Abstract
Allelochemicals, secreting or releasing from root in course of crop growth, were generally regarded as an important factor inducing continuous cropping obstacles. To gain insight into the nature of allelochemicals and root disease incidence, the aqueous exudates collected by XAD-4 resin was identified by GC-MS technique, whereafter the effect of root exudates on cucumber radicle as well as phenolic compounds on F. oxysporum growth was investigated. Results revealed that the main components of root exudates were identified as benzoic acid and its ramification such as vallinic acid, ferulic acid, benzene-propanoic acid and p-hydroxybenzoic acid. Additionally, some long chain fatty acid including hexadecanoic acid, octadecanoic acid, butanedioic acid, tetradecanoic acid were also detected. The acid, neutral and alkaline components of collected exudates showed a certain restrain effect on cucumber radicle elongation, but the restrain effect of acid component was more apparent. Within 42 hours, F. oxysporum growth was stimulated under low concentration of 50 mg·L-1, and restrained when higher than 50 mg·L-1. After 64 hours, however, the tolerant ability to phenolic compounds enhanced and the repress effect was not so evident. Our work contributed much to the mechanism of continuous cucumber cropping in the view of rihzosphere microecology.
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Claims 6
Claim · model-written summary
Cucumber root exudates included benzoic acid and related phenolic acids.
- Taxon
- cucumber
Cucumis sativust0 - Organ / stage
- root exudatese0
- Outcome
- benzoic acid and its ramification such as vallinic acid, ferulic acid, benzene-propanoic acid and p-hydroxybenzoic acide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“main components of root exudates were identified as benzoic acid and its ramification such as vallinic acid, ferulic acid, benzene-propanoic acid and p-hydroxybenzoic acid”
t0“cucumber”
Claim · model-written summary
Long-chain fatty acids were also detected in cucumber root exudates.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- root exudatest0
- Outcome
- hexadecanoic acid, octadecanoic acid, butanedioic acid, tetradecanoic acide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“long chain fatty acid including hexadecanoic acid, octadecanoic acid, butanedioic acid, tetradecanoic acid were also detected”
t0“cucumber root exudates”
Claim · model-written summary
Acid, neutral and alkaline exudate components restrained cucumber radicle elongation, with the acid component stronger.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- acid, neutral and alkaline components of collected exudatese0
- Outcome
- cucumber radicle elongatione0
- Direction
- restraine0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The acid, neutral and alkaline components of collected exudates showed a certain restrain effect on cucumber radicle elongation, but the restrain effect of acid component was more apparent”
Claim · model-written summary
Phenolic compounds stimulated F. oxysporum growth at 50 mg·L-1 within 42 hours.
- Taxon
- cucumberCucumis sativust0
- Treatment
- 50 mg·L-1e0
- Interactor
- F. oxysporum
_(Fusarium_oxysporum_f.sp._batatas)_1234227-PPT-Clemson_University.jpg?width=60)
Fusarium oxysporume0pathogen - Outcome
- F. oxysporum growthe0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_(Fusarium_oxysporum_f.sp._batatas)_1234227-PPT-Clemson_University.jpg?width=500)
Verbatim
e0“Within 42 hours, F. oxysporum growth was stimulated under low concentration of 50 mg·L-1”
t0“cucumber”
Claim · model-written summary
F. oxysporum growth was restrained above 50 mg·L-1 within 42 hours.
- Taxon
- cucumberCucumis sativust0
- Treatment
- higher than 50 mg·L-1e0
- Interactor
- F. oxysporumFusarium oxysporume0pathogen
- Outcome
- F. oxysporum growthe0
- Direction
- restrainede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Within 42 hours, F. oxysporum growth was stimulated under low concentration of 50 mg·L-1, and restrained when higher than 50 mg·L-1”
t0“cucumber”
Claim · model-written summary
After 64 hours F. oxysporum tolerance increased and repression weakened.
- Taxon
- cucumberCucumis sativust0
- Interactor
- F. oxysporumFusarium oxysporume1pathogen
- Outcome
- F. oxysporum growthe1
- Direction
- enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 64 hours, however, the tolerant ability to phenolic compounds enhanced and the repress effect was not so evident”
e1“Within 42 hours, F. oxysporum growth was stimulated”
t0“cucumber”
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See all 11 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.