughout maintained at 28 ± 2℃ till the end of experiment. Thirteen best performing germ plasmlines were selected based on different growth and physiological traits. Second year (2013), these young seedling were subjected to chilling stress (5/5 ± 2℃, day/night) for 15/9 hours (day/night, 21:00 to 06:00 HR). The seedlings were raised in plug trays filled with commercial soil mixture and kept moist with Hoagland nutrient solution on daily basis. Based on the present experimental findings, 10102, 10124, 10398, and 10491 were selected as best performing germplasm lines for more most of traits (shoot dry weight per plant, stem length per plant, leaf number per plant, root length per plant) studied in chilling stress, and also maintained high cellular membrane integrity, chlorophyll fluorescence, protein content, and peroxidase activity. Hence, chilling stress 5℃ was considered to be as better critical range for facile means of selecting tolerant and sensitive germplasm lines at young seedling stage in watermelon based on different growth parameters studied.
Sameena Sheikh,노재종,성문호,정기태,김정만,주호종,허윤찬 한국원예학회 2013 Horticulture, Environment, and Biotechnology Vol.54 No.6
The goal of this investigation was to identify phenotypic traits that effectively distinguish tetraploid from diploid watermelon [Citrullus lanatus (Thunb.) Matsum. et Nakai) at various stages of growth. Assays for phenotypic markers were performed on five regular diploid cultivars (WC-8C-2C, WD-2-6K, GW11, GW7, and GW2) exposed to the alkaloid colchicine (0.1 or 0.2%) from January 2010 to August 2011 at Watermelon Experiment Station,Gochang, Jeonbuk, South Korea. Tetraploids were induced using treatment to one of three plant parts: directly on seed (DS), shoot apex (SA) or inverted hypocotyl (IH). Results showed that tetraploid plants exhibit shorter internode length, wider leaf width with high degree of blistering, light green fruit with greyish stripes, and thicker pericarp as compared to the diploid control. In tetraploids, the stamina of the male flower was erect to semi-erect with deep yellow to light green color. No major differences were observed in fruit size and weight between the tetraploid and diploid, and both characteristics were considered unreliable indicators of level of the ploidy during early growth stages of T0 plant. Length, width, and overall size of the seed were remarkably greater in tetraploids. Seeds of tetraploids had broad apical ends and fissures along the longitudinal axis. Number of seeds per fruit and 100 seeds weight of the tetraploid were 51.5 and 4.25 g, respectively. Results identified specific phenotypic traits that could be used to reliably identify tetraploid watermelon in T0 plants in the field. In the future, these traits could potentially be used to develop more efficient watermelon triploid breeding programs.
노재종,Sameena Sheikh,전형권,성문호,임정현,이소근,정기태,김정만,주호종,허윤찬 한국원예학회 2012 Horticulture, Environment, and Biotechnology Vol.53 No.6
To screen a suitable method for inducing tetraploid with high frequency, five diploid inbred lines of watermelon,WC-8C-2C, WD-2-6K, GW11, GW7, and GW2 were selected. The efficiency of chromosome doubling with three methods direct seed (DS), shoot apex (SA), and inverted hypocotyl (IH) were tested by applying two different concentrations (0.1% and 0.2%) of antimitotic agent, colchicine, during the period January, 2010 to August, 2011 at Watermelon Experiment Station, Daesan, Gochang, Jeonbuk, South Korea. Mean chloroplast counts were 12 and 19in diploid and tetraploid, respectively. The highest rate of efficiency of generating tetraploids (29.5%) was recorded in 0.2% IH method and considered as s best method. A total of 71 new tetraploids were generated successfully using present methods and techniques. WC-8C-2C and GW7 produced maximum number of tetraploids.
Phanna Phat,Sameena Sheikh,Jeong Hyeon Lim,Tae Bok Kim,Mun Ho Seong,Hyong Gwon Chon,Yong Kyu Shin,Young Ju Song,Jaejong Noh 한국원예학회 2015 원예과학기술지 Vol.33 No.6
One of the main factors restricting production of triploid seedless watermelon is poor germination due to weak embryos, thick seed coats, and larger air spaces. This study was carried out to investigate the priming effects of different concentrations of chemicals, including hydrogen peroxide (H₂O₂), fusicoccin, and gibberellic acid (GA) on germination and seedling uniformity of triploid watermelon (Citrullus lanatus). Three commercial triploid cultivars, Seedless Plus, Sinus, and Sizero, were pretreated with water and different levels of H₂O₂ (2 and 4%), fusicoccin (FC: 1, 5, and 10 μM), and GA (1, 5, and 10 μM). The present findings helped to find optimal priming conditions for improving germination of triploid watermelon. Treatment with 5 μM GA and hydropriming helped to break seed dormancy, enhancing the final germination percentages in all triploid cultivars and increasing the germination index in Sizero. These seed-priming treatments could be used on large scale for industrial applications. Moreover, hydropriming provides a simple, effective, and costless method to improve seed germination and seedling vigor of Sinus and Sizero varieties.
Phat, Phanna,Sheikh, Sameena,Lim, Jeong Hyeon,Kim, Tae Bok,Seong, Mun Ho,Chon, Hyong Gwon,Shin, Yong Kyu,Song, Young Ju,Noh, Jaejong Korean Society of Horticultural Science 2015 원예과학기술지 Vol.33 No.6
One of the main factors restricting production of triploid seedless watermelon is poor germination due to weak embryos, thick seed coats, and larger air spaces. This study was carried out to investigate the priming effects of different concentrations of chemicals, including hydrogen peroxide ($H_2O_2$), fusicoccin, and gibberellic acid (GA) on germination and seedling uniformity of triploid watermelon (Citrullus lanatus). Three commercial triploid cultivars, Seedless Plus, Sinus, and Sizero, were pretreated with water and different levels of $H_2O_2$ (2 and 4%), fusicoccin (FC: 1, 5, and $10{\mu}M$), and GA (1, 5, and $10{\mu}M$). The present findings helped to find optimal priming conditions for improving germination of triploid watermelon. Treatment with $5{\mu}M$ GA and hydropriming helped to break seed dormancy, enhancing the final germination percentages in all triploid cultivars and increasing the germination index in Sizero. These seed-priming treatments could be used on large scale for industrial applications. Moreover, hydropriming provides a simple, effective, and costless method to improve seed germination and seedling vigor of Sinus and Sizero varieties.