Abstract
Conyza canadensis is a widespread weed species forming dense populations in most regions of China. Petri dish bioassays with aqueous extracts of the aboveground parts and roots of C. canadensis at three concentrations (0.05, 0.1, and 0.2 g mL-1) were undertaken to investigate the autotoxic effects of C. canadensis, and the possible effects on three dominant native weed species, Plantago asiatica, Digitaria sanguinalis and Youngia japonica. The results showed that seed germination and the shoot length of three native species were significantly inhibited by aqueous extracts of C. canadensis at almost all concentrations that generally increased with increasing extract concentration. However, the seed germination and shoot length of C. canadensis itself was not significantly affected by the same extracts at all concentrations. These results suggested that the potential allelopathic compounds produced by the tissue of C. canadensis may contribute to its invasive success in invading southern China.
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Claims 5
Claim · model-written summary
Aqueous extracts of C. canadensis significantly inhibited seed germination and shoot length of the native species Plantago asiatica, generally more strongly with increasing extract concentration.
- Taxon
- Plantago asiatica
Plantago asiaticae0 - Treatment
- aqueous extracts of C. canadensise1
- Interactor
- C. canadensis
Erigeron canadensise1weed - Outcome
- seed germination and the shoot lengthe1
- Direction
- inhibitede1
- Qualifier
- generally increased with increasing extract concentratione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plantago asiatica”
e1“seed germination and the shoot length of three native species were significantly inhibited by aqueous extracts of C. canadensis at almost all concentrations that generally increased with increasing extract concentration”
Claim · model-written summary
Aqueous extracts of C. canadensis significantly inhibited seed germination and shoot length of the native species Digitaria sanguinalis, generally more strongly with increasing extract concentration.
- Taxon
- Digitaria sanguinalis
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Digitaria sanguinalise0 - Treatment
- aqueous extracts of C. canadensise1
- Interactor
- C. canadensisErigeron canadensise1weed
- Outcome
- seed germination and the shoot lengthe1
- Direction
- inhibitede1
- Qualifier
- generally increased with increasing extract concentratione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Digitaria sanguinalis”
e1“seed germination and the shoot length of three native species were significantly inhibited by aqueous extracts of C. canadensis at almost all concentrations that generally increased with increasing extract concentration”
Claim · model-written summary
Aqueous extracts of C. canadensis significantly inhibited seed germination and shoot length of the native species Youngia japonica, generally more strongly with increasing extract concentration.
- Taxon
- Youngia japonica
Youngia japonicae0 - Treatment
- aqueous extracts of C. canadensise1
- Interactor
- C. canadensisErigeron canadensise1weed
- Outcome
- seed germination and the shoot lengthe1
- Direction
- inhibitede1
- Qualifier
- generally increased with increasing extract concentratione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Youngia japonica”
e1“seed germination and the shoot length of three native species were significantly inhibited by aqueous extracts of C. canadensis at almost all concentrations that generally increased with increasing extract concentration”
Claim · model-written summary
Seed germination and shoot length of C. canadensis itself were not significantly affected by the same extracts at any concentration.
- Taxon
- C. canadensisErigeron canadensise2
- Treatment
- the same extractse2
- Outcome
- seed germination and shoot lengthe2
- Direction
- not significantly affectede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“seed germination and shoot length of C. canadensis itself was not significantly affected by the same extracts at all concentrations”
Claim · model-written summary
The authors suggest that allelopathic compounds produced by C. canadensis tissue may contribute to its invasive success in southern China.
- Taxon
- C. canadensisErigeron canadensise3
- Compound
- allelopathic compoundse3
- Outcome
- invasive successe3
- Setting
- southern Chinae3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“the potential allelopathic compounds produced by the tissue of C. canadensis may contribute to its invasive success in invading southern China”
The same questions in other papers
botanical · growth · Erigeron canadensis (horseweed)Positive and negative results
2 papers in the same direction as this paper · 5 in the opposite direction
- positive
- positive
- positive
4 papers more in this group
See all 8 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.