Abstract
The inhibitory effect (allelopathic potential) of shoot, seed and root extracts of 8 white, 5 red and 5 black rice (Oryza sativa L.) cultivars was determined against the seedling growth of lettuce (Lactuca sativa L.) and white clover (Trifolium repens L.). All extracts inhibited hypocotyl and root growth of lettuce and white clover seedlings, and those inhibitory activities ranged from –1% – 96%. The average inhibitory activity of the extracts on the hypocotyl and root growth of lettuce and white clover was 42 – 88%. No apparent difference in the inhibitory activity was found either among the extracts of white, red and black rice, or among the extracts of shoots, seeds and roots. However, the red rice cultivar Tsushima-akamai marked the greatest inhibitory activity with an average of 88% growth inhibition on hypocotyls and roots of lettuce and white clover, followed by Souja-akamai and Koshihikari. These results suggest two red rice, Tsushima-akamai and Souja-akamai, may be potentially useful for weed management in agriculture.
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Claims 8
Claim · model-written summary
All rice extracts inhibited lettuce seedling hypocotyl and root growth, with inhibitory activity ranging from –1% to 96%.
- Taxon
- rice
Oryza sativae0 - Treatment
- extractse1
- Interactor
- lettuce
Lactuca sativae1weed - Outcome
- hypocotyl and root growth of lettucee1
- Direction
- inhibitede1
- Value
- –1% – 96%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice (Oryza sativa L.) cultivars”
e1“All extracts inhibited hypocotyl and root growth of lettuce and white clover seedlings, and those inhibitory activities ranged from –1% – 96%.”
Claim · model-written summary
All rice extracts inhibited white clover seedling hypocotyl and root growth, with inhibitory activity ranging from –1% to 96%.
- Taxon
- riceOryza sativae0
- Treatment
- extractse1
- Interactor
- white clover
Trifolium repense1weed - Outcome
- hypocotyl and root growth of lettuce and white clover seedlingse1
- Direction
- inhibitede1
- Value
- –1% – 96%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice (Oryza sativa L.) cultivars”
e1“All extracts inhibited hypocotyl and root growth of lettuce and white clover seedlings, and those inhibitory activities ranged from –1% – 96%.”
Claim · model-written summary
Average inhibitory activity across lettuce and white clover hypocotyl and root growth was 42–88%.
- Taxon
- riceOryza sativae0
- Outcome
- average inhibitory activity of the extracts on the hypocotyl and root growth of lettuce and white clovere1
- Value
- 42 – 88%e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice (Oryza sativa L.) cultivars”
e1“The average inhibitory activity of the extracts on the hypocotyl and root growth of lettuce and white clover was 42 – 88%.”
Claim · model-written summary
Inhibitory activity showed no apparent difference among white, red and black rice extracts or among shoot, seed and root extracts.
- Taxon
- riceOryza sativae0
- Outcome
- inhibitory activitye0
- Direction
- No apparent differencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No apparent difference in the inhibitory activity was found either among the extracts of white, red and black rice, or among the extracts of shoots, seeds and roots.”
Claim · model-written summary
Tsushima-akamai had the greatest inhibitory activity, averaging 88% growth inhibition of lettuce and white clover hypocotyls and roots.
- Taxon
- riceOryza sativae0
- Material
- Tsushima-akamaie0
- Outcome
- growth inhibition on hypocotyls and roots of lettuce and white clovere0
- Direction
- greateste0
- Value
- 88%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the red rice cultivar Tsushima-akamai marked the greatest inhibitory activity with an average of 88% growth inhibition on hypocotyls and roots of lettuce and white clover”
Claim · model-written summary
Souja-akamai followed Tsushima-akamai for inhibitory activity.
- Taxon
- riceOryza sativae2
- Material
- Souja-akamaie0
- Outcome
- inhibitory activitye1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“followed by Souja-akamai and Koshihikari”
e1“Tsushima-akamai marked the greatest inhibitory activity”
e2“rice (Oryza sativa L.) cultivars”
Claim · model-written summary
Koshihikari followed Souja-akamai for inhibitory activity.
- Taxon
- riceOryza sativae2
- Material
- Koshihikarie0
- Outcome
- inhibitory activitye1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“followed by Souja-akamai and Koshihikari”
e1“Tsushima-akamai marked the greatest inhibitory activity”
e2“rice (Oryza sativa L.) cultivars”
Claim · model-written summary
The authors suggest Tsushima-akamai and Souja-akamai may be useful for weed management.
- Taxon
- riceOryza sativae0
- Material
- Tsushima-akamai and Souja-akamaie0
- Outcome
- weed management in agriculturee0
- Qualifier
- may be potentially usefule0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two red rice, Tsushima-akamai and Souja-akamai, may be potentially useful for weed management in agriculture”
The same questions in other papers
botanical · Lactuca sativa · Oryza sativa (rice)Results agree
5 papers in the same direction as this paper
- positive
- positive
- positive
2 papers more in this group
See all 6 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.