• 한국잠사곤충학회지
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• 제13권2호
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• pp.135-139
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• 1971

1. Ecdysterone의 숙화 촉진작용은 5령 성식기이후에 유효하다. 2. Ecdysterone은 누에의 숙화를 촉진하고 또 초숙잠과 종숙잠간의 시차폭을 축소시킨다. 3. Ecdysterone의 숙화 촉진작용은 Ecdysterone의 식하량과 비례한다. 4. Dodecyl alcohol 주제의 DAT는 등족작용을 촉진한다. 5. Ecdysterone과 Dodecyl alcohol의 병용은 숙화와 등족을 촉진하여 자연상족을 가능케 하며 상족기술 개량에 공헌할 줄 믿는다.

• International Journal of Industrial Entomology and Biomaterials
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• 제12권2호
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• pp.51-56
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• 2006

Use of products containing phytoecdysteroid (PE) as active principle has become popular in prominent sericultural areas of India for hastening larval maturation events and synchronizing cocoon spinning activities as an obvious advantage is assured. At times, the present recommendation of administering PE at the onset of spinning results in peak labour requirement at odd hrs. To enable making recommendation for the use of PE on $multi{\times}bivoltine$ silkworm hybrids based on the climatic conditions prevailing in different areas especially with regard to temperature, the experiment was taken up to determine proper treatment times so that the induced spinning will be more orderly and the labour can be leveraged more efficiently. Different brackets of low ($18-22^{\circ}C$), medium ($24-28^{\circ}C$) and high ($29-32^{\circ}C$) temperature were simulated during the latter half of V larval instar and cocoon spinning. PE was administered to $multi{\times}bivoltine$ silkworm ($BL67{\times}CSR101$) hybrid batches as per the recommended dose at three different times viz., 10 am, 4 pm and 10 pm. Three replicates of 100 larvae were maintained for each treatment. Absolute controls were also maintained in each temperature range to compare the results. Cumulative maturation percentage was recorded at 6 hrs interval to ascertain peak mounting span. The influence of the treatment on the cocoon traits also was studied. Based on the peak mounting span, it was evident that in low temperature 10 pm treatment would be better. In medium and high temperature, treatment at 4 pm proved to be a better option. The influence of the treatment times at different temperature range on labour management is discussed.

• 생명과학회지
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• 제7권4호
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• pp.342-346
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• 1997

This experiment was carried out to clarify the effects of gibberellin(GA) aplication and bagging on repeening and quality in 'Delaware' grape berries. Treatments are 4 plots(2X2 factorial experiment); GA, GA+bagging, bagging and control. The clusters were dipped twice in 100 ppm GA with GA treatment : 10 days before and after the full bloom. The results obtained as follows: 1. GA treatment made the seedless grape berry reduced in the fresh weight but it hastened the ripening period about 2 weeks. 2. Total soluble solid(TSS), viscosity and pH value of berry juice increased with maturation. The concentration of TSS and viscosity were higher in GA treatment plot than GA non-treatment. 3. Berry-hardness, titratable acidity and alcohol inslouble solid(AIS) decreased with maturation. Expically berry-hardness and AIS decreased more greatly in GA non-treatment than GA treatment. 4. The concentration of anthocyanin increased with ripening but pectic substance didn't fluctuate nearly. These of anthocyanin and pectin were higher in GA non-treatment plot than GA treatment. 5. By analysis of factorial experiment GA treatment was highly significant with the $^{o}$Brix/Acidity ratio, juice viscosity and AIS, but high negatively, significant with berry-hardness and berry fresh weight. And it was significant with T S S and negatively, titratable acidity. Bagging was significant with $^{o}$Brix/Acidity ratio and AIS content, but negatively, titratable acidity. 6. Qualitative characters were high correlated with the $^{o}$Brix/Acidity ratio in simple correlation but direct effect by the path-coefficient analysis didn't coincide with simple correlation. The direct effect of pH was large and juice viscosity, the next. And that of berry-hardness was negligible but, AIS, small negatively.

• International Journal of Industrial Entomology and Biomaterials
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• 제14권1호
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• pp.63-68
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• 2007

The response of silkworm, Bombyx mori L. to phytoecdysteroid (PE) when administered at different ages of $5^{th}$ instar was studied in the popular bivoltine ($CSR2{\times}CSR4$) and multi${\times}$bivoltine ($PM{\times}CSR2$) silkworm hybrids, reared on the Victory-1 variety of mulberry leaves. PE was administered to $5^{th}$ instar silkworm per os at a rate of $250{\mu}g$ per 100 larvae to different batches of silkworm at 0, 24, 48, 72, 96, 120, 144 hrs and at the onset of cocoon spinning when a few larvae were ripe. The larval and mounting duration, cocoon yield and cocoon characters were influenced by PE. The intensity of influence was dependent on the time of application. The larvae treated at the beginning of the instar, improved the economic traits significantly with a marginal increase in larval duration. In the larvae treated at the middle of the instar, larval duration was shortened remarkably but the economic traits were adversely affected. This particular treatment can become a good management strategy in the case of mulberry leaf shortage or disease incidence. In the larvae treated at the onset of cocoon spinning, the mounting duration was substantially reduced without much effect on the cocoon traits which would be a big benefit in commercial sericulture. The physiological significance of varied response of silkworm to PE administration is discussed.

• 농업과학연구
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• 제19권1호
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• pp.9-15
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• 1992

성숙기(成熟期)의 기온저하(氣溫低下)로 품질저하(品質低下)를 초래 하는 중부지방(中部地方)의 '풍수(豊水)' 재배(栽培)에 있어서 gibberellin paste의 처리효과(處理效果)가 과실(果實)의 비대생장(肥大生長)과 숙기(熟期) 및 품질(品秩)에 미치는 영향(影響)을 조사(調査)한 결과(結果) 다음과 같은 결과(結果)를 얻었다. 유과기(幼果期)의 $GA_{3+4+7}$ paste 처리(處理)는 GA의 지속적(持續的)인 공급(供給)으로 과실(果實)의 비대(肥大)를 촉진(促進)시킬 뿐 아니라 절대적 생장량(生長量)을 증가(增加)시킬 수 있는 것으로 밝혀졌다. 성숙기(成熟期)에 과육(果肉)의 경도(硬度)가 다소 감소(減少)되었지만 기타의 품질(品秩)에 미치는 영향(影響)은 인정(認定)되지 않았다. 하지만 $GA_3$의 효과(效果)는 인정(認定)되지 않았다. $GA_{3+4+7}$의 처리(處理)는 과실(果實)의 ethylehe 발생(發生)에는 큰 영향(影響)을 미치지 않았지만 지색(地色)의 변화(變化)를 촉진(促進)시켜 성숙기(成熟期)를 3~5일 정도(程道) 앞당길 수 있었다. 따라서 본 연구(硏究)의 결과(結果)는 중부지방(中部地方)의 '풍수(豊水)' 재배(栽培)에 있어 상품성(商品性)이 높은 과실(果實)의 생산기술(生産技術)로 활용(活用)할 수 있을 것으로 기대된다.