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국내 멜론 흰가루병균의 race 동정 및 시판품종의 흰가루병 저항성 판별
김회택,박종인,노일섭,Kim, Hoy-taek,Park, Jong-in,Nou, Ill-sup 한국식물생명공학회 2016 식물생명공학회지 Vol.43 No.1
국내 멜론 및 박과채소 재배농가(안성, 이천, 영암, 창녕, 순천)에서 발병하고 있는 멜론 흰가루병균을 채집한 후 흰가루병균의 형태학적 특성을 이용한 종류 구분 및 멜론 race 판별계통을 이용한 국내에서 발병하고 있는 흰가루병균의 race를 확인하였다. 그 결과 국내 멜론 흰가루병균의 종류는 Podosphaera xanthii (syn. Sphaerotheca fuliginea)였으며, 기존에 보고된 race 1, N2, A와 판별결과가 일치하는 3 종류의 균주가 분리되었다. 또한 기존에 보고된 race (1, N1, N2, A, S, 5)와 검정 결과가 다른 새로운 race의 흰가루병균 2종이 동정되었다. 그리고 5개의 분리 및 동정된 흰가루병균을 이용하여 국내 시판중인 멜론 15품종에 대한 저항성을 조사한 결과, race1에 대해서는 15품종 중 9품종이 저항성을 보였다. Race N2와 A대해서는 소수의 품종에서 저항성을 보였으며, 새로운 race BN968에서는 15품종 모두가 이병성을 나타내었다. 또한 멜론 흰가루병 race 1 저항성 DNA 마커 KPMR1M-1과 KPMR1M-2에 의한 이병성 및 저항성 판별 결과와 race 1 접종 결과는 일치하였다. 따라서 국내 멜론 품종 육종에 있어서 다양한 race 특이적 마커 개발 및 이를 활용한 복합 race 저항성 품종 개발이 요구된다. Powdery mildew is an important disease of the melon (Cucumis melo L.). Seven isolates of powdery mildew fungi were collected from five locations in Korea; Anseong (DH487), Icheon (BN103, BN625, BN968), Yeongam (YA141), Changnyeong (CN582), and Suncheon (SN102). All 7 fungi had a similar trend of conidial chain and conidiophore development as Podosphaera xanthii with fibrosin bodies in mature conidia. Among them, 2 isolates of powdery mildew fungi; CN582 and SN102 showed similar responses to resistance against powdery mildew as the previously reported race 1 and race N2. The isolates YA141 and BN103 showed similar responses as like as race A. However, three isolates of powdery mildew fungi (BN625, BN968, and DH487) showed different responses compared to the previously reported races (1, N1, N2, A, S, and 5). Therefore, these three isolates could be designated as new races in melon. Nine out of 15 commercial melon cultivars in Korea showed resistance to race 1 (CN582). However, the new race BN968 invaded all 15 cultivars. Results of the two molecular markers were consistent in response to disease development by race 1 of Podosphaera xanthii in case of the above mentioned cultivars. This study confirmed the presence of new melon powdery mildew fungi in Korea which are similarly notorious as like as the previously reported race 1. Therefore, breeders can use these two molecular markers for breeding melon in Korea that is resistant to race 1 and as well as to some other races.
벼 Brassinosteroid Insensitive 1 Receptor Kinase의 기능에 관한 연구
연진욱,김회택,노일섭,오만호,Yeon, Jinouk,Kim, Hoy-Taek,Nou, Ill-Sup,Oh, Man-Ho 한국식물생명공학회 2016 식물생명공학회지 Vol.43 No.1
Brassinosteroids (BRs) are essential plant steroid hormones required for cell elongation, plant growth, development and abiotic and biotic stress tolerance. BRs are recognized by BRI1 receptor kinase that is localized in the plasma membrane, and the BRI1 protein will eventually autophosphorylate in the intracellular domain and transphosphorylate BAK1, which is a co-receptor in Arabidopsis thaliana. However, little is known of the role OsBRI1 receptor kinase plays in Oryza sativa, monocotyledonous plants, compared to that in Arabidopsis thaliana, dicotyledonous plants. As such, we have studied OsBRI1 receptor kinase in vitro and in vivo with recombinant protein and transgenic plants, whose phenotypes were also investigated. A OsBRI1 cytoplasmic domain (CD) recombinant protein was induced in BL21 (DE3) E.coli cells with IPTG, and purified to obtain OsBRI1 recombinant protein. Based on Western blot analysis with phospho-specific pTyr and pThr antibodies, OsBRI1 recombinant protein and OsBRI1-Flag protein were phosphorylated on Threonine residue(s), however, not on Tyrosine residue(s), both in vitro and in vivo. This is particularly intriguing as AtBRI1 protein was phosphorylated on both Ser/Thr and Tyr residues. Also, the OsBRI1 full-length gene was expressed in, and rescued, bri1-5 mutants, such as is seen in normal wild-type plants where AtBRI1-Flag rescues bri1-5 mutant plants. Root growth in seedlings decreased in Ws2, AtBRI1, and 3 independent OsBRI1 transgenic seedlings and had an almost complete lack of response to brassinolide in the bri1-5 mutant. In conclusion, OsBRI1, an orthologous gene of AtBRI1, can mediate normal BR signaling for plant growth and development in Arabidopsis thaliana.