• Journal of the Korean Society of Food Science and Nutrition
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• v.37 no.1
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• pp.117-123
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• 2008

The protein profiles of domestic potato cultivars were evaluated for total protein determination, amino acid composition, SDS-PAGE analysis and scanning densitometry. There were statistically significant differences in the levels of amino acids among potato cultivars. Total nitrogen amount was also significantly different among cultivars, ranging from 1.27 to 1.64%. SDS-PAGE analysis showed that there were significant differences in the content of major potato proteins such as papatin (40 kDa), trypsin inhibitor (20 kDa) and protease inhibitor (15 kDa) among cultivars (p<0.05). The amount of papatin among cultivars with a range of 22.16 to 25.81 mg/g d.w. was higher in Jopung, Shepody and Superior, whereas the amount of protease inhibitors including 15 kDa and 20 kDa was the highest in Jopung (37.0%). The Shepody contains the highest amount of papatin (25.8%) and the lowest of trypsin inhibitor (5.22%). Thus, it is suggested that Shepody is the most desirable cultivar for better nutrition based on the protein profile.

• Journal of the Korean Society of Food Science and Nutrition
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• v.40 no.1
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• pp.37-46
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• 2011

Polyphenolic content and antimutagenicity of the methanol extracts prepared from 22 cultivars of sweet potato with different flesh colors were investigated using Folin-Ciocalteu's phenol reagent method and Ames test, respectively. There was a remarkable cultivar difference in the polyphenolic content of sweet potato. Su, Hayanmi and Shinhwangmi among 17 cultivars of non-purple sweet potato had higher polyphenolic contents of 21.4, 21.5 and $20.3{\mu}g$ (GAE/g dried sweet potato), respectively, whereas Manami and Yeonhwangmi were very much lower at 4.6 and $4.8{\mu}g$. Mokpo No.62, Borami, Sinjami, Jami and Ayamurasaki had much higher polyphenolic contents of 67.7, 76.9, 44.9, 128.3 and $93.2{\mu}g$, respectively, than non-purple sweet potato. The methanol extract from the sweet potato effectively inhibited the reverse mutation induced by 1-NP, daunomycin, Trp-P-1, Trp-P-2 and 2-AA on S. Typhimurium TA 98, and by 1-NP on S. Typhimurium TA 100. These results suggest that the antimutagencity properties may be influenced by the tested mutagen and strain rather than the polyphenolic content of non-purple and purple sweet potato. However, in the purple sweet potatoes, a high polyphenolic content may influence the antimutagencity properties.

• Korean Journal of Food Science and Technology
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• v.49 no.4
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• pp.360-368
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• 2017

The objective of this research was to elucidate the physicochemical, structural, pasting and rheological properties of potato starch isolated from a foreign potato cultivar ('Atlantic') and new domestic potato cultivars ('Goun', 'Sebong', and 'Jinsun'). Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and one-dimensional nuclear magnetic resonance (1D NMR) showed that the structural properties of potato starch did not vary significantly with cultivars. RVA analysis demonstrated that the 'Atlantic' starch had the highest breakdown viscosity among all potato starches. In steady shear rheological analysis, all potato starch dispersions showed shear-thinning behaviors (n =0.63-0.72) at $25^{\circ}C$. The highest apparent viscosity (${\eta}_{a,5}$), consistency index (K), and yield stress (${\sigma}_{oc}$) were observed in the 'Goun' starch dispersion. In dynamic shear rheological analysis, storage modulus (G') and loss modulus (G") values of new domestic potato starch dispersions were higher than those of the 'Atlantic' starch dispersion.

• Korean Journal Plant Pathology
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• v.14 no.6
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• pp.571-577
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• 1998

Variability in virulence of Calonectria ilicicola isolates form different hosts and geographic origin provides important information for breeding cultivars resistant to red crown rot. A wide range in virulence for 25 isolates of C. ilicicola from soybean and peanut was observed on six soybean cultivars. Soybean isolates were pathogenic on soybean although some were less virulent. Virulence of isolates was not affected greatly by cultivar and relatively consistent regardless of virulence level. Soybean isolates were more virulent on soybean than were peanut isolates. When virulence of two soybean and tow peanut isolates was compared between laboratory and greenhouse tests, it was stable across a range of cultivars. Mycelial growth of isolates from either soybean or peanut was reduced significantly on potato dextrose chlorate showed significant reduction of fungal growth than isolates from peanut did although their growth on potato dextrose agar was not significantly different. Evidence for physiologic specialization was not recognized in this system. However, the findings that soybean isolates of C. ilicicola were more virulent on soybean and reduction of fungal growth on potato dextrose chlorate than were peanut isolates suggest that host specialization may exist in this fugus.

• Korean Journal of Food Science and Technology
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• v.17 no.6
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• pp.421-425
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• 1985

The changes of pectic substances during baking at $175{\sim}180^{\circ}C$ for 30 minutes and polygalacturonase activities of three sweet potato cultivars on textural properties were investigated. The three different types of sweet potato cultivars were the dry type (Wonki), the intermediate type (Shinmi), and the moist type (Chunmi). The moisture content, alcohol insoluble solid content, composition of pectic substances and hardness were determined before and after baking. It was found that HCl-soluble pectin was significantly changed into water soluble and sodium hexametaphosphate soluble pectin by baking. The dry type, Wonki showed the lowest moisture content, but the highest alcohol insoluble solid content and hardness. Wonki, whose polygalacturonase activity was the highest, had the highest HCl-soluble pectin content after backing.

• The Plant Pathology Journal
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• v.27 no.1
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• pp.14-19
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• 2011

Early blight of potato, caused by Alternaria solani, is a ubiquitous disease in many countries around the world. Our previous screening of several Iranian potato cultivars found that significant variation in resistance phenotypes exists between two cultivars: resistant 'Diamond' and susceptible 'Granula'. Our previous analysis of five different pathogen isolates also identified varying degrees of aggressiveness regardless of the host cultivar. Here, a bioassay was used to study the role of liquid culture exudates produced in vitro on pathogenicity and elicitation of disease symptomology in seedlings as well as detached leaves. Responses of host genotypes to the exudates of the two A. solani isolates were significantly different. Detached leaves of the resistant cultivar 'Diamond' elicited fewer symptoms to each isolate when compared to the susceptible cultivar 'Granula'. Interestingly, the phytotoxicity effect of the culture filtrate from the more aggressive isolate A was higher than from isolate N suggesting an increased concentration or strength of the toxins produced. Our results are significant because they indicate a correlation between symptoms elicited by A. solani phytotoxins and their aggressiveness on the host.

• Korean Journal of Environmental Agriculture
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• v.33 no.4
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• pp.321-326
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• 2014

BACKGROUND: Recently, weather disasters such as hail and typhoon occur frequently. These threaten the stable cultivation of potatoes. It is very important to cultivate potatoes with stable under unexpected weather disasters. This study was performed to investigate the correlation between mophological characteristics of potato stem and its resistance to hail damage in different potato cultivars. METHODS AND RESULTS: Hail fall occurred for 8 minutes on May 31, 2012 in the field of Highland Agriculture Research Center located in Jinbu-myeon Gangwon-do. Potato crop grown in the field was affected by hail due to which the stems of potato were broken. The percentage of broken stem of potato was investigated as the level of damage by hail. To determine the difference in the ratio of broken stem among the potato cultivars, physical characteristics of potato stem such as diameter and hardness were measured. To evaluate recovery phase after hail damage, ground coverage and yield were measured. The percentage of broken stem of cv. Goun and cv. Saebong were 30%, 26%, respectively, whereas it was 5% in the cv. Atlantic. Damage by hail was the lowest in cv. Atlantic. Diameter of the stem was 15 mm in cv. Atlantic, 13 mm in cv. Goun and 11 mm in cv. Saebong. The hardness of potato cultivars was measured which was 74 N in cv. Atlantic. 71 N in cv. Goun and 59 N in cv. Saebong. The ground coverage in cv. Atlantic was 79%, which was the highest followed by 73% in cv. Saebong and 56% in cv. Goun. The yield of cv. Atlantic was monitored at 90 days after planting which was 40 MT/ha and that of cv. Saebong was 36 MT/ha, whereas in cv. Goun, it was 30 MT/ha which was the lowest. CONCLUSION: The ratio of broken stem in cv. Atlantic was the lowest compared to cultivars. In the physical characteristics of stem, cv. Atlantic was the highest in value of diameter and hardness. Based on these results, it was considered that cv. Atlantic was resistant to hail damage compared to other cultivars.

• Journal of Plant Biotechnology
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• v.42 no.2
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• pp.129-134
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• 2015

In order to compare salt tolerance among potato cultivars (Solanum tuberosum L.), in vitro plants of each cultivar were cultured on the Murashige and Skoog's medium containing different levels of NaCl (0, 75, 150, and 225 mM). The suitable level of NaCl for a comparison of the shoot and root growth between potato cultivars was 75mM. Shoot length and weight were better in 'Dejima', 'Superior', 'Jayoung', and 'Haryeong' than in other cultivars such as 'Goun' and 'Atlantic'. Normal root growth was observed in 'Seohong', 'Superior', and 'Haryeong', while 'Goun', 'Atlantic', 'Dejima', 'Jowon', and 'Chuback' showed no root. Proline contents in all the cultivars increased as affected by NaCl levels, then the increase amount was fewer in the cultivars showed a better growth in both shoot and root than in others showed a poor growth. As a result of this study, 'Superior' and 'Haryeong' were determined as salt tolerant cultivars and therefore using these cultivars it would be possible to potato production at salt arable land such as reclaimed tidal.

• Korean journal of food and cookery science
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• v.33 no.1
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• pp.78-86
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• 2017

Purpose: To increase the availability of Korean sweet potato (SP), the quality characteristics of the sweet potato pastes (SPPs) and rice madeira cake (RMC) using them were investigated. Methods: Ten different SPPs, orange fleshed Sinwhangmi, Juwhangmi, purple fleshed Sinjami and Yeonjami, Cream fleshed Sinyulmi, Sinchunmi, and newly developed Geonwhangmi, Dahomi, Daeyumi, and Pongwonmi were used. Their pastes were prepared by washed, peeled, steamed, crushed, vacuum packed and stored in a freezer until use. Results: The SPPs and RMC with them were significant difference from different cultivars with color value, rheology and texture properties, and preference test. The SPP showed the highest lightness value in Sinchunmi (55.89) and the highest viscosity in Geonhwangmi (55.33 poise). The RMCs with SPPs had lower values in hardness and chewiness than the RMC without SPP. Overall quality of preference test showed the highest values in RMC with Sinyulmi and Sincheonmi. Conclusion: The best quality of sweet potato shaped rice madeira cake was made using Sinyulmi and Sinchunmi pastes. It is suggested that sweet potato paste is possible to use as the biomaterials for application of processed foods.

• The Korean Journal of Community Living Science
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• v.28 no.1
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• pp.59-68
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• 2017

In this study, two kinds of chestnut-sweet potato (CSP) and pumpkin-sweet potato (PSP) were cooked by three methods: raw, steaming, and roasting. These samples were investigated in food compositions such as moisture, protein, ash, dietary fiber, fat, minerals, and vitamins. As the results of this study, the moisture contents of raw CSP and raw PSP were higher than those of steamed and roasted samples in two cultivars. The contents of protein in raw CSP and raw PSP were 2.57 g/100 g and 3.22 g/100 g, respectively, which were higher than those of other cultivars. The protein contents of roasted CSP and steamed PSP were lower than those of their raw samples. The potassium, phosphorus, magnesium, calcium, sodium, and iron values of PSP were 1,048.46 mg/100g, 152.02 mg/100g, 74.70 mg/100g, 57.22 mg/100g, 22.28 mg/100g, and 1.44 mg/100g, respectively, which were the highest values in tested sweet potato cultivars. The content of dietary fiber in CSP was higher generally than that in PSP. The values of total dietary fiber in cooked sweet potatoes were higher than those of raw sweet potatoes. The contents of vitamins, including thiamine, riboflavin, and niacin, in PSP were higher than those in CSP. Overall, two cultivars of raw, boiled, and roasted sweet potatoes had enhanced food composition. Therefore, these sweet potato cultivars are expected to be highly valuable food items for the development and application of functional foods.