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- 발행기관 : GUSTAV FISCHER VERLAG JENA GMBH (검색결과 2 건)
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Durairaj, Kaliannan,Velmurugan, Palanivel,Park, Jung-Hee,Chang, Woo-Suk,Park, Yool-Jin,Senthilkumar, Palaninaicker,Choi, Kyung-Min,Lee, Jeong-Ho,Oh, Byung-Taek GUSTAV FISCHER VERLAG JENA GMBH 2018 MICROBIOLOGICAL RESEARCH Vol.206 No.-
<P><B>Abstract</B></P> <P> <I>Pseudomonas</I> and <I>Bacillus</I> species are attractive due to their potential bio-control application against plant bacterial pathogens<I>. Pseudomonas aeruginosa</I> strain D4 and <I>Bacillus stratosphericus</I> strain FW3 were isolated from mine tailings in South Korea. In these potent bacterial strains, we observed improved antagonistic activity against <I>Pseudomonas syringae</I> DC3000. These strains produced biocatalysts for plant growth promotion, and <I>in vivo</I> examination of <I>Solanum lycopersicum</I> included analysis of disease severity, ion leakage, chlorophyll content, and H<SUB>2</SUB>O<SUB>2</SUB> detection. In addition, regulation of the defense genes pathogen-related protein 1a (PR1a) and phenylalanine ammonia lyase (PAL) was compared with treated plants and untreated control plants. The results suggest that these two bacterial strains provide protection against plant pathogens via direct and indirect modes of action and could be used as a bio-control agent.</P>
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Asaf, S.,Khan, A.L.,Khan, M.A.,Imran, Q.M.,Yun, B.W.,Lee, I.J. GUSTAV FISCHER VERLAG JENA GMBH 2017 MICROBIOLOGICAL RESEARCH Vol.205 No.-
<P>Osmotic stress induced by drought can hinder the growth and yield of crop plants. To understand the eco-physiological role of osmoprotectants, the combined utilization of endophytes and osmolytes (trehalose) can be an ideal strategy used to overcome the adverse effects of drought. Hence, in the present study, we aimed to investigate the role of Sphingomonas sp. LK11, which produces phytohormones and synthesizes trehalose, in improving soybean plant growth under drought-induced osmotic stress (-0.4, -0.9, and -1:2 MPa). The results showed that the inoculation of soybean plants with Sphingomonas sp. LK11 significantly increased plant length, dry biomass, photosynthetic pigments, glutathione, amino acids (proline, glycine, and glutamate), and primary sugars as compared to control plants under varying drought stresses. Trehalose applied to the plant with or without endophyte-inoculation also showed similar plant growth-promoting attributes under stress. Stress exposure significantly enhanced endogenous jasmonic (JA) and abscisic (ABA) acid contents in control plants. In contrast, Sphingomonas sp. LK11-inoculation significantly lowered ABA and JA levels in soybean plants, but these phytohormones increased in response to combined treatments during stress. The drought-induced osmotic stress resistance associated with Sphingomonas sp. LK11 and trehalose was also evidenced by increased mRNA gene expression of soybean dehydration responsive element binding protein (DREB)-type transcription factors (GmDREBa and GmDREB2) and the MYB (myeloblastosis) transcription factor (GmMYBJ1) as compared to the control. In conclusion, our findings demonstrated that inoculation with this endophyte and trehalose improved the negative effects of drought-induced osmotic stress, and it enhanced soybean plant growth and tolerance.</P>
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