• Journal of Crop Science and Biotechnology
• /
• 제11권3호
• /
• pp.187-192
• /
• 2008

The effects of some coumarins(coumarin, 7-hydroxycoumarin, scopoletin and esculetin) were investigated on pumpkin(Cucurbita maxima Duch.) seedlings and on pumpkin glutathione S-transferases(GSTs). Coumarin and esculetin suppressed the growth of seedlings, especially the elongation of roots as well as hypocotyls. Among the compounds tested, only esculetin inhibited the activity of a particular pumpkin GST by 50%, CmGSTU3 toward 1-chloro-2, 4- dinitrobenzene(CDNB) and at a concentration of 22 ${\mu}M$. Both ethylacetae(EtOAc) and water fractions in pumpkin seedlings and different organs of one-month-old pumpkin plants contained esculetin or similar hydrophobic fluorescent substances as well as hydrophilic substances, which showed different degrees of inhibitory effects on CmGSTU3 activity.

• 한국식생활문화학회지
• /
• 제27권1호
• /
• pp.89-94
• /
• 2012

This study was conducted to evaluate the effects of sweet pumpkin (Cucurbita Maxima D.) powder on the quality characteristics of cookies. The cookies were made with various sweet pumpkin powder levels (10%, 20%, and 30%). The pH of the dough increased while the density of the dough decreased as the amount of sweet pumpkin powder increased. The width of cookies determined by water content in dough increased with increasing sweet pumpkin powder level. The L value of cookies was significantly the largest in the control group. The b value was the highest for the 30% substituted sample group. According to textural measurements, the hardness, cohesiveness, springiness, and brittleness of the cookies with sweet pumpkin powder were higher in concentration than those of the control group. According to the sensory evaluation, the appearance, color, flavor, and texture of cookies with 10-20% sweet pumpkin powder were higher compared to those of the control group. The overall most acceptable cookie group was that with 10% added sweet pumpkin powder.

• 한국영양학회:학술대회논문집
• /
• 한국영양학회 2001년도 춘계연합학술대회 초록
• /
• pp.310.1-310
• /
• 2001

• 생물환경조절학회지
• /
• 제19권4호
• /
• pp.372-376
• /
• 2010

최근 애호박은 수확 중 표면 손상을 방지하고, 유통 기간을 연장하기 위해 PET(polyethylene terephthalte)와 PE(polyethylene)를 접합시켜 만든 플라스틱 봉지(두께 0.1mm)를 과실에 덮어씌우는 방법이 시도되고 있다. 본 연구는 플라스틱 봉지의 피복이 애호박의 품질 향상과 유통기간 연장에 미치는 효과를 구명하기 위해 수행하였다. 애호박의 플라스틱 봉지씌우기가 과실 수량과 과실 길이에는 크게 영향을 미치지 않았지만, 무처리에 비해 과실 무게가 가볍고 주당 과실수가 증가하였다. 이는 봉지씌우기를 함으로써 과실 비대가 제한되어 착과 수가 늘어났기 때문인 것으로 나타났다. 그리고 플라스틱 봉지씌우기는 애호박의 균일성을 높이고, 저장기간 중 과실의 감모율과 연화를 감소시켰다. 따라서 애호박의 품질을 향상시키고, 저장기간을 연장하는 수단으로 재배 중에 플라스틱 봉지씌우기가 효과적인 것을 확인할 수 있었다.

• 식물병연구
• /
• 제11권2호
• /
• pp.106-114
• /
• 2005

To breed powdery mildew resistant varieties, 104 accessions of Cucurbita spp. germplasm were evaluated. Powdery mildew resistance and horticultural characteristics of the accessions were investigated in the field conditions. C. martinezii was selected for high resistance to powdery mildew in the field. The growth of powdery mildew pathogen and response of leaf surface tissue to the pathogen were observed after artificial inoculation to resistant C martinezii and susceptible C. moschata cv. 'Wonye No.402'. Mycelium growth was very clearly different between resistant C. martinezii and susceptible C moschata cv. 'Wonye No. 402' at 5 days after inoculation at the adult stage. Interspecific hybridization was attempted to transfer powdery mildew resistance gene(s) from C. martinezii to C. moschata. A single dominant gene action was postulated as deter mining powdery mildew resistance at the seedling stage. But for the effective selection of powdery mildew resistant individuals, it was established that adult plant resistance should be confirmed in the field conditions after the seedling test. Through the seedling and field tests, C. moschata lines resistant to powdery mildew and superior to horticultural characteristics, were selected after 2 backcrossing and 3 selfing generations. The fruit characteristics of newly developed lines were similar to those of the recurrent parent, 'Jaechenjarae'.

• The Plant Pathology Journal
• /
• 제16권6호
• /
• pp.321-324
• /
• 2000

season of 2000. The disease infection usually started from flower, peduncle and young fruits, then moved to flower stalk, stem and leaves. At first, the lesions started with water-soaked, rapidly softened, and then the area gradually expanded. In severely affected film house, the rate of infected fruits reached to 28.6%. Numerous sporangiospores were formed on the diseased fruits, flower stalk, stem and leaves. Most of the sporangiospores were appeare to be rapidly dispersed in the air. The mycelia grew on the surface of host and formed stolons. Colonies on potato dextrose agar were cottony at first brownish black at maturity. Sporangia were 125.3${\times}$294.2 ${\mu}$m. globose or sub-globose with somewhat flattened base. White at first the black, many spored, and are never overhanging. Sporangiophores were 2.7-6.8${\times}$12.9-33.9 ${\mu}$m, smooth-walled, non-septate, light brown, simple, long, arising in groups of 3-5 from stolons opposite rhizoids. Sporangiophores were 8.6-21.1${\times}$6.41-1.7 ${\mu}$m, irregular, round, oval, elongate, angular and brownish-black streaked. Columella were 63.8${\times}$140.4 ${\mu}$m. brownish gray, umberella-shaped when dehisced. The causal organism was identified as Rhizopus stolonifer Lind on the basis of the morphological characteristics of the fungus. Rhizopus soft rot on squash (Cucurbita moschata) caused by the fungi has not been previously reported in Korea.

• 식물병연구
• /
• 제22권3호
• /
• pp.133-144
• /
• 2016

Powdery mildew (Podosphaera xanthii) causes severe damage to pumpkin crops grown in open fields and plastic house. Initially, we used ten accessions of pumpkin species; Cucurbita pepo (3), C. maxima (2), C. moschata (2), and C. argyrosperma (3) to study the disease progress in different stages of seedling development. Commercial pumpkin varieties were used as susceptible host for inoculum management and young seedlings were inoculated by dusting powdery mildew spores on the cotyledons, 1-true-leaf and 2-true-leaf seedling stages. Based on initial study, we further evaluated 218 pumpkinaccessions for their resistance to powdery mildew in different seedling stages under plastic house. Area under disease progress curve (AUDPC) and relative AUDPC (rAUDPC) was higher in cotyledonary and 1-true-leaf than 2-true-leaf stage. Seedlings at cotyledons and 1-true-leaf seedling stage displayed more susceptibility to powdery mildew. Based on evaluation of 2-true-leaf stage, IT 110859 and IT 278459 from C. pepo and C. argyrosperma identified as resistant (<0.2). Of the 228 pumpkin accessions, 21 (9.2%) pumpkin accessions consisting of C. pepo (2), C. maxima (5), C. moschata (13), and C. argyrosperma (1) exhibited intermediate resistance (<0.4) to powdery mildew and these accessions are useful to growers for its rational management.

• 한국식품위생안전성학회지
• /
• 제24권2호
• /
• pp.124-127
• /
• 2009

기능성 식품 소재로 주목을 받고 있는 호박종자추출물의 에스트로겐 활성을 재조합 효모를 이용하여 측정하였다. 양성대조물질로 사용된 $17{\beta}-Estradiol$은 강력한 에스트로겐 활성을 나타내었으며, 농도의존적인 반응을 나타내었다. 초임계추출법에 의하여 얻어진 호박종자추출물 분말을 에탄올로 재추출하여 시험에 사용한 결과 에스트로겐 활성이 관찰되지 않았다. 따라서 호박종자추출물이 건강기능식품 제조에 사용될 때 에스트로겐 활성으로 인한 부작용은 없을 것으로 기대된다.

• 한국식품영양학회지
• /
• 제31권1호
• /
• pp.62-69
• /
• 2018

Pumpkin (Cucurbita moschata Duch.) seed is rich in protein and sulfur-containing amino acids. Tofu is a protein gel made from soybean, which is rich in lysine but lacking in sulfur-containing amino acids. This study was conducted to investigate the use of pumpkin seeds in tofu manufacture and to determine its quality and texture characteristics. Soybean was substituted with pumpkin seed to obtain pumpkin seed tofu at the following ratios: 10%, 30%, 50%, and 70% (P10, P30, P50 and P70). Tofu manufactured only with soybean was used as a control (Con). The higher rate of pumpkin seed substitution significantly decreased the moisture content and yield rate (p<0.05). In contrast, pH value and turbidity were significantly increased with the increase in the amount of pumpkin seed (p<0.05). The L-value (81.74~79.04), a-value (-0.19~-3.89) and b-value (12.40~9.84) of samples significantly decreased with the amount of pumpkin seed (p<0.05). No significant difference in syneresis was found among the samples (p<0.05). The hardness tended to decrease with the increase in the amount of pumpkin seed. The microstructure analysis revealed that the pore size of pumpkin seed tofu was smaller than that of Con. These results suggest that the pumpkin seed protein is a useful ingredient in the manufacture of tofu. Increasing the pumpkin seed substitution levels improves the texture of tofu.

• 한국식품영양학회지
• /
• 제31권6호
• /
• pp.933-939
• /
• 2018

The objective of this study was to determine the effects of drying methods on the quality characteristics and antioxidant activities of pumpkin (Cucurbita moschata Duch.). Pumpkins were dried naturally ($25^{\circ}C$), hot-air drying ($60^{\circ}C$), and throgh freeze drying ($-40^{\circ}C$) methods. The moisture activities were highest in the freeze dried group. The soluble solid showed no significant differences among all groups. The pH was highest in the freeze dried group. The L values were increasing in freeze dried group, whereas the b values were increased in hot-air dried group. The free sugar was highest in freeze dried group. The DPPH radical scavenging activity of hot-air dried group was higher than those of the other groups. The ABTS radical scavenging activities were highest with hot-air dried group and freeze dried group. It was established that hot-air dried group is the most effective drying method for the production of high quality dried pumpkin.