Abstract
The soybean cyst nematode (SCN) is a major yield-limiting pest of soybean. In this study, experiments were conducted to examine the diversity of parasitic fungi from SCN associated with disease-suppressive soil fields in Northeast China. Soil samples were collected from three fields under different rotation systems that were established in 1991: (1) a continuous long-term cropping field with soybean (SSSS) that had been shown to be SCN-suppressive, (2) cycles of three-year rotation with corn, soybean, and wheat (WCS), and (3) continuous cropping field with three-year cycles of two years soybean and one-year corn (SSC). In the traditional method result, cyst densities of SCN declined as increase of parasitic fungi, and the percentage of parasitic fungi associated with cyst of SCN was higher in SSSS field than other two fields. Polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) also showed that parasitic fungi of SCN were also increased in SSSS field, compared with the other two fields. Principal component analysis based on PCR-DGGE data revealed that fungal communities on cysts could be divided into three groups: one group occurred in SSSS, and the other two groups were in WCS and SSC fields, respectively. Long-term cropping with soybean monoculture in the black soil field might increase parasitic fungi of SCN. These fungal communities may play an important role in the ecological suppression of SCN in disease-suppressive soil.
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Claims 5
Claim · model-written summary
SCN cyst density declined as parasitic fungi increased.
- Taxon
- soybean
Glycine maxe1 - Interactor
- SCNe0pest
- Outcome
- cyst densities of SCNe0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cyst densities of SCN declined as increase of parasitic fungi”
e1“pest of soybean”
Claim · model-written summary
The percentage of parasitic fungi on SCN cysts was higher in continuous soybean than in the two other fields.
- Taxon
- soybeanGlycine maxe1
- Interactor
- SCNe0pest
- Outcome
- percentage of parasitic fungi associated with cyst of SCNe0
- Direction
- highere0
- Comparator
- other two fieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the percentage of parasitic fungi associated with cyst of SCN was higher in SSSS field than other two fields.”
e1“pest of soybean”
Claim · model-written summary
PCR-DGGE indicated increased SCN-parasitic fungi in continuous soybean.
- Taxon
- soybeanGlycine maxe1
- Interactor
- SCNe0pest
- Outcome
- parasitic fungi of SCNe0
- Direction
- increasede0
- Comparator
- the other two fieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“parasitic fungi of SCN were also increased in SSSS field, compared with the other two fields.”
e1“pest of soybean”
Claim · model-written summary
Fungi on cysts separated into three rotation-system groups.
- Taxon
- soybeanGlycine maxe1
- Outcome
- fungal communities on cysts could be divided into three groupse0
- Value
- three groupse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fungal communities on cysts could be divided into three groups: one group occurred in SSSS, and the other two groups were in WCS and SSC fields, respectively.”
e1“pest of soybean”
Claim · model-written summary
Continuous soybean cropping might increase parasitic fungi of SCN.
- Taxon
- soybeanGlycine maxe0
- Interactor
- SCNe0pest
- Outcome
- parasitic fungi of SCNe0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Long-term cropping with soybean monoculture in the black soil field might increase parasitic fungi of SCN.”