Abstract
The exploitation of allelopathy for enhanced weed suppression is in its infancy despite major advancements in our knowledge of weed suppressive cultivars. Crop species, including wheat and canola have been identified as potentially being weed suppressive against annual ryegrass. However, the contribution of crop allelopathy to interference is complex to elucidate within a field context. Traditionally, experiments involving allelopathy only investigate one species as the donor and the other as the target, irrespective of the putative duality of allelopathic responses between some species. In this paper we investigate dual direction allelopathic responses between canola and annual ryegrass at the seedling stage utilising laboratory growth assays, specifically the equal compartment agar method (ECAM). By manipulating experimental conditions, such as sowing density, time of sowing and plant proximity, we compare the efficiency of each species to exert an allelopathic effect on the other. Both species exert an inhibitive effect on the other dependant on the starting experimental conditions which they are subjected. We found that increasing the time that each species grows in the agar before introduction of the other species significantly inhibits the growth of the later sown species, up to 83.6% inhibition of canola root length by annual ryegrass. Density also played an important role in determining the level of root inhibition found for both species. Canola and wheat varietal differences were observed in respect to the level of annual ryegrass inhibition found. This paper discusses the implications of these results in the larger context of varietal selection for weed suppression.
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Claims 6
Claim · model-written summary
Canola inhibited annual ryegrass growth under starting conditions.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napust0 - Interactor
- annual ryegrasst0weed
- Outcome
- inhibitive effect on the othere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Both species exert an inhibitive effect on the other dependant on the starting experimental conditions which they are subjected.”
t0“canola, wheat and annual ryegrass”
Claim · model-written summary
Annual ryegrass inhibited canola growth under starting conditions.
- Taxon
- canolaBrassica napus var. napust0
- Interactor
- annual ryegrasst0weed
- Outcome
- inhibitive effect on the othere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both species exert an inhibitive effect on the other dependant on the starting experimental conditions which they are subjected.”
t0“canola, wheat and annual ryegrass”
Claim · model-written summary
Earlier sowing of annual ryegrass inhibited later sown canola root length by up to 83.6%.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- increasing the time that each species grows in the agar before introduction of the other speciese0
- Interactor
- annual ryegrasse0weed
- Outcome
- canola root lengthe0
- Direction
- inhibitse0
- Value
- 83.6%e0
- Comparator
- later sown speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing the time that each species grows in the agar before introduction of the other species significantly inhibits the growth of the later sown species, up to 83.6% inhibition of canola root length by annual ryegrass.”
Claim · model-written summary
Density affected root inhibition in both canola and annual ryegrass.
- Taxon
- canolaBrassica napus var. napust0
- Interactor
- annual ryegrasst0weed
- Outcome
- level of root inhibitione0
- Qualifier
- both speciese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Density also played an important role in determining the level of root inhibition found for both species.”
t0“canola, wheat and annual ryegrass”
Claim · model-written summary
Canola varieties differed in their inhibition of annual ryegrass.
- Taxon
- CanolaBrassica napus var. napuse0
- Interactor
- annual ryegrasse0weed
- Outcome
- level of annual ryegrass inhibitione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Canola and wheat varietal differences were observed in respect to the level of annual ryegrass inhibition found.”
Claim · model-written summary
Wheat varieties differed in their inhibition of annual ryegrass.
- Taxon
- wheat
Triticum aestivume0 - Interactor
- annual ryegrasse0weed
- Outcome
- level of annual ryegrass inhibitione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Canola and wheat varietal differences were observed in respect to the level of annual ryegrass inhibition found.”
The same questions in other papers
agar · growth · Brassica napus (oilseed rape)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
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.