Abstract
The mechanisms of soybean continuous cropping obstacle were complicated.Previous research found many factors might cause the obstacle,such as the change of physical and chemical properties in the soil,plant allelopathy and soil-borne disease,among which soil-borne disease was the dominant reason for replanting obstacle.The microflora in the rhizoplane and rhizosphere were affected by the root activity of the soybean in the pervious year,a case in point was that the root exudates changed the soybean rhizosphere microorgnism communities,as a result of which the biological environment in rhizosphere was changed.So root exudates was a significant factor leading to soil-borne disease of the soybean in the next year.Many studies had indicated that the soybean root rot(SRR) was one of the most serious replanting diseases.Our previous experiment showed that the microflora is different in the rhizoplane and rhizosphere between resistant(Suinong 10,S10) cultivar and susceptible cultivars(Hefeng 25,H25).A more pathogenic microbe(Fusarium) was observed in the rhizoplane and rhizosphere soil of susceptible cultivar at the mature stage.The aim of the experiment was to investigate how the root of resistant cultivars and susceptible cultivars resisting SRR further influence the microflora in the rhizoplane and rhizosphere soil.Seeds were sowed in the soil and leaves and roots was removed out after the harvest of soybean planted the last year.With pot experiment,two cultivars were sowed,no planting as the control(bulk).The experiment was conducted in a greenhouse.Sampling was taken at the trifoliate stage,beginning of flowering stage,early filling stage and harvest maturity stage,respectively.The microflora in the rhizoplane,rhizosphere of the two cultivars and bulk soil were investigated during the growth stage with plate culture method. The results showed the numbers of colony forming units(CFU) of bacteria in the rhizoplane of the two cultivars decreased gradually with the growth of soybean indicating no significant difference in the rhizoplane and rhizosphere soil between the two cultivars.The numbers of CFU of bacteria in the rhizosphere of H25 decreased gradually with the growth of soybean,while that of S10 increased during the trifoliate stage to early filling stage,and then decreased dramatically at the mature stage.The root nodule weight of resistant cultivar S10 was significantly higher than that of the susceptible cultivar H25.It was observed that the number of CFU of fungi and fusarium in rhizoplane of H25 was much more than that of S10 at both trifoliate stage and mature stage.The seedling stage was the stage that soybean was easily infected of the root rot disease.In a word,the decrease in the number of rhizoplane and rhizosphere soil bacteria of both the resistant cultivar and susceptible soybean cultivars and the increase of fungi and fusarium at the mature stage indicated that soybean root exudates had certain selective acceleration or inhibition on the microflora in rhizoplane and rhizosphere soil.
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Claims 10
Claim · model-written summary
Bacterial CFU in the rhizoplane of both soybean cultivars decreased gradually as soybean grew.
- Taxon
- soybean
Glycine maxe1 - Organ / stage
- rhizoplanee1
- Outcome
- numbers of colony forming units(CFU) of bacteria in the rhizoplanee1
- Direction
- decreased graduallye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The results showed the numbers of colony forming units(CFU) of bacteria in the rhizoplane of the two cultivars decreased gradually with the growth of soybean indicating no significant difference in the rhizoplane and rhizosphere soil between the two cultivars”
Claim · model-written summary
No significant difference in rhizoplane and rhizosphere soil bacteria was found between the two soybean cultivars.
- Taxon
- soybeanGlycine maxe1
- Outcome
- rhizoplane and rhizosphere soile1
- Direction
- no_changeinferrede1
- Comparator
- the two cultivarse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The results showed the numbers of colony forming units(CFU) of bacteria in the rhizoplane of the two cultivars decreased gradually with the growth of soybean indicating no significant difference in the rhizoplane and rhizosphere soil between the two cultivars”
Claim · model-written summary
Bacterial CFU in the rhizosphere of susceptible cultivar H25 decreased gradually as soybean grew.
- Taxon
- soybeanGlycine maxe2
- Material
- H25e2
- Outcome
- numbers of CFU of bacteria in the rhizosphere of H25e2
- Direction
- decreased graduallye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The numbers of CFU of bacteria in the rhizosphere of H25 decreased gradually with the growth of soybean,while that of S10 increased during the trifoliate stage to early filling stage,and then decreased dramatically at the mature stage”
Claim · model-written summary
Bacterial CFU in the rhizosphere of resistant cultivar S10 increased from the trifoliate stage to early filling.
- Taxon
- soybeanGlycine maxe2
- Material
- S10e2
- Organ / stage
- rhizospheree2
- Outcome
- CFU of bacteriae2
- Direction
- increasede2
- Qualifier
- during the trifoliate stage to early filling stagee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The numbers of CFU of bacteria in the rhizosphere of H25 decreased gradually with the growth of soybean,while that of S10 increased during the trifoliate stage to early filling stage,and then decreased dramatically at the mature stage”
Claim · model-written summary
Bacterial CFU in the rhizosphere of resistant cultivar S10 decreased dramatically at the mature stage.
- Taxon
- soybeanGlycine maxe2
- Material
- S10e2
- Outcome
- CFU of bacteriae2
- Direction
- decreased dramaticallye2
- Qualifier
- at the mature stagee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The numbers of CFU of bacteria in the rhizosphere of H25 decreased gradually with the growth of soybean,while that of S10 increased during the trifoliate stage to early filling stage,and then decreased dramatically at the mature stage”
Claim · model-written summary
Root nodule weight of resistant cultivar S10 was significantly higher than that of susceptible cultivar H25.
- Taxon
- soybeanGlycine maxe1
- Material
- resistant cultivar S10e3
- Outcome
- root nodule weighte3
- Direction
- highere3
- Comparator
- susceptible cultivar H25e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The results showed the numbers of colony forming units(CFU) of bacteria in the rhizoplane of the two cultivars decreased gradually with the growth of soybean indicating no significant difference in the rhizoplane and rhizosphere soil between the two cultivars”
e3“The root nodule weight of resistant cultivar S10 was significantly higher than that of the susceptible cultivar H25”
Claim · model-written summary
Fungi and Fusarium CFU in the rhizoplane of susceptible H25 were much higher than in resistant S10 at both trifoliate and mature stages.
- Taxon
- soybeanGlycine maxe1
- Material
- H25e4
- Outcome
- number of CFU of fungi and fusarium in rhizoplanee4
- Direction
- much moree4
- Comparator
- S10e4
FusariumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The results showed the numbers of colony forming units(CFU) of bacteria in the rhizoplane of the two cultivars decreased gradually with the growth of soybean indicating no significant difference in the rhizoplane and rhizosphere soil between the two cultivars”
e4“It was observed that the number of CFU of fungi and fusarium in rhizoplane of H25 was much more than that of S10 at both trifoliate stage and mature stage”
Claim · model-written summary
Fungi and Fusarium CFU increased at the mature stage.
- Taxon
- soybeanGlycine maxe6
- Organ / stage
- mature stagee6
- Outcome
- increase of fungi and fusariume6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“In a word,the decrease in the number of rhizoplane and rhizosphere soil bacteria of both the resistant cultivar and susceptible soybean cultivars and the increase of fungi and fusarium at the mature stage indicated that soybean root exudates had certain selective acceleration or inhibition on the microflora in rhizoplane and rhizosphere soil”
Claim · model-written summary
Soybean was easily infected by root rot disease at the seedling stage.
- Taxon
- soybeanGlycine maxe5
- Organ / stage
- seedling stagee5
- Outcome
- easily infectede5
- Qualifier
- root rot diseasee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“The seedling stage was the stage that soybean was easily infected of the root rot disease”
Claim · model-written summary
Soybean root exudates are suggested to have selective acceleration or inhibition effects on rhizoplane and rhizosphere microflora.
- Taxon
- soybeanGlycine maxe6
- Outcome
- microflora in rhizoplane and rhizosphere soile6
- Qualifier
- soybean root exudates had certain selective acceleration or inhibitione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“In a word,the decrease in the number of rhizoplane and rhizosphere soil bacteria of both the resistant cultivar and susceptible soybean cultivars and the increase of fungi and fusarium at the mature stage indicated that soybean root exudates had certain selective acceleration or inhibition on the microflora in rhizoplane and rhizosphere soil”