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Puccinia sp.에 의한 이팝나무 잎녹병 발생 및 중간기주 보고
유난희(Nan Hee Yu),박애란(Ae Ran Park),윤혁준(Hyeokjun Yoon),손연경(Youn Kyoung Son),이병희(Byoung-Hee Lee),김진철(Jin-Cheol Kim) 한국식물병리학회 2020 식물병연구 Vol.26 No.3
2018년 7월 전라남도 강진군의 가로수 전체 이팝나무에 심각한 녹병증상이 발견되어 잎을 채집하였다. 채집한 이팝나무 잎앞면에서 황색 및 갈색의 병반과 잎 뒷면에서 황색의 녹포자기가 관찰되었고, 현미경아래에서 41.2 μm 크기의 구형 녹포자와28.84 μm 크기의 구형 하포자가 확인되었다. 이팝나무 녹병균의 부분 small subunit rRNA, internal transcribed spacer (ITS) 1, 5.8S rRNA, ITS2, 부분 large subunit rRNA 염기서열을 이용하여 계통학적 유연관계를 분석한 결과, 대나무 녹병균으로 보고되어져 있는 Puccinia kusanoi와 가까운 근연관계를 가지고 있었다. 또한 2019년 5월 무위사로 이팝나무 주변에 식재된 대나무에서도 녹병 병징이 관찰되었고, 잎 뒷면에서 동포자퇴와 동포자를 확인하였으며, 대나무에서 채집한 동포자의 염기서열분석 결과, 이팝나무 녹병균과 100% 일치하였다. 본 논문은 대나무 녹병균으로 알려진 P. kusanoi와 근연관계가 가까운 새로운 종 Puccinia sp. JCK-KCFR1 strain (MT729824)가 국내에서 이팝나무와 대나무를 기주교대하며 녹병을 발생시키는 것을 처음으로 보고한다. In July 2018, a serious rust symptom was found throughout the fringe trees planted in Gangjin-gun, Korea. Yellow and brown spots were observed on the adaxial (topside) surface of the collected fringe tree leaves, and yellow color aecia were observed on the abaxial (underside) surface leaves. The size of aeciospore and urediniospores of JCK-KCFR1 strain were measured to 41.2 μm (Φ) and 28.84 μm (Φ) with a light microscope. Phylogenetic analysis of the small subunit rRNA, internal transcribed spacer, and large subunit rRNA region indicated that JCK-KCFR1 strain is novel species of the genus Puccinia and closely related to Puccinia kusanoi, which has been reported a rust pathogen on bamboo. In May 2019, rust symptoms were also discovered on the bamboo leaves planted around the fringe tree on Muwisa-ro, and their telia and teliospores were observed on the abaxial leaf surfaces of the bamboo with 100% sequence homology with the rust of the fringe tree. This is the first report that Puccinia sp. JCK-KCFR1 is a new species that requires both primary (fringe tree) and alternative (bamboo) host plants to complete its life cycle in Korea.
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Viet-Cuong Han,유난희(Nan Hee Yu),윤혁준(Hyeokjun Yoon),안능호(Neung-Ho Ahn),Youn Kyoung Son,Byoung-Hee Lee,김진철(Jin-Cheol Kim) 한국식물병리학회 2022 Plant Pathology Journal Vol.38 No.2
Though information exists regarding the pathogenesis of the shot-hole disease (SH) in flowering cherry (FC), there has been a lack of research focusing on SH management. Therefore, here, we investigated the inhibitory activities of antagonistic bacteria against SH pathogens both in vitro and in vivo as well as their biochemical characteristics and bioactive compounds. Two biosurfactant- producing bacterial antagonists, identified as Bacillus velezensis strains JCK-1618 and JCK-1696, exhibited the best effects against the growth of both bacterial and fungal SH pathogens in vitro through their cell-free culture filtrates (CFCFs). These two strains also strongly inhibited the growth of the pathogens via the action of their antimicrobial diffusible compounds and antimicrobial volatile organic compounds (VOCs). Crude enzymes, solvent extracts, and biosurfactants of the two strains exhibited antimicrobial activities. Liquid chromatography/electrospray ionization timeof- flight mass spectrometric analysis of the partially purified active fractions revealed that the two antagonists produced three cyclic lipopeptides, including iturin A, fengycin A, and surfactin, and a polyketide, oxydifficidin. In a detached leaf assay, pre-treatment and co-treatment of FC leaves with the CFCFs led to a large reduction in the severity of the leaf spots caused by Epicoccum tobaicum and Bukholderia contaminans, respectively. In addition, the two antagonists produced indole-3-acetic acid, siderophore, and a series of hydrolytic enzymes, along with the formation of a substantial biofilm. To our knowledge, this is the first report of the antimicrobial activities of the diffusible compounds and VOCs of B. velezensis against the SH pathogens and their efficiency in the biocontrol of SH.
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신재성 ( Jae Sung Shin ),유난희 ( Nan Hee Yu ),강희곤 ( Hee Gon Kang ),신현탁 ( Hyun Tak Shin ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2011 한국환경복원기술학회지 Vol.14 No.2
This study monitored forest plant species vulnerable to climate change in Jiri Mountain, one of Korea`s representative alpine regions, in order to securely preserve plant genetic resources susceptible to climate change and to utilize the results as basic data for bioclimatology prediction and management on a long-term basis. A majority of indicator plants tended to blossom one week to one month later in 2010 than in 2009. As with the blooming dates, the falling dates of blossoms became later in most species, with the exception for Weigela florida and Oplopanax elatus. Leaf bursting as well fell on later dates in a majority of species excluding Carpinus laxiflora and Cupressus sempervirens, displaying the most obvious differences among the data of analysis of the 2009-2010 physiological cycle changes. It is believed that was due to the fact that temperatures in February, March and April, which affect plants` blossoming and leaf bursting, were lower in 2010 than in 2009 and that cold temperatures in the winter lasted for a longer period in 2010 than in 2009. The dates of leaves being changed to red were similar in 2009 and 2010 by being or later or earlier by several weeks in 2010 than in 2009 without any regularity. Most species` leaves began to fall at similar dates in 2009 and 2010 or at later dates by one to two weeks in 2010 than in 2009. The temperature differences in late 2009 and late 2010 were not so large, resulting in similar dates of falling leaves, and gaps in several indicator plants` physiological cycles without any regularity can be attributed to each individual plant`s physiological and environmental characteristics.
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