Abstract
Tobacco rhizospheric soil of different planting years was used to explore allelopathic effects and allelochemical identification.The treatments of 0,5,1,0.5,0.2 g·mL–1 aqueous extractions and 2 g·mL–1 different organic solvent extractions from the rhizospheric soil were bioassayed using Lettuce(Lactuca sativa) and tobacco in laboratory.The allelochemicals(autotoxicity compounds) in methanol extraction of rhizospheric soil were identified by gas chromatography-mass spectrometry(GC-MS).Results showed that(1) radical growth of Lettuce and tobacco seedlings was all affected by aqueous extractions of the rhizospheric soil,showing stimulative effect at low dosage and inhibitory effect at high dosage,and the inhibitory effect was increased as the continuous cropping years increased;(2) n-hexane,chloroform and ethyl acetate extraction of the rhizospheric soil showed no allelopathic effects on radical growth of Lactuca sativa and tobacco seedlings.Methanol extraction of the rhizospheric soil had the strongest allelopathic effect on target plants with concentration of 2 g·mL–1,which indicated that allelopathic compounds of the rhizospheric soil might come from some strong polar compounds;and(3) by GC-MS determination,the compounds of methanol extraction from rhizospheric soil after continuous cropping for one season and three seasons respectively were alkane,alcohols,alcohols,acid,ester,phenol,terpene and polycyclic aromatic hydrocarbons etc.,most of which had been reported as allelochemicals.
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Claims 10
Claim · model-written summary
Low doses of tobacco rhizospheric soil aqueous extracts stimulated lettuce seedling root growth.
- Taxon
- Lettuce
Lactuca sativae0 - Treatment
- aqueous extractions of the rhizospheric soile0
- Outcome
- radical growthe0
- Direction
- stimulativee0
- Qualifier
- low dosagee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“radical growth of Lettuce and tobacco seedlings was all affected by aqueous extractions of the rhizospheric soil,showing stimulative effect at low dosage”
Claim · model-written summary
Low doses of tobacco rhizospheric soil aqueous extracts stimulated tobacco seedling root growth.
- Taxon
- tobacco
Nicotiana tabacume0 - Treatment
- aqueous extractions of the rhizospheric soile0
- Outcome
- radical growthe0
- Direction
- stimulativee0
- Qualifier
- low dosagee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“radical growth of Lettuce and tobacco seedlings was all affected by aqueous extractions of the rhizospheric soil,showing stimulative effect at low dosage”
Claim · model-written summary
High doses of tobacco rhizospheric soil aqueous extracts inhibited lettuce seedling root growth.
- Taxon
- LettuceLactuca sativae0
- Treatment
- aqueous extractions of the rhizospheric soile0
- Outcome
- radical growthe0
- Direction
- inhibitorye0
- Qualifier
- high dosagee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“radical growth of Lettuce and tobacco seedlings was all affected by aqueous extractions of the rhizospheric soil,showing stimulative effect at low dosage and inhibitory effect at high dosage”
Claim · model-written summary
High doses of tobacco rhizospheric soil aqueous extracts inhibited tobacco seedling root growth.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- aqueous extractions of the rhizospheric soile0
- Outcome
- radical growthe0
- Direction
- inhibitorye0
- Qualifier
- high dosagee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“radical growth of Lettuce and tobacco seedlings was all affected by aqueous extractions of the rhizospheric soil,showing stimulative effect at low dosage and inhibitory effect at high dosage”
Claim · model-written summary
The inhibitory effect increased with continuous cropping years.
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- inhibitory effecte0
- Direction
- increasede0
- Setting
- continuous croppinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the inhibitory effect was increased as the continuous cropping years increased”
t0“tobacco”
Claim · model-written summary
n-hexane extract showed no allelopathic effect on lettuce and tobacco seedling root growth.
- Taxon
- Lactuca sativaLactuca sativae0
- Treatment
- n-hexanee0
- Outcome
- radical growthe0
- Direction
- no allelopathic effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“n-hexane,chloroform and ethyl acetate extraction of the rhizospheric soil showed no allelopathic effects on radical growth of Lactuca sativa and tobacco seedlings”
Claim · model-written summary
Chloroform extract showed no allelopathic effect on lettuce seedling root growth.
- Taxon
- Lactuca sativaLactuca sativae0
- Treatment
- chloroforme0
- Outcome
- radical growthe0
- Direction
- no allelopathic effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“n-hexane,chloroform and ethyl acetate extraction of the rhizospheric soil showed no allelopathic effects on radical growth of Lactuca sativa and tobacco seedlings”
Claim · model-written summary
Ethyl acetate extract showed no allelopathic effect on lettuce seedling root growth.
- Taxon
- Lactuca sativaLactuca sativae0
- Treatment
- ethyl acetatee0
- Outcome
- radical growthe0
- Direction
- no allelopathic effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“n-hexane,chloroform and ethyl acetate extraction of the rhizospheric soil showed no allelopathic effects on radical growth of Lactuca sativa and tobacco seedlings”
Claim · model-written summary
Methanol extraction had the strongest allelopathic effect on target plants at 2 g·mL–1.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- Methanol extraction of the rhizospheric soile0
- Outcome
- allelopathic effecte0
- Direction
- strongeste0
- Value
- 2 g·mL–1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Methanol extraction of the rhizospheric soil had the strongest allelopathic effect on target plants with concentration of 2 g·mL–1”
t0“tobacco”
Claim · model-written summary
Methanol extracts after one and three seasons contained several compound classes.
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- alkane,alcohols,alcohols,acid,ester,phenol,terpene and polycyclic aromatic hydrocarbonse0
- Qualifier
- one season and three seasonse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the compounds of methanol extraction from rhizospheric soil after continuous cropping for one season and three seasons respectively were alkane,alcohols,alcohols,acid,ester,phenol,terpene and polycyclic aromatic hydrocarbons etc.”
t0“tobacco”
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See all 10 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.