Abstract
ABSTRACT Allelopathic potential of a crop species varies depending on stage of growth. Because allelopathy of barley (Hordeum vulgare L.), an important cereal grain adapted to semi-arid conditions of northern Tunisia, has not been widely reported, a study was conducted to determine i) the potential autotoxicity of barley and ii) the differential allelopathic potential of barley plant components over four phenological stages. The study involved experiments with barley seed germination and seedling growth bioassay techniques for detection of allelopathic activity. Plant parts of field-grown ‘Rihane’ barley were extracted with distilled water. At growth stage 4 (stems not well developed), whole plants were extracted. Thereafter, roots, stems, and leaves were extracted separately. Water extracts of ‘Rihane’ barley plant parts were bioassayed on four varieties of barley. Seedling growth bioassays revealed autotoxicity of barley, which appeared to be more pronounced on radicle growth than coleoptile growth, especially when plants near physiological maturity were extracted. Autotoxicity was not significant when ‘Rihane’ barley was simultaneously the donor and recipient of water extracts. Leaves were the most important source of allelopathic substances. Root extracts were least inhibitory toward both radicle and coleoptile growth. Results suggest qualitative and quantitative changes in allelopathic substances in barley plant parts during plant development.
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Claims 5
Claim · model-written summary
Barley extracts were more autotoxic to radicle than coleoptile growth, especially near donor maturity.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Treatment
- autotoxicity of barleye0
- Outcome
- radicle growthe0
- Direction
- more pronouncede0
- Qualifier
- especially when plants near physiological maturity were extractede0
- Comparator
- coleoptile growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Seedling growth bioassays revealed autotoxicity of barley, which appeared to be more pronounced on radicle growth than coleoptile growth, especially when plants near physiological maturity were extracted.”
Claim · model-written summary
Autotoxicity was not significant when Rihane barley supplied and received its own extracts.
- Taxon
- barleyHordeum vulgaree0
- Material
- ‘Rihane’e0
- Outcome
- Autotoxicitye0
- Qualifier
- simultaneously the donor and recipient of water extractse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Autotoxicity was not significant when ‘Rihane’ barley was simultaneously the donor and recipient of water extracts.”
Claim · model-written summary
Leaves were the main source of allelopathic substances.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- Leavese0
- Outcome
- most important source of allelopathic substancese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves were the most important source of allelopathic substances.”
t0“barley”
Claim · model-written summary
Root extracts were least inhibitory to radicle and coleoptile growth.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- Root extractse0
- Outcome
- radicle and coleoptile growthe0
- Direction
- least inhibitorye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root extracts were least inhibitory toward both radicle and coleoptile growth.”
t0“barley”
Claim · model-written summary
Allelopathic substances appear to change in quality and amount during barley development.
- Taxon
- barleyHordeum vulgaree0
- Organ / stage
- plant partse0
- Outcome
- qualitative and quantitative changes in allelopathic substancese0
- Qualifier
- during plant developmente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results suggest qualitative and quantitative changes in allelopathic substances in barley plant parts during plant development.”
The same questions in other papers
botanical · growth · Hordeum vulgare (barley)Positive and negative results
47 papers in the same direction as this paper · 35 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
- negative
80 papers more in this group
See all 84 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.