TITLE:
Effects of Intercropping on Rhizosphere Soil Bacterial Communities in Amorphophallus konjac
AUTHORS:
Jinping Wu, Zhenbiao Jiao, Jie Zhou, Wei Zhang, Shengwu Xu, Fengling Guo
KEYWORDS:
Amorphophallus konjac, Soft Rot Disease, Bacterial Community, Intercropping
JOURNAL NAME:
Open Journal of Soil Science,
Vol.8 No.9,
September
4,
2018
ABSTRACT: Soft rot disease causes heavy loss in konjac production every year, which
caused by the genus Pectobacterium has been recognized as a major reason
why konjac industry has not boomed in worldwide. However, intercropping
with economically important trees can effectively control affect soft rot disease
epidemics. Consequently, we conducted a rhizosphere bacterial diversity study
to assess how intercropping affects soft rot disease using next-generation DNA
sequencing. The results demonstrate the Shannon diversity index and Chao 1
index for soil bacteria were relatively steady under intercropping conditions,
but changed greatly for the konjac monocrop with the increase in the number
of cropping years. Of the 44 bacterial genera with relative abundance ratios
of >0.3%, 11 were significantly affected by the duration of continuous cropping
and the cultivation mode. Luteolibacter and Bacteroides showed highly
significant differences between the monocrop and the intercrop for three
continuous years. Pseudomonas was significantly affected by the different
cultivation modes, while Myroides was significantly affected by planting age.
Intercropping altered the structure and composition of the soil bacterial community,
which led to a relative balance of beneficial bacteria, and the relative
balance of beneficial bacteria is helpful to reduce the incidence of soft rot.