TITLE:
Effects of Tobacco Pathogens and Their Antagonistic Bacteria on Tobacco Root Exudates
AUTHORS:
Cheng Li, Jun Yu, Lu Gan, Jingguo Sun, Changjun Wang, Qin Wang, Shouwen Chen, Yong Yang
KEYWORDS:
Root Exudates, Rhizosphere Microbes, Allelochemical, GC-MS
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.8 No.11,
November
28,
2018
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.