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Guoliang Li,Shifan Zhang,Fei Li,Hui Zhang,Shujiang Zhang,Jianjun Zhao,Rifei Sun 한국식물병리학회 2021 Plant Pathology Journal Vol.37 No.1
Plants protect against viruses through passive and ac- tive resistance mechanisms, and in most cases charac- terized thus far, natural recessive resistance to potyvi- ruses has been mapped to mutations in the eukaryotic initiation factor eIF4E or eIF(iso)4E genes. Five eIF4E copies and three eIF(iso)4E copies were detected in Brassica rapa. The eIF4E and eIF(iso)4E genes could interact with turnip mosaic virus (TuMV) viral protein linked to the genome (VPg) to initiate virus translation. From the yeast two-hybrid system (Y2H) and bimo- lecular fluorescence complementation (BiFC) assays, the TuMV-CHN2/CHN3 VPgs could not interact with BraA.eIF4E.a/c or BraA.eIF(iso)4E.c, but they could interact with BraA.eIF(iso)4E.a in B. rapa. Further analysis indicated that the amino acid substitution L186F (nt T556C) in TuMV-UK1 VPg was important for the interaction networks between the TuMV VPg and eIF(iso)4E proteins. An interaction model of the BraA. eIF(iso)4E protein with TuMV VPg was constructed to infer the effect of the significant amino acids on the interaction of TuMV VPgs-eIF(iso)4Es, particularly whether the L186F in TuMV-UK1 VPg could change the structure of the TuMV-UK1 VPg protein, which may terminate the interaction of the BraA.eIF(iso)4E and TuMV VPg protein. This study provides new insights into the interactions between plant viruses and trans- lation initiation factors to reveal the working of key amino acids.
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Li, Shujiang,Fang, Xinmei,Zhang, Hanlian,Zeng, Yanling,Zhu, Tianhui The Korean Society of Plant Pathology 2019 Plant Pathology Journal Vol.35 No.3
Thirty-four strains of bacteria were isolated from Phellodendron amurense. Using Nectria haematococca as an indicator strain, the best strain, B18, was obtained by the growth rate method. The morphological, physiological and biochemical characteristics of strain B18 and its 16S DNA gene sequence were identified, and the biocontrol effect of strain B18 was assessed in pot and field tests, as well as in a field-control test. Drilling methods were used to determine the antibacterial activity of metabolites from strain B18 and their effects on the growth of pathogen mycelia and spores. The best bacteriostatic rate was 85.4%. B18 can hydrolyse starch and oxidize glucose but does not produce gas; a positive result was obtained in a gelatine liquefaction test. According to 16S DNA gene sequencing, strain B18 is Bacillus methylotrophicus (GenBank accession number: MG457759). The results of pot and field-control trials showed 98% disease control when inoculating $10^8cfu/ml$ of the strain. The disease control effect of the B18 culture liquid (concentrations of $10^8$, $2{\times}10^6$, $10^6$, $5{\times}10^5$ and $2.5{\times}10^5cfu/ml$) in the field-control test was higher than 80%, and the cure rate of the original delivery solution was 96%. Therefore, in the practical forestry production, a $2.5{\times}10^5cfu/ml$ culture liquidshould be applied in advance to achieve good control effects.
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Zhi-Hui Zhang,Shujiang Li,Hua Yan 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.4
This paper studies the output feedback controller design problem for a class of interconnected systemswith uncertain interconnections. First, the interval observers are built to guarantee the interval property betweenthe system states and their estimations. Then, the state feedback controller is designed for each observer systemother than output feedback controller for original system. A cyclic-small-gain condition is used to deal with thebound functions of the uncertain interconnections. The original closed-loop system is robust stable since that theinterval properties are satisfied. The non-convex conditions caused by traditional observer-based output feedbackare avoided by transforming the output to state feedback problem. Finally, the main results are demonstrated bynumerical simulations.
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