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Soil bacterial and fungal community dynamics in relation to Panax notoginseng death rate in a continuous cropping system
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Soil bacterial and fungal community dynamics in relation to Panax notoginseng death rate in a continuous cropping system
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Journal Article
Soil bacterial and fungal community dynamics in relation to Panax notoginseng death rate in a continuous cropping system
2016
Overview
Notoginseng (
Panax notoginseng
), a valuable herbal medicine, has high death rates in continuous cropping systems. Variation in the soil microbial community is considered the primary cause of notoginseng mortality, although the taxa responsible for crop failure remains unidentified. This study used high-throughput sequencing methods to characterize changes in the microbial community and screen microbial taxa related to the death rate. Fungal diversity significantly decreased in soils cropped with notoginseng for three years. The death rate and the fungal diversity were significantly negatively correlated, suggesting that fungal diversity might be a potential bioindicator of soil health. Positive correlation coefficients revealed that Burkholderiales, Syntrophobacteraceae,
Myrmecridium
,
Phaeosphaeria
,
Fusarium
and
Phoma
were better adapted to colonization of diseased plants. The relative abundance of
Fusarium oxysporum
(
R
= 0.841,
P
< 0.05) and
Phaeosphaeria rousseliana
(
R
= 0.830,
P
< 0.05) were positively associated with the death rate.
F. oxysporum
was a pathogen of notoginseng root-rot that caused seedling death. Negative correlation coefficients indicated that Thermogemmatisporaceae, Actinosynnemataceae, Hydnodontaceae, Herpotrichiellaceae and
Coniosporium
might be antagonists of pathogens and the relative abundance of
Coniosporium perforans
was negatively correlated with the death rate. Our findings provide a dynamic overview of the microbial community and present a clear scope for screening beneficial microbes and pathogens of notoginseng.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
