• International Journal of Industrial Entomology and Biomaterials
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• 제6권1호
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• pp.15-19
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• 2003

The study evaluated the influence of feeding different maturity leaves i.e., tender, medium, coarse and mixed leaves of three different maturity during late larval stages of new bivoltine race $(CSR_{3} {\times} CSR_{6})$. The data were compared with shoot feeding and control batches in which conventional feeding method was followed. The most of the larval and cocoon characters were recorded significantly higher in tender leaves fed batches followed by T4 batch (2 times tender and 1 time coarse leaves). Lowest melting percentage (1.494%) was recorded in T4 and highest (4.69%) was recorded in coarse leaf (T3) fed batches. Significantly higher post cocoon parameters viz., average filament length, non-breakable filament length, renditta and raw silk percentage were recorded in tender loaves fed batches.

• 한국연초학회지
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• 제6권1호
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• pp.73-78
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• 1984

The changes of contents of organic acids in flue-cured tobacco leaves depending on stalk position and maturity viz immature, mature and overmature were studied in 1982-83. Among them, particularly, the leaves harvested at mature stage have the lowest amounts of oxalic and citric acids in smoking or cutter leaves but the acid contents has increased during the overmature. The linolenic acid content tended to be lower with increase of maturity.

• Journal of the Korean Wood Science and Technology
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• 제52권5호
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• pp.450-458
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• 2024

Litsea elliptica, a Southeast Asian tree with a rich history of medicinal applications, is attracting increasing research attention. This study investigated the effects of leaf maturity and solvent selection on the extraction of bioactive compounds from L. elliptica leaves, specifically with regard to their antioxidant activity. 2,2'-Azino-bis(3-ethylbenzothiazoline)-6-sulfonic acid (ABTS) method was employed to quantify the free radical scavenging capacity of L. elliptica leaf extracts prepared using three different solvents (n-hexane, ethyl acetate, and ethanol) at three different leaf stages (tender, immature, and mature). These results highlight the significant effects of leaf maturity and solvent selection on the extraction of phenolic compounds and flavonoids from L. elliptica leaves. Ethanol is the most effective solvent for the extraction of bioactive compounds, particularly from mature leaves. The ethanol extraction of tender leaves demonstrated potential for optimizing the antioxidant content. Further research is necessary to investigate the specific factors influencing the observed differences in antioxidant activity between leaves of varying ages and the potential impacts of other bioactive compounds present in the leaves.

• 한국작물학회지
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• 제12권
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• pp.43-48
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• 1972

CEPA를 답전작 및 우기전에 수확이 가장 빨리 촉진되면 또 니코친 함량이 저감되는지를 알고저 Yellow Special A 품종을 공시하여 적심 직후해당 농도의 CEPA 수용액을 살포한 후 일정기간을 두고 수확하여 처리수준별 성숙도 및 전 alkaloid함량을 조사하였던 바 그 결과는 다음과 같았다. 1) 처리농도가 높을수록 잎담배 성숙에 미치는 효과가 컸으며 그 효과는 처리 후 6-11일간에 있어서 현저하였다. 2) CEPA는 엽표면에만 처리해도 효과가 있으며 성숙촉진효과는 처리부분에 있어서 더욱 뚜렷하였다. 3) 처리농도가 높을수록 잎담배의 전 alkaloid 함량이 감소되는 경향이 있으며 그 효과는 성숙촉진작용후에 더 크게 나타났다. 4) CEPA의 성숙촉진작용은 성수기에 가까운 하부엽에서 컸고 alkaloid 축적억제작용은 반대로 숙기에 도달하지 않은 상부엽에서 컸다. 그러나 적기수확엽에 있어서는 축적억제효과가 부위에 관계없이 같았다. 5) CEPA 처리는 수량에 변화를 주지 않았으며 시용 적정농도는 500-2,000ppm 사이라고 느껴졌다. 6) CEPA의 성숙촉진 및 alkaloid 합성억제작용의 기구에 관하여는 금후 더욱 연구할 필요가 있다고 보았다.

• 한국작물학회지
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• 제32권3호
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• pp.347-352
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• 1987

버어리 21을 공시품종으로 하여, 시비량을 전량기비구에서는 표준시비 외 증비 2처리와 기 추비구에서는 표준량을 기비로 하고 추비 2 처리를 두어 질소수준 및 시비방법과 수확시기의 차이가 엽중전질소 및 전알카로이드함량에 미치는 영향을 밝혀서 전질소화합물이 낮은 잎담배를 생산코자 본 시험을 수행하였던 바 그 결과를 요약하면 다음과 같다. 1. 질소 증비에 따라 부풀성이 저하되었다. 2. 질소량을 증시 할수록 성숙이 지연되었고 엽중전질소 및 알카로이드함량도 증가되었으며, 기비 보다도 추비에 의해서 그 영향이 크게 나타났다. 3. 엽중 전질소함량은 적심 전이 가장 높았고, 이후 생육기간이 길수록 감소되었는데 상위엽에서 감소폭이 더 컸다. 4. 엽중 알카로이드함량은 적심기부터 증가하여 생육기간이 길수록 점차 더 증가되었고, 상위엽에서 증자폭이 더 컸다.

• 한국연초학회지
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• 제4권1호
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• pp.37-42
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• 1982

Korean local and introduced varieties were classified by the cluster analysis of correlation and taxonomic distance based on nineteen growth characters. 1. Thirty six varieties can be classified into three groups(I, II, III) by WVGM (weighted variable group method) 2. Major characters for classifying cultivars were days to flowering, number of leaves, leaf length, stem diameter and width of midrib: the five characters seemed to be useful in monothetic classification. 3. Korean varieties were similar to oriental, and japanese varieties to taiwan. 4. WVGM was more accurate and meaningful than classification by WPGM (weighted paired group method) and reticulate diagram of correlation. 5. Characteristics of each group: Group I closely related to many leaves, late of maturity and broad leaf type, Group II related to medium leaves, late of maturity and narrow leaf type, Croup 19 related to few leaves, early of maturity and medium leaf type respectively.

• 한국식물병리학회지
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• 제13권4호
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• pp.215-218
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• 1997

감나무 둥근무늬낙엽병 이병엽에서의 이듬해 봄 위자낭락 성숙에 영향을 미치는 환경요인에 대한 검토를 하였다. 월동 후 이병엽에서 위자낭각이 완전히 성숙되는 시기는 대체로 4월 하순이었는데 이때의 평균 기온은 $14^{\circ}C$ 정도였고 충분한 강우가 있을 때였다. 낙엽시기에 따른 성숙 정도는 10월 초에 낙엽된 이병엽이 11월 초 낙엽된 이병엽보다 성숙율은 상당히 높았으나 성숙시기에는 차이가 없었다. 월동장소에 따른 차이는 야외에서 월동된 이병엽은 온실에서 보관되었다가 이듬 봄에 야외에 노출한 것보다 성숙시기가 20일 정도 빨랐고 성숙율도 훨씬 높았다. 그리고 분생포자를 인공접종하여 발병된 이병엽에서도 위자낭각이 다수 형성되었고 이듬해 봄 성숙율도 자낭포자의 자연감염에 의한 병반에서와 큰 차이가 없었다.

• Journal of Plant Biology
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• 제17권1호
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• pp.15-21
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• 1974

The most commonly grown economical and flue-cured tobacco cultivar Yellow Special A was used in pot-culture tests in order to study Ethrel (2-chloroethyl phosponic acid) effects on accelerating maturity of tobacco leaves in relation to the most adequate level of the chemical useful for field growing, nitrogen level in soil for the most pronounced response, and the most suitable spray period during the growth stages of pre-, post- and topping periods. The following conclusions, thus, were obtained from the present studies; 1. 500ppm Ethrel spray was reconfirmed to be adequate in the practical applications, although the extent of yellow-ripening of tobacco leaves was increased as the Ethrel level increased. The highest leevel treated resulted in causing chemically damaged lesions on leaves and early defoliation. 2. Ethrel-treated leaves showed deeper yellowish tinge to them than those without treatment, while different levels of the chemcial had less influence on the tinge. 3. An adequate level of nitrogen supply to plants favored the Ethrel response, whereas either very low or high level of nitrogen in the soil lowered the chemical effect on accelerating the yellow-ripening. When carbohydrates versus total nitrogen ratio became relatively high, the condition brought out some outstanding Ethrel effects. 4. Chlorophyll level of leaves increased as soil applications of nitrogen level increased, and that also increased carotenoid level of the tobacco leaves. Ethrel-treated leaves showed deeper orange tinge than those without treatment, while the highest level of nitrogen application showed the deepest orange tinge to tobacco leaves. 5. Pre-topping treatment (12 days before topping and flowering) resulted in almost no Ethrel response, and that treatment right on the day of topping, showed response of yellow-leaf ripening at nearly bottom-half leaves of a tobacco plant. The post-topping treatment (12 days after topping) made plants showing full response of Ethrel from bottom to the top leaves of tobacco plant in accelerating the leaf maturity. 6. The extent of Ethrel responses on accelerating yellow-ripening of tobacco leaves was discussed for the modifying influences brought about by certain environmental factors. Discussions were also made about the possible practical applications (particularly for pre-rice planting) and quality difference that may be caused by such growth environments.

• 한국연초학회지
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• 제18권1호
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• pp.5-11
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• 1996

Field experiment was conducted to get the basic information about the difference in color and plastid pigments at the different stage of harvest of flue-cured tobacco cultivated in paddy field, and compared to upland ones. All tested crops were primed in lots of 3 to 4 at each priming, beginning at the bottom of the plant. Leaf pigments and chromatic values of tobacco leaves were determined in samples collected at weekly intervals, and according to analyses obtained from 4 stalk positions. By the degree of maturity, leaves harvested were separated with visual characters into four classes of immature, mature, ripe and mellow. regardless of stalk position, chlorophyll contents was higher in the order of immature > mature > ripe > mellow, respectively. In fresh leaves, chlorophyll levels was higher with ascending stalk position. chlorophyll a and b in cured leaves were less than 10% of the amount present at harvest, and it was estimated that maturity condition also influenced the rates of degradation of plastid pigments. Fully mature leaves of upland diverted from paddy field showed slightly higher in chlorophyll contents than in those of upland tobacco ones but somewhat lowered in $L^*$ and $b^*$ values, and there was no difference in $a^*$ value.

• 한국식품과학회지
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• 제53권2호
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• pp.133-138
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• 2021

국내에서 재배한 A. melanocarpa 잎의 성숙도에 따른 이화학적 특성 변화, 항산화 물질 조성 변화 및 항산화 능력과 같은 기능적 특성을 분석하여, 아로니아 잎의 성숙도별 이용 가능성을 확인하였다. A. melanocarpa 3품종의 잎의 폴리페놀, 플라보노이드, 페놀화합물 함량은 성숙이 진행될수록 감소하였고, 항산화물질과 상관관계가 높은 ABTS 라디컬 소거능 및 DPPH 라디컬 소거능 역시 감소하는 경향을 보였다. 현재, 블루베리는 잎과 열매 모두 식품원료로 등록되어 있으나, 아로니아의 경우는 식품의약안전처에서 고시한 식품원료목록 상 열매 부위만 등록되어 있는 실정이다. 아로니아 잎에는 chlorogenic acid와 catechol이 다량 함유되어 있고, 아로니아 잎의 항산화 능력은 기타 베리류와 비교하였을 때, 상당히 높은 수준인 것으로 확인된 바와 같이, 아로니아 잎은 향후 가공 식품 이외에 다양한 분야로의 활용 가능성이 충분할 것으로 판단된다.