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Colonization and plant growth promoting characterization of endophytic Pseudomonas chlororaphis strain Zong1 isolated from Sophora alopecuroides root nodules.

Overview of attention for article published in Brazilian Journal of Microbiology, October 2013
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Title
Colonization and plant growth promoting characterization of endophytic Pseudomonas chlororaphis strain Zong1 isolated from Sophora alopecuroides root nodules.
Published in
Brazilian Journal of Microbiology, October 2013
DOI 10.1590/s1517-83822013000200043
Pubmed ID
Authors

Zhao LF, Xu YJ, Ma ZQ, Deng ZS, Shan CJ, Wei GH

Abstract

The endophytic strain Zong1 isolated from root nodules of the legume Sophora alopecuroides was characterized by conducting physiological and biochemical tests employing gfp-marking, observing their plant growth promoting characteristics (PGPC) and detecting plant growth parameters of inoculation assays under greenhouse conditions. Results showed that strain Zong1 had an effective growth at 28 ºC after placed at 4-60 ºC for 15 min, had a wide range pH tolerance of 6.0-11.0 and salt tolerance up to 5% of NaCl. Zong1 was resistant to the following antibiotics (μg/mL): Phosphonomycin (100), Penicillin (100) and Ampicillin (100). It could grow in the medium supplemented with 1.2 mmol/L Cu, 0.1% (w/v) methylene blue and 0.1-0.2% (w/v) methyl red, respectively. Zong1 is closely related to Pseudomonas chlororaphis based on analysis the sequence of 16S rRNA gene. Its expression of the gfp gene indicated that strain Zong1 may colonize in root or root nodules and verified by microscopic observation. Furthermore, co-inoculation with Zong1 and SQ1 (Mesorhizobium sp.) showed significant effects compared to single inoculation for the following PGPC parameters: siderophore production, phosphate solubilization, organic acid production, IAA production and antifungal activity in vitro. These results suggest strains P. chlororaphi Zong1 and Mesorhizobium sp. SQ1 have better synergistic or addictive effect. It was noteworthy that each growth index of co-inoculated Zong1+SQ1 in growth assays under greenhouse conditions is higher than those of single inoculation, and showed a significant difference (p < 0.05) when compared to a negative control. Therefore, as an endophyte P. chlororaphis Zong1 may play important roles as a potential plant-growth promoting agent.

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Geographical breakdown

Country Count As %
United States 2 4%
Austria 1 2%
France 1 2%
United Kingdom 1 2%
Australia 1 2%
Unknown 48 89%

Demographic breakdown

Readers by professional status Count As %
Student > Master 12 22%
Researcher 9 17%
Student > Ph. D. Student 8 15%
Student > Doctoral Student 5 9%
Lecturer 3 6%
Other 10 19%
Unknown 7 13%
Readers by discipline Count As %
Agricultural and Biological Sciences 25 46%
Biochemistry, Genetics and Molecular Biology 6 11%
Environmental Science 3 6%
Computer Science 3 6%
Immunology and Microbiology 2 4%
Other 7 13%
Unknown 8 15%