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RISS 인기검색어
- 검색키워드
- 저자 : Zou Changsong (검색결과 4 건)
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Bacillus megaterium Strain XTBG34 Promotes Plant Growth by Producing 2-Pentylfuran
Changsong Zou,Zhifang Li,Diqiu Yu 한국미생물학회 2010 The journal of microbiology Vol.48 No.4
Several chemical changes in soil are associated with plant growth-promoting rhizobacteria. An endosporeforming bacterium, strain XTBG34, was isolated from a Xishuangbanna Tropical Botanical Garden soil sample and identified as Bacillus megaterium. The strain’s volatiles had remarkable plant growth promotion activity in Arabidopsis thaliana plants; after 15 days treatment, the fresh weight of plants inoculated with XTBG34 was almost 2-fold compared with those inoculated with DH5α. Head space volatile compounds produced by XTBG34, trapped with headspace solid phase microextraction and identified by gas chromatography–mass spectrometry, included aldehydes, alkanes, ketones and aroma components. Of the 11 compounds assayed for plant growth promotion activity in divided Petri plates, only 2-pentylfuran increased plant growth. We have therefore identified a new plant growth promotion volatile of B. megaterium XTBG34, which deserves further study in the mechanisms of interaction between plant growth-promoting rhizobacteria and plants.
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Analysis of the Cold-Responsive Transcriptome in the Mature Pollen of Arabidopsis
Zou Changsong,Yu Diqiu 한국식물학회 2010 Journal of Plant Biology Vol.53 No.6
Mature pollen is very sensitive to cold stress in chilling-sensitive plants. To understand the genetic regulation of tolerance to cold stress, we analyzed the transcript expression profile in mature pollen of Arabidopsis using Affymetrix GeneChips containing ∼24,000 genes. Expression of 2,127 genes was cold-regulated, of which 697 genes were upregulated and 1,430 genes were downregulated. Further analysis showed that a large number of signal transduction components were significantly affected by cold treatment, indicating extensive changes in the gene regulatory networks of mature pollen. Many coldresponsive genes encode transcription factors, suggesting a multitude of transcriptional cascades. A number of genes important for the biosynthesis or signaling of plant hormones, such as abscisic acid, auxin, and jasmonate,were regulated by cold stress, which is of potential importance in coordinating cold tolerance with pollen growth and development. In addition, 159 mature pollenspecific genes that might be involved in pollen viability were also cold-regulated. Expression of the cold-responsive transcripts identified by microarray analysis was confirmed by quantitative real-time PCR. Our study provides an overall picture of the cold-responsive transcriptome in Arabidopsis pollen and is valuable for understanding gene regulation in response to cold stress and the molecular mechanisms of cold tolerance in mature pollen.
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Phylogenetic Analysis on the Bacteria Producing Non-Volatile Fungistatic Substances
ZhiFang Li,ChangSong Zou,YueQiu He,MingHe Mo,KeQin Zhang 한국미생물학회 2008 The journal of microbiology Vol.46 No.3
This study characterized the soil bacteria producing non-volatile fungistatic substances. Among the 2,100 colonies of soil bacteria randomly isolated from seven agricultural soil samples, 518 isolates (24.67% of total) showed fungistatic activity toward nematophagous fungi Paecilomyces lilacinus and Trichoderma viride by producing non-volatile substances. A phylogenetic analysis based on amplified ribosomal DNA restriction analysis (ARDRA) and 16S rDNA sequence placed the 518 bacteria in three groups of the domain Bacteria: Actinomycetales, Bacillales, and Gammaproteobacteria. Three genera, Arthrobacter, Bacillus, and Pseudomonas, were the most frequently encountered groups.
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Phylogenetic Diversity of Bacteria in an Earth-Cave in Guizhou Province, Southwest of China
JunPei Zhou,YingQi Gu,ChangSong Zou,MingHe Mo 한국미생물학회 2007 The journal of microbiology Vol.45 No.2
The objective of this study was to analyze the phylogenetic composition of bacterial community in the soil of an earth-cave (Niu Cave) using a culture-independent molecular approach. 16S rRNA genes were amplified directly from soil DNA with universally conserved and Bacteria-specific rRNA gene primers and cloned. The clone library was screened by restriction fragment length polymorphism (RFLP), and representative rRNA gene sequences were determined. A total of 115 bacterial sequence types were found in 190 analyzed clones. Phylogenetic sequence analyses revealed novel 16S rRNA gene sequence types and a high diversity of putative bacterial community. Members of these bacteria included Proteobacteria (42.6%), Acidobacteria (18.6%), Planctomycetes (9.0%), Chloroflexi (Green nonsulfur bacteria, 7.5%), Bacteroidetes (2.1%), Gemmatimonadetes (2.7%), Nitrospirae (8.0%), Actinobacteria (High G+C Gram-positive bacteria, 6.4%) and candidate divisions (including the OP3, GN08, and SBR1093, 3.2%). Thirty-five clones were affiliated with bacteria that were related to nitrogen, sulfur, iron or manganese cycles. The comparison of the present data with the data obtained previously from caves based on 16S rRNA gene analysis revealed similarities in the bacterial community components, especially in the high abundance of Proteobacteria and Acidobacteria. Furthermore, this study provided the novel evidence for presence of Gemmatimonadetes, Nitrosomonadales, Oceanospirillales, and Rubrobacterales in a karstic hypogean environment.
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