• 원예과학기술지
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• 제34권3호
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• pp.396-404
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• 2016

In this study, four cultivars of strawberry commonly grown in South Korea, 'Daewang', 'Seolhyang', 'Maehyang', and 'Ssanta', were evaluated for several qualities, including the presence of phytochemicals, sugar content, organic acids, and fruit hardness. The plants were cultivated on a high-bench bed system in a plastic greenhouse and drip irrigated. Fruit samples were collected three times in February 2013 to analyze the fruit characteristics. We found that the fruit hardness of the 'Daewang', 'Maehyang', and 'Ssanta' cultivars was greater than that of 'Seolhyang', however 'Seolhyang' showed the highest moisture content of all the cultivars, indicating that fruit hardness was negatively associated with moisture content. Furthermore, 'Seolhyang' was found to have the highest levels of phenolic compounds and anthocyanins compared to the other cultivars. 'Maehyang' had the highest amount of total sugars. 'Seolhyang' and 'Maehyang' accumulated higher amounts of total organic acids. As a result, 'Daewang' and 'Maehyang' were expected to be preferred by consumers because they had the highest ratio of sugar to total acid in their fruit.

• 농업생명과학연구
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• 제50권2호
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• pp.45-52
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• 2016

딸기의 내저온성 품종육성을 위한 우수 교배친 선발을 위해 '다홍', '감홍', '매향', '설향'을 자방친으로 이용하고 '다홍', '감홍', '매향', '설향', '수경', '선홍', '원교3111호' 등을 화분친으로 하여 24조합을 작성하고 조합능력 검정을 실시하였다. 그 결과, 자방친을 '다홍'으로 하였을 경우에는 전체조합에서 과중이 작아지는 경향이 있었고, '감홍'은 생존율이 낮아 두 품종은 자방친으로 적합하지 않은 것으로 나타났다. 화분친에 있어서도 '선홍'을 화분친으로 이용한 경우 경도가 낮아지는 경향이 있었고, '수경'은 기형과가 다소 발생하는 경향이 있어 화분친으로 적합하지 않았다. 그러나 '매향'과 '설향'을 자방친으로 이용할 경우 발아율과 생존율이 상대적으로 높았고, 과실품질이 우수하고 수량성도 높은 것으로 나타났다. 따라서 '매향'과' 설향'이 자방친으로 우수하였고, 화분친으로는'매향', '설향', ' 원교3111호' 등이 우수하였다. 특히, '매향' × '설향', '설향' × '매향', '설향' × '원교3111호' 조합은 당도, 과실크기, 경도, 수량성 측면에서 우수성이 인정되기 때문에 내저온성 교배조합으로 적합하다고 판단된다.

• 동아시아식생활학회지
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• 제26권1호
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• pp.80-87
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• 2016

본 연구는 '설향'과 '장희' 두 품종의 품종별, 성숙도별에 일반 성분분석과, 항산화 물질함량, 항산화능을 비교하였다. 미숙과가 완숙과보다 경도가 더 높았으며, '설향'이 '장희'보다 단단하였다. 당도에서는 품종별의 차이를 보이지 않았으나, 과일이 성숙이 되면서 당도는 증가하였다. 산도는 미숙과가 완숙과보다 높게 측정되었으며, 과일이 완숙이 되었을 때는 '설향'보다 '장희'의 적정 산도가 더 높게 측정되었다. 총 페놀화합물 함량과 플라보노이드 함량에서는 '설향'이 '장희' 품종보다 더 우수하게 나타냈으며, 총 페놀화합물 함량의 경우 미숙과와 완숙과와는 유의차가 없었다. 총 안토시아닌 함량은 두 품종 모두 성숙과가 많은 양을 나타내었고, '장희' 품종이 '설향'보다 더 높게 나타났다. 항산화능에서는 DPPH 라디칼 소거능과 ABTS 라디컬 소거능 모두 '설향'이 '장희' 품종보다 더 우수하게 나타났다. 안토시아닌을 제외한 항산화 물질함량과 총 항산화능과는 매우 높은 상관 관계를 나타내었다. 본 연구 결과를 종합해 볼 때, 딸기의 당산비 등을 고려했을 때 완숙과를 섭취하는 것이 관능적으로 우수할 것으로 판단되나, 품종에 따라서 미숙과의 항산화 물질 및 항산화능이 높은 경우도 있어서 이러한 미숙과나 재배 중 발생하는 적과, 태풍 등 자연 환경변화에 따른 낙과를 이용한 다양한 기능성 원료의 개발도 충분히 가치가 있다고 사료된다.

• 한국육종학회지
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• 제42권4호
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• pp.374-380
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• 2010

딸기의 우수한 교배친을 선발하기 위해 11품종의 자방친을 자식시켜 후대실생 개체들의 성능 검정한 결과 초세, 내병성, 수량성 등이 우수한 '아키히메', '매향', '설향' 등 3품종을 자방친으로 선발하였다. 선발된 3품종에 대하여 조합능력 검정을 한 결과 초세는 '아키히메'가 자방친인 조합에서 가장 우수하였고, 성숙기는 '설향'이 자방친인 조합에서 빠른 경향이었다. 그리고 '설향' ${\times}$ '도치오토메', '설향' ${\times}$ '금향', '설향' ${\times}$ '원교3111호', '아키히메' ${\times}$ '원교3111호'등의 조합은 18 g 이상의 대과종의 개체 비율이 높았다, 당도는 조합별로 큰 차이가 없었지만, 경도는 '매향'조합에서 높은 경향이었는데, 특히 '매향' ${\times}$ '도치오토메' 조합에서 높았다. 수량은 '아키히메' ${\times}$ '원교 3111호' 조합에서 가장 많았고, 그 다음이 '설향' ${\times}$ '금향', '매향' ${\times}$ '금향', '아키히메' ${\times}$ '도치오토메' 순으로 높았다.

• 한국환경과학회지
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• 제29권4호
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• pp.415-421
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• 2020

This study was conducted to determine the optimum conditions for the treatment of polyamine to promote pollen germination and improve the fruiting rate by overcoming fertilization defects in low-temperature strawberry cultivation. The optimum temperature for pollen germination of strawberries was 30 ℃ for Seolhyang and 25 ℃ for Maehyang, and Seolhyang had a higher pollen germination rate than that of Maehyang. The addition of polyamines, namely spermine and putrescine to the medium improved the pollen germination rate and spermine treatment showed a better effect than putrescine treatment. The proper polyamine type and treatment concentration for enhancing the potency of pollen germination was 500 μM of spermine for both Seolhyang and Maehyang, which improved the pollen germination rate by 19-23% compared with that of the control. However, combined treatment of spermine and putrescine, resulted in a lower germination rate lower than that of the single treatment. Our results indicated that the treatment of polyamines during flowering in protected cultivation of strawberrise can improve the fruiting rate by overcoming the problem of poor pollen germination due to low temperature.

• 원예과학기술지
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• 제30권4호
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• pp.378-384
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• 2012

Three Korean-bred strawberry cultivars 'Maehyang', 'Seolhyang', and 'Keumhyang', and a Japanese cultivar 'Tochiotome' were grown in a greenhouse and their physicochemical characteristics were investigated. Fruit weight of 'Seolhyang' and 'Keumhyang' in the first and second fruit clusters were greater than those of other cultivars and that of 'Tochiotome' was the greatest in the fifth fruit cluster. Fruit firmness generally decreased at later fruit clusters, and was the lowest in 'Seolhyang'. The sugars/organic acids ratios in the first and third fruit clusters of 'Maehyang' were 4.9 and 8.0, respectively, representing the highest values among all cultivars. The ascorbic acid content was the greatest in the second fruit cluster for 'Seolhyang', 'Keumhyang', and 'Tochiotome' cultivars and that of 'Maehyang' was the greatest at the third fruit cluster. The anthocyanin content was higher in later fruit clusters and was the highest in 'Keumhyang' overall. Results indicate that Korean cultivars bred for the plastic protected culture, which are intended for very early harvest, showed more desirable physical characteristics in the first and second fruit clusters, while the content of anthocyanin was greater in the fruits from later fruit clusters.

• 한국환경과학회지
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• 제31권11호
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• pp.951-958
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• 2022

The aim of this study was to determine the optimum level of carbon dioxide to maximize the quality and yields of strawberries cultivated in a greenhouse. Specifically, two strawberry cultivars, namely, 'Seolhyang' and 'Maehyang', were subjected to varying concentrations of carbon dioxide and patterns linked to their productivity were noted. Both cultivars showed improvements across various physical variables (i.e., leaf area, crown diameter, plant height, fresh weight, and dry weight) when carbon dioxide concentrations were at 1,500 ppm. The optimum carbon dioxide concentration for increased fruit yields and quality was 1,000 ppm. When carbon dioxide was at 1,000 ppm the yields of 'Seolhyang' and 'Maehyang' increased by 1.99 and 1.78 times, respectively, compared to control plants. The influence of carbon dioxide on fruit color was negligible. However, the carbon dioxide increased the sugar content and sugar-acid ratio of the experimental fruits compared to control plants. Specifically, the sugar-acid ratio, which is directly related to taste, was at its highest when the concentration of carbon dioxide was at 1,000 ppm (i.e., for both 'Seolhyang' and 'Maehyang'). Overall, the application of carbon dioxide culminated in improved yields and fruit quality for both cultivars of interest.

• 원예과학기술지
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• 제29권3호
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• pp.172-180
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• 2011

The net photosynthetic rate of 'Seolhyang' strawberry plants was measured daily for 7 days after treatment at three UV illumination dosages (0, 9.8, and 29.5 $kJ{\cdot}m^{-2}$). The net photosynthetic rates of the strawberry plants with 9.8 and 29.5 $kJ{\cdot}m^{-2}$ UV light illumination decreased by 20.2 and 61.4%, respectively, at 7 days after UV light treatments. UV treatments with two illumination dosages (7.9 and 15.7 $kJ{\cdot}m^{-2}$) altered the phenolic compounds contents during the cultivation period when compared to those in the control fruits. The anthocyanin content with 7.9 $kJ{\cdot}m^{-2}$ UV light illumination of 'Seolhyang' increased by 18.7% compared with those in control fruits at the 11 DAT. However, the anthocyanin content of 'Maehyang' was not significantly different among treatments during experiment period. The highest level of ellagic acid was found with 7.9 $kJ{\cdot}m^{-2}$ UV light illumination in both cultivars at the 11 DAT. Our results showed that strawberries illuminated with UV light during cultivation period had higher bioactive compounds contents than control fruits. These results suggest that UV light treatments may be a useful non-chemical way of promoting strawberry fruits quality.

• 한국환경과학회지
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• 제26권3호
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• pp.381-392
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• 2017

The present study aimed to investigate the effects of low temperature on the growth, yield, quality, and biologically active compounds of strawberry and obtain basic information for developing a technology for stable growth of strawberry in greenhouses. Growth of strawberry, including leaf number, area, and length, plant height, and dry weight was better at the optimum growth temperature of $20^{\circ}C$ than at a lower temperature of $15^{\circ}C$. At the low temperature of $15^{\circ}C$, the cultivar 'Maehyang' was more tolerant and displayed better growth rate than 'Seolhyang'. At $15^{\circ}C$, the fruit production per week and fruit weight was lower than that at $20^{\circ}C$. In contrast, fruit length and diameter were not significantly different between the two growth temperatures. Growth temperature also did not affect the fruit color index, Hunter L, a, b value, or fruit firmness. However, the sugar content of strawberries grown at $15^{\circ}C$ was higher by 0.8 and 1.5 Brix for 'Seolhyang' and 'Maehyang', respectively, than of those grown at $20^{\circ}C$. There was no difference in the content of fisetin, a biologically active compound, for 'Seolhyang' at both growth temperatures, however, the fisetin content of 'Maehyang' was higher at $20^{\circ}C$ than at $15^{\circ}C$. Cinchonine and ellagic acid content of 'Seolhyang' was higher at $20^{\circ}C$ than at $15^{\circ}C$, whereas that of 'Maehyang' was higher at $15^{\circ}C$ than at $20^{\circ}C$. Quercetin content showed no significant differences with respect to growth temperature, however, it tended to increase at $20^{\circ}C$. The cinnamic acid content of 'Seolhyang' was higher at $15^{\circ}C$ than at $20^{\circ}C$, whereas that of 'Maehyang' increased at $20^{\circ}C$. Collectively, the biologically active compounds of strawberry were affected by growth temperature. Moreover, the content of these compounds tended to increase at $20^{\circ}C$, the optimum growth temperature, rather than at the sub-optimal growth temperature of $15^{\circ}C$.

• 한국환경과학회지
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• 제27권8호
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• pp.631-639
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• 2018

A Cultivation method to minimize the damage caused by high temperatures was studied by investigating the effects of groundwater cooling treatment on the growth, yield, and quality of strawberries. In the groundwater cooling treatment, the daily average temperature of the rhizosphere was reduced from $26.9^{\circ}C$ to $24.9^{\circ}C$. The root length increased by 0.3-9.2 cm, depending on the cultivar and growth period. The leaf number, leaf area, leaf length, leaf diameter, and plant height also increased, especially in the cultivars 'Seolhyang' and 'Maehyang', resulting in higher fresh and dry weights. The number of fruit per plant increased from 7.7 to 12.5 in 'Seolhyang', and the fruit weight increased by 0.3 g in 'Seolhyang' and 1.3 g in 'Maehyang'. The fruit hardness increased, but no significant difference in fruit coloration was observed. The sugar content of the fruit was improved by $0.2-0.3^{\circ}Brix$. Therefore, groundwater cooling of the rhizosphere was effective in improving the growth and productivity of strawberries under abnormally high temperature conditions and can be considered a cost-efficient cooling system.