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배 ‘신고’에 GA3, A3+4+7 및 GA4+7 처리가 과실 형태 및 품질에 미치는 영향
이욱용, 최진호, 천종필, 안영직 배재대학교 자연과학연구소 2017 自然科學論文集 Vol.28 No.1
우리나라에서 많이 사용되고 있는 숙기촉진용 식물생장조절제의 성분 차이에 따른 과실의 형태적 기형 및 품질에 미치는 영향을 조사하였다. 수확기에 과실 무게를 측정한 결과, GA3, GA3+GA4+7 및 GA4+7의 모든 제제에서 과실비대가 유의하게 나타났으며 GA4+7 단용 제제가 가장 높은 비대율을 보였다. 과실의 형태적 이상은 종자생장과 관련이 있는데 GA4+7 제제를 사용한 과실에서 비정상종자발생 비율이 가장 높았다. 저온저장 후 과실의 품질변화에서 GA4+7 제제의 감모율이 가장 높았으며 과육경도의 경우, GA4+7 제제가 GA3+GA4+7 사용 과실에 비해 낮게 나타났다. 이상의 결과를 고려하면 GA4+7의 단용처리구의 경우 과실의 비대효과는 크지만 수확기 이상비대 과실의 출현, 저장 중 경도 감소 등 전반적인 과실품위 유지가 어려울 것으로 판단되므로 지베렐린 이용 시 보다 주의가 필요하다고 판단된다. In this study, we tested the effects of registered or unregistered plant growth regulator gibberellin pastes on fruit shape and internal in 'Niitaka' pears. The treatment of the GA4+7 produced the most enlarged fruit and the fruits treated with unregistered GA paste showed lowest flesh weights among the treatments. Fruit shape of 'Niitaka' pears was closely associated with the formation of normal seeds. And the fruits treated with unregistered GA had the highest proportion of abnormal seed with severe occurrence of abnormal-shaped fruit. We also compared the quality indices after cold storage. The highest fruit weight loss and the lowest flesh firmness values were found in the fruits treated with unregistered GA treatment. Futhermore, the use of unregistered GA products possibly smuggled from other country may occur irregular fruit development through the deficiency of seed development. Consequently, it is recommended that the use of registered GA products such as mixture of GA3 and GA4+7 intensely important to the conformation of high quality fruit production in 'Niitaka' pears.
Ethephon 및 Aminoethoxyvinylglycine 처리가 ‘원황’ 배 모의 수출 환경에서의 품질 및 생리장해 발생에 미치는 영향
최진호,이욱용,안영직,황용수,천종필 충남대학교 농업과학연구소 2013 농업과학연구 Vol.40 No.2
We investigate the effect of preharvest spray of aminoethoxyvinylglycine (AVG), an inhibitor of ACC synthase activity, on fruit quality of ‘Wonhwang’ pear (Pyrus pyrifolia Nakai). And the effects were compared with ethephon which releasing ethylene to elucidate treatment efficacy of ethylene biosynthesis inhibitor on Asian pears. Chemicals were sprayed on 30 days before harvest with AVG (75 and 150 mg/L) and ethephon (100 mg/L), respectively. Highest flesh firmness during 21 days of shelf-life at 25℃ after 30 days of cold storage was attained in the fruit treated with 150 mg/L AVG (26.5N) when compared with untreated control (16.7N), while the fruits treated with 100 mg/L ethephon completely lost their marketability within 14 days of shelf-life by mass drop of firmness down to 11.6N. Low incidence of physiological disorders including pithiness and core browning were attained at the fruits treated with 150 mg/L AVG when we compared with untreated control. No occurrence of mealiness found in the fruits treated with AVG but ethephon treated fruits showed 36.4% during 14 days of shelf-life. Consequently, AVG spray at the concentration of 150mg/L on Asian pear ‘Wonhwang’ fruit regarded as useful preharvest management approach for keeping quality during marketing period after simulated exportation.
봉지종류 및 괘대시기가 ‘원황’ 및 ‘화산’ 배 과실의 수확기 품질에 미치는 영향
정억근,이욱용,안영직,이혁재,황용수,천종필 충남대학교 농업과학연구소 2013 농업과학연구 Vol.40 No.2
We tested fruits quality and skin coloration of two pear cultivar ‘Wonhwang’ and ‘Whasan’ produced by bagging with different kinds of paper bags in the Cheonan area, Chungnam Province, Korea. The fruits were bagged at 35, 45, 55 or 65 days after full bloom (DAFB) with 3 kinds of double layer paper bag which consisted of grey color, yellow color and newspaper for outer layer. The great extent of light interruption was observed in grey colored outer paperbag among three kinds of paperbag which showed only 0.46% of lowest light transmittance when compared with 43.7% and 40.0% of yellow paper and newspaper, respectively. The development of skin redness (a*) increased with the delay of bagging time in two pear cultivars. But the fruits treated at 65 DAFB showed uneven coloration and excessive development of redness which represented low fruit external appearance value. Uniform flesh firmness was attained at the fruits bagged with grey outer color paperbag regardless of bagging time, although the fruit quality indices including soluble solids and titratable acidity did not change significantly by using different kind of fruit bags and bagging time in two pear cultivar. Based on our results, it was explained that the grey-colored fruit bag had positive effect on the development of skin coloration without any detrimental effect on fruit quality factors in ‘Wonhwang’ and ‘Whasan’ pears.
Ug-Yong Lee,Jin-Ho Choi,Ju-Hyun Lee,Kwang-Suk Oh,Jong-Pil Chun 한국원예학회 2017 원예과학기술지 Vol.35 No.5
We evaluated fruit quality and the incidence of physiological disorders in the Asian pear(Pyrus pyrifolia Nakai) cultivar ‘Wonhwang’ in response to 1-methylcyclopropene (1-MCP, 1.0 μL·L-1) treatment and different temperature conditions to determine its appropriate shelf-life period. Postharvest treatment with 1-MCP had a positive effect on ‘Wonhwang’ pears at all storage temperatures (18, 25, and 30°C) with regard to flesh firmness. Marketable fruits (>20 N) were only attainted using 1-MCP-treated fruit after 21 days of storage. A high incidence of physiological disorders and fruit decay was detected in fruits stored at 30°C, whereas a low incidence of physiological disorders including core browning, flesh browning, mealiness, and water soaking was detected in fruits treated with 1-MCP. Ethylene production and respiration rates increased with increasing temperature treatment. We detected high respiration rates in control fruits, reaching approximately two times higher than that of 1-MCP-treated fruits regardless of storage temperature. These results indicate that the efficacy of 1-MCP treatment on Asian pear depends on the storage temperature. Therefore, 1-MCP treatment should help maintain the quality of Asian pear fruits stored in high-temperature regions during the export process.
Ug-Yong Lee,Mao-Hua Wang,Tae-Min Bae,Sung-Joo Kim,Jin-Ho Choi,Young-Jik Ahn,Jong-Pil Chun 한국원예학회 2018 원예과학기술지 Vol.36 No.3
We examined the effects of pre-drying rates, delayed cooling, and carbon dioxide (CO₂) treatment on skin blackening, a major physiological disorder during cold storage in Asian pear (Pyrus pyrifolia Nakai) ‘Chuhwangbae’. Total skin blackening incidence was calculated as the percent disorder index (PDI). PDI significantly decreased with increasing pre-drying rate: the highest PDI was 37.3 for the 1% pre-drying treatment and the lowest PDI was 5.1 for the 4% treatment. Meanwhile, the 5% pre-drying treatment did not show a statistically significant difference from the 4% treatment. A 48-h cooling delay at 20°C was the most effective treatment for preventing skin blackening. PDI after cold storage at 1°C was 6.2, 9.2, and 19.1 for 48-h delay, 24-h delay, and no delay, respectively. In the CO₂ treatment, 2% CO₂-treated fruit showed rapid disorder symptoms from eight days after cold storage at 1°C, and the PDI increased to 19.6 at 12 days and to 63.2 at 20, which was three times higher than the untreated fruits. A decrease in total phenolic content appeared more pronounced in the tissues treated with 2% CO₂, while polyphenol oxidase (PPO) activity in untreated fruits increased with increasing skin blackening incidence. However, there was no increase in PPO activity with the 2% CO₂ treatment, skin blackening appeared to be a CO₂ injury rather than enzymatic oxidation.