• Title/Summary/Keyword: infected plant

Search Result 1,313, Processing Time 0.021 seconds

Generation of Transgenic Rice without Antibiotic Selection Marker through Agrobacterium-mediated Co-transformation System (아그로박테리움 동시 형질전환 시스템을 통한 항생제 선발 마커가 없는 형질전환벼의 생산)

  • Park, Soo-Kwon;Kwon, Tack-Min;Lee, Jong-Hee;Shin, Dong-Jin;Hwang, Woon-Ha;Song, You-Chun;Cho, Jun-Hyun;Nam, Min-Hee;Jeon, Seung-Ho;Lee, Sang-Yeol;Park, Dong-Soo
    • Journal of Life Science
    • /
    • v.22 no.9
    • /
    • pp.1152-1158
    • /
    • 2012
  • Development of transgenic plant increasing crop yield or disease resistance is good way to solve the world food shortage. However, the persistence of marker genes in crops leads to serious public concerns about the safety of transgenic crops. In the present paper, we developed marker-free transgenic rice inserted high molecular-weight glutenin subunit (HMW-GS) gene ($D{\times}5$) from the Korean wheat cultivar 'Jokyeong' using Agrobacterium-mediated co-transformation method. Two expression cassettes comprised of separate DNA fragments containing only the $D{\times}5$ and hygromycin resistance (HPTII) genes were introduced separately into Agrobacterium tumefaciens EHA105 strain for co-infection. Each EHA105 strain harboring $D{\times}5$ or HPTII was infected into rice calli at a 3: 1 ratio of EHA105 with $D{\times}5$ gene and EHA105 with HPTII gene expressing cassette. Then, among 66 hygromycin-resistant transformants, we obtained two transgenic lines inserted with both the $D{\times}5$ and HPTII genes into the rice genome. We reconfirmed integration of the $D{\times}5$ and HPTII genes into the rice genome by Southern blot analysis. Wheat $D{\times}5$ transcripts in $T_1$ rice seeds were examined with semi-quantitative RT-PCR. Finally, the marker-free plants containing only the $D{\times}5$ gene were successfully screened at the $T_1$ generation. These results show that a co-infection system with two expression cassettes could be an efficient strategy to generate marker-free transgenic rice plants.

New Technologies for the Removal of Bacteriophages Contaminating Whey and Whey Products as Cheese by-Products: A Review (치즈 부산물인 유청과 유청 제품에 감염된 박테리오파지 제거를 위해 새롭게 개발된 기술: 총설)

  • Kim, Dong-Hyeon;Chon, Jung-Whan;Kim, Hyun-Sook;Kim, Hong-Seok;Song, Kwang-Young;Hwang, Dae-Geun;Yim, Jin-Hyuk;Kang, Il-Byung;Lee, Soo-Kyung;Seo, Kun-Ho
    • Journal of Dairy Science and Biotechnology
    • /
    • v.32 no.2
    • /
    • pp.93-100
    • /
    • 2014
  • In general, whey obtained from various cheese batches is being reused, so as to improve the texture and to increase the yield and the nutrient value of the various final milk-based products. In fact, re-usage of whey proteins, including whey cream, is a common and routine procedure. Unfortunately, most bacteriophages can survive heat treatments such as pasteurization. Hence, there is a high risk of an increase in the bacteriophage population during the cheese-making process. Whey samples contaminated with bacteriophages can cause serious problems in the cheese industry. In particular, the process of whey separation frequently leads to aerosol-borne bacteriophages and thus to a contaminated environment in the dairy production plant. In addition, whey proteins and whey cream reused in a cheese matrix can be infected by bacteriophages with thermal resistance. Therefore, to completely abolish the various risks of fermentation failure during re-usage of whey, a whey treatment that effectively decreases the bacteriophage population is urgently needed and indispensable. Hence, the purpose of this review is to introduce various newly developed methods and state-of-the-art technologies for removing bacteriophages from contaminated whey and whey products.

  • PDF

Effects of a Soil-Born Paenibacillus spp. Strain KPB3 on Suppression of Bacterial Wilt Disease Caused by Ralstonia solanacearum (토양에서 분리한 Paenibacillus spp. KPB3의 Ralstonia solanacearum에 의한 세균성 풋마름병 억제 효과)

  • Suk, Jung-Ki;Ipper, Nagesh S.;Lee, Seon-Hwa;Shrestha, Anupama;Park, Duck-Hwan;Cho, Jun-Mo;Hur, Jang-Hyun;Kim, Byung-Sup;Lim, Chun-Keun
    • The Korean Journal of Pesticide Science
    • /
    • v.10 no.4
    • /
    • pp.313-319
    • /
    • 2006
  • Two hundred bacterial strains were isolated from the soil around healthy tomato plants in a polyvinyl house, where most of the other plants showed bacterial wilt symptoms. The strains were screened in vitro for their antibacterial activity. Among them, a strain, KPB3 showed strong bactericidal activity against bacterial wilt pathogen, Ralstonia solanacearum. The strain KPB3 was identified using physiological and biochemical tests, and 16S rRNA analyses. Based on these tests, the strain was found to be closer to genus Paenibacillus. To control the bacterial wilt caused by R. solanacearum, greenhouse experiments were conducted to determine the effectiveness of the Paenibacillus strain KPB3. Drench application of this strain ($4{\times}10^8$ CFU $mL^{-1}$) into the pots containing tomato plants, post-inoculated with the pathogen, R. solanacearum could drastically reduce the disease severity, compared to the non-treated plants. To evaluate effectiveness of this strain under field conditions, experiments were carried out in polyvinyl houses infested with R. solanacearum, during spring and autumn of the year 2006. It was observed that, during spring, bacterial wilt was more prevalent compared to the autumn. During spring, 50.9% disease incidences occurred in non-treated controls, while, Paenibacillus strain KPB3 treated plants showed 24.6% disease incidences. Similarly, during autumn, around 17.2% plants were infected with bacterial wilt in non- treated polyvinyl houses, compared to the Paenibacillus strain KPB3 treated plants, which showed 7.0% disease incidences. These results demonstrated that, Paenibacillus strain KPB3 is a potential biological control agent against bacterial wilt caused by R. solanacearum, effective under greenhouse as well as field conditions. This is the first report showing biocontrol of R. solanacearum using a Paenibacillus spp. under field conditions.