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Gyeryeong Bak,Jeong-Tae Lee 한국토양비료학회 2021 한국토양비료학회지 Vol.54 No.1
The importance of soil quality has been emphasized to improve crop productivity and quality. Many factors not only chemical, physical, and biological properties but also managements affect soil quality. The use of a cropping system could influence soil and crop qualities. In this study, two cropping systems-continuous and rotation with napa cabbage (Brassica campestris var. Pekinensis) and soybean (Glycine max L.) were compared on soil characteristics and potato (Solanum tuberosum L.) productivities. Chemical, physical, and biological properties were analyzed considering soil characteristics while potato yield and tuber nutrition were investigated to evaluate potato productivity and quality. Total yield was higher in the rotation despite lower input. There was no significance with soil chemical properties and porosity. Soil hardness data were higher value i n rotation to the 25 ㎝ depth but the tendency was reversed to the 45 ㎝ depth. Soil microorganism activities showed a higher value on rotation during potato cultivation. Phosphate was higher in rotation while magnesium and potassium were higher in continuous inside potato tuber.
고랭지 농업에서 알팔파 재배가 토양유실 및 옥수수 생산에 미치는 영향
백계령,이정태,Bak, Gyeryeong,Lee, Jeong-Tae 한국환경과학회 2021 한국환경과학회지 Vol.30 No.2
Soil conservation management is necessary for sustainable agriculture, in highland areas, and cover crops are one of the best soil conservation methods for slopes. In this study, we evaluated the effects of alfalfa cultivation on maize production, as well as soil conservation and quality. There was an outstanding soil conservation effect with alfalfa cultivation in the fallow and maize growing seasons. In particular, alfalfa cultivation reduced soil loss by up to 98% compared with bare field. It also increased the activities of soil microorganisms and the supply of organic matter. Maize production with alfalfa cultivation showed no significant differences in yield. In conclusion, alfalfa is an advantageous perennial cover crop in highland agricultural slope areas, which can have positive effects on soil quality and conservation, as well as maize production.
건조스트레스가 감자 식물체 무기성분 및 생육에 미치는 영향
백계령,이계준,조지홍,Bak, Gyeryeong,Lee, Gyejun,Cho, Jihong 한국작물학회 2017 한국작물학회지 Vol.62 No.3
Yield of potato is largely influenced by drought stress. This study was conducted in Gangneung and Cheongju during the spring cropping of potato. Potatoes in the Gangneung area were affected by drought but there was no damage due to drought in Cheongju. During the early-growth stage, the contents of inorganic components like available phosphate and growth characteristics of the potato leaf in Cheongju were significantly higher than those in Gangneung but there was no difference after the flowering stage. It was considered that the potato plants cultivated in Cheongju could vigorously grow than that of Gangneung under drought stress. In addition, the content of calcium (Ca), which is a secondary messenger related to aging, was found to be higher in potato plants grown in Cheongju than in Gangneung and accumulated more quickly in potato plants of Cheongju. Because magnesium (Mg) was also found to be higher in potato plants from Gangneung by a wide margin, this phenomenon was thought be related with drought stress. The amounts of all inorganic components absorbed from soil were higher in Cheongju than in Gangneung, showing a relatively higher plant biomass in Cheongju. Correlations of development indexes related to leaf showed less or no relation in Gangneung. According to yield characteristics of the harvest stage, although yield was greatly reduced under drought stress condition, the rate of commercial yield was not significantly affected under the drought stress condition. Consequently, it was considered that these responses to drought stress could be utilized to stabilize potato production under the stressful conditions associated with abnormal climate.
Samnyu Jee,In-Jeong Kang,Gyeryeong Bak,Sera Kang,Jeongtae Lee,Sunggi Heu,Ingyu Hwang 한국식물병리학회 2022 Plant Pathology Journal Vol.38 No.1
In this study, we conducted whole-genome sequenc- ing with six species of Pectobacterium composed of seven strains, JR1.1, BP201601.1, JK2.1, HNP201719, MYP201603, PZ1, and HC, for the analysis of patho- genic factors associated with the genome of Pectobac- terium. The genome sizes ranged from 4,724,337 bp to 5,208,618 bp, with the GC content ranging from 50.4% to 52.3%. The average nucleotide identity was 98% among the two Pectobacterium species and ranged from 88% to 96% among the remaining six species. A similar distribution was observed in the carbohydrate-active enzymes (CAZymes) class and extracellular plant cell wall degrading enzymes (PCWDEs). HC showed the highest number of enzymes in CAZymes and the low- est number in the extracellular PCWDEs. Six strains showed four subsets, and HC demonstrated three sub- sets, except hasDEF, in type I secretion system, while the type II secretion system of the seven strains was conserved. Components of human pathogens, such as Salmonella pathogenicity island 1 type type III secretion system (T3SS) and effectors, were identified in PZ1; T3SSa was not identified in HC. Two putative effectors, including hrpK, were identified in seven strains along with dspEF. We also identified 13 structural genes, six regulator genes, and five accessory genes in the type VI secretion system (T6SS) gene cluster of six Pectobacteri- um species, along with the loss of T6SS in PZ1. HC had two subsets, and JK2.1 had three subsets of T6SS. With the GxSxG motif, the phospholipase A gene did locate among tssID and duf4123 genes in the T6SSa cluster of all strains. Important domains were identified in the vgrG/paar islands, including duf4123, duf2235, vrr-nuc, and duf3396.