Abstract
The research on relationship between rhizosphere microbes and root exudates has a great significance on discussion of interaction between rhizosphere microbes and plants, as well as control of soil-borne diseases and insect pest. GC-MS was used to analyze changes of tobacco root exudates under the antagonistic action of tobacco bacterial wilt and black shank. It turned out that when pathogens of tobacco bacterial wilt and black shank in tobacco root microorganisms increase, tobacco root exudates augmented rapidly among of which organic acids have the biggest growth, followed by amines. When the pathogens of tobacco bacterial wilt and black shank are inhibited by the active substance of antagonistic antibacterial, 20 - 23 kinds of root exudates are added; besides, the content of 7 substances was reduced to 0. Another inter-esting finding was that the fluctuations of phthalic acid, isophthalic acid and benzoic acid, which have caused continuous cropping obstacles, were very dis-tinct. The results of this study have provided novel clues for the exploration of continuous tobacco cropping obstacles and soil-borne diseases.
Highlights
Plant-microorganism interaction maintains or dominates the ecological functions of terrestrial ecosystems
When the pathogens of tobacco bacterial wilt and black shank are inhibited by the active substance of antagonistic antibacterial, 20 - 23 kinds of root exudates are added; besides, the content of 7 substances was reduced to 0
The composition of the root exudates of Yunyan 87 was analyzed by gas chromatography-mass spectrometry (GC-MS) after irrigating pathogen of bacterial wilt and its antagonist
Summary
Plant-microorganism interaction maintains or dominates the ecological functions of terrestrial ecosystems. Inoculation with Bacillus subtilis B26 increased the yield of rape (B. distachyon), and increased drought resistance [20], even in the absence of nitrogen source Both (Azospirillum) and (Herbaspirillum) of Vibrio herbaceus could promote the growth of Brassica napus [21]. These studies suggest that rhizosphere microbes play a potential role in plant root exudates. The components of tobacco root exudates under the action of different rhizosphere microorganisms were detected and analyzed by gas chromatography-mass spectrometry (GC-MS), and the changes of tobacco root exudates were discussed It provides effective information for the study of how microbes change cell membrane permeability and signal transduction, and provides a new clue for the prevention and treatment of tobacco soil-borne diseases
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