Abstract
High Resolution Image Download MS PowerPoint Slide Soil salinization is a major environmental problem that limits agricultural productivity, particularly in semiarid regions. Although the effects of salinity on crops are well documented, little is known about the response of weeds to this stress. Thus, the objective of this study was to evaluate the effect of salt stress on the growth and physiological traits of the weeds Amaranthus hybridus, Portulaca oleracea, Macroptilium lathyroides, Digitaria horizontalis, and Eleusine indica . The experiment was conducted in a randomized block design, with three replications, considering one plant per experimental plot. The species were subjected to five salinity levels in the irrigation water: 0.5 (control), 4.0, 8.0, 12.0, and 16.0 dS m –1 . Growth variables (height, stem diameter, number of leaves, leaf area, root length, and dry mass) and physiological parameters (chlorophyll content, net photosynthetic rate, transpiration rate, stomatal conductance, and water-use efficiencies) were measured. The results showed significant differences between the species regarding the response to salt stress. P. oleracea stood out for presenting greater tolerance, maintaining high values in morphophysiological variables, with only ∼30% reduction in biomass at 2.0 dS m –1 and ∼70% at 16.0 dS m –1 . In contrast, A. hybridus and M. lathyroides showed marked reductions in height (above 70%) and shoot biomass (up to 90%) at the highest salinities, while D. horizontalis and E. indica exhibited intermediate reductions of 40–76%. These results indicate that salinity affects the growth and physiological functioning of the species in a differentiated way, evidencing variations in the adaptive potential among the weeds evaluated.
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Claims 9
Claim · model-written summary
P. oleracea retained high physiological traits under salinity.
- Taxon
- P. oleracea
Portulaca oleraceae0 - Outcome
- morphophysiological variablese0
- Direction
- maintaining high valuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. oleracea stood out for presenting greater tolerance, maintaining high values in morphophysiological variables, with only ∼30% reduction in biomass at 2.0 dS m –1 and ∼70% at 16.0 dS m –1 .”
Claim · model-written summary
P. oleracea biomass fell ∼30% at 2.0 dS m –1.
- Taxon
- P. oleraceaPortulaca oleraceae0
- Treatment
- 2.0 dS m –1e0
- Outcome
- biomasse0
- Direction
- reductione0
- Value
- ∼30%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. oleracea stood out for presenting greater tolerance, maintaining high values in morphophysiological variables, with only ∼30% reduction in biomass at 2.0 dS m –1 and ∼70% at 16.0 dS m –1 .”
Claim · model-written summary
P. oleracea biomass fell ∼70% at 16.0 dS m –1.
- Taxon
- P. oleraceaPortulaca oleraceae0
- Treatment
- 16.0 dS m –1e0
- Outcome
- biomasse0
- Direction
- reductione0
- Value
- ∼70%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. oleracea stood out for presenting greater tolerance, maintaining high values in morphophysiological variables, with only ∼30% reduction in biomass at 2.0 dS m –1 and ∼70% at 16.0 dS m –1 .”
Claim · model-written summary
A. hybridus height fell above 70% at highest salinity.
- Taxon
- A. hybridus
Amaranthus hybriduse0 - Treatment
- highest salinitiese0
- Outcome
- heighte0
- Direction
- reductionse0
- Value
- above 70%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. hybridus and M. lathyroides showed marked reductions in height (above 70%) and shoot biomass (up to 90%) at the highest salinities”
Claim · model-written summary
M. lathyroides height fell above 70% at highest salinity.
- Taxon
- M. lathyroides
Macroptilium lathyroidese0 - Treatment
- highest salinitiese0
- Outcome
- heighte0
- Direction
- reductionse0
- Value
- above 70%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. hybridus and M. lathyroides showed marked reductions in height (above 70%) and shoot biomass (up to 90%) at the highest salinities”
Claim · model-written summary
A. hybridus shoot biomass fell up to 90% at highest salinity.
- Taxon
- A. hybridusAmaranthus hybriduse0
- Treatment
- highest salinitiese0
- Outcome
- shoot biomasse0
- Direction
- reductionse0
- Value
- up to 90%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. hybridus and M. lathyroides showed marked reductions in height (above 70%) and shoot biomass (up to 90%) at the highest salinities”
Claim · model-written summary
M. lathyroides shoot biomass fell up to 90% at highest salinity.
- Taxon
- M. lathyroidesMacroptilium lathyroidese0
- Treatment
- highest salinitiese0
- Outcome
- shoot biomasse0
- Direction
- reductionse0
- Value
- up to 90%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. hybridus and M. lathyroides showed marked reductions in height (above 70%) and shoot biomass (up to 90%) at the highest salinities”
Claim · model-written summary
D. horizontalis had intermediate reductions of 40–76%.
- Taxon
- D. horizontalisDigitaria horizontalise0
- Outcome
- intermediate reductionse0
- Direction
- reductionse0
- Value
- 40–76%e0
Not reportedTreatmentComparator
Verbatim
e0“D. horizontalis and E. indica exhibited intermediate reductions of 40–76%.”
Claim · model-written summary
E. indica had intermediate reductions of 40–76%.
- Taxon
- E. indica
Eleusine indicae0 - Outcome
- intermediate reductionse0
- Direction
- reductionse0
- Value
- 40–76%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“D. horizontalis and E. indica exhibited intermediate reductions of 40–76%.”
The same questions in other papers
salinity · growth · Amaranthus hybridus (smooth pigweed)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.