Abstract
Problem statement: Seedlings of Amaranthus hybridus cv. NHAC-3 (large green, amaranth) and Lycopersicum esculentum cv. Roma (tomato) were subjected to 7 days water stress at Early Vegetative (EV), Late Vegetative (LV), Early Flowering (EF) and Late Flowering (LF) stages of growth to study the impact on leaf water potential (ψw), Nitrate Reductase Activity (NRA), growth (plant height, shoot and root biomass) and proline content of both plants. Approach: Two concentrations of salicylic acid (1 and 3 mM SA) were applied to stressed plants to study the level of protection given by SA to the plants. Leaf ψw was significantly reduced (p = 0.05) during stress treatment at nearly all stages of growth in both plants. Leaf ψw was in the range -0.25 to -1.42 (unstressed) and -1.45 to -2.02 (stressed) in tomato plants while in amaranth it was -0.7 to -1.62 (unstressed) and -1.62 to -2.68 (stressed). As 3 mM SA increased leaf ψw to values close to the control (unstressed plants). NRA was significantly (p = 0.05) reduced by stress treatment at the LV stage of amaranth, EF stage of tomato and LF stage of both plants. Results: Thus, the reduction of NRA was more pronounced at the reproductive stage of both plants. As 3 mM SA was effective in maintaining NRA at levels similar to the control in both plants. Stress treatment reduced plant height significantly (p = 0.05) at the vegetative stages of both plants and 3 mM was also effective in keeping plant height similar to the control. Though shoot biomass was affected by water stress, SA treatment was not very effective in preserving the biomass during stress. Root biomass of plants was reduced by stress treatment at the reproductive stage and only tomato plants responded positively to 3 mM SA. Proline content was only slightly increased at all stages of growth in stressed plants but 3 mM SA induced a two-fold increase in proline content at the vegetative stage of tomato (EV and LV) and significant increases (p = 0.05) at almost all stages of growth of amaranth. Conclusion/Recommendations: The build up of proline, an osmolyte, by SA in stressed plants increased the capacity of plants to absorb water from the soil as shown by the increase in leaf ψw of both plants from -1.45 to -0.25 . SA was more effective in protecting the plants against the adverse effects of water stress when the stress was given at the vegetative stages (EV and LV) than at the flowering stages (EF and LF).
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Claims 18
Claim · model-written summary
Water stress reduced leaf water potential in tomato.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- stressede0
- Outcome
- Leaf ψwe0
- Value
- -1.45 to -2.02e0
- Comparator
- unstressede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf ψw was in the range -0.25 to -1.42 (unstressed) and -1.45 to -2.02 (stressed) in tomato plants”
Claim · model-written summary
Water stress reduced leaf water potential in amaranth.
- Taxon
- amaranth
.JPG?width=60)
Amaranthus caudatuse0 - Treatment
- stressede0
- Outcome
- Leaf ψwt0
- Value
- -1.62 to -2.68e0
- Comparator
- unstressede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.JPG?width=500)
Verbatim
e0“in amaranth it was -0.7 to -1.62 (unstressed) and -1.62 to -2.68 (stressed).”
t0“Leaf ψw was significantly reduced”
Claim · model-written summary
3 mM salicylic acid increased leaf water potential toward control values.
- Taxon
- Amaranth and Tomato PlantsAmaranthus caudatusSolanum lycopersicumt0
- Treatment
- 3 mM SAe0
- Outcome
- leaf ψwe0
- Direction
- increasede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As 3 mM SA increased leaf ψw to values close to the control (unstressed plants).”
t0“Amaranth and Tomato Plants”
Claim · model-written summary
Stress reduced nitrate reductase activity at late vegetative stage in amaranth.
- Taxon
- amaranthAmaranthus caudatuse0
- Organ / stage
- LV stagee0
- Treatment
- stress treatmente0
- Outcome
- NRAe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NRA was significantly (p = 0.05) reduced by stress treatment at the LV stage of amaranth, EF stage of tomato and LF stage of both plants.”
Claim · model-written summary
Stress reduced nitrate reductase activity at early flowering stage in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- EF stagee0
- Treatment
- stress treatmente0
- Outcome
- NRAe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NRA was significantly (p = 0.05) reduced by stress treatment at the LV stage of amaranth, EF stage of tomato and LF stage of both plants.”
Claim · model-written summary
Stress reduced nitrate reductase activity at late flowering stage in both plants.
Not reportedComparator
Verbatim
e0“NRA was significantly (p = 0.05) reduced by stress treatment at the LV stage of amaranth, EF stage of tomato and LF stage of both plants.”
Claim · model-written summary
3 mM salicylic acid maintained nitrate reductase activity near control levels in both plants.
Verbatim
e0“As 3 mM SA was effective in maintaining NRA at levels similar to the control in both plants.”
Claim · model-written summary
Stress reduced plant height at vegetative stages in both plants.
- Taxon
- both plantse0
- Organ / stage
- vegetative stagese0
- Treatment
- Stress treatmente0
- Outcome
- plant heighte0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Stress treatment reduced plant height significantly (p = 0.05) at the vegetative stages of both plants”
Claim · model-written summary
3 mM salicylic acid kept plant height similar to control.
- Taxon
- Amaranth and Tomato PlantsAmaranthus caudatusSolanum lycopersicumt0
- Treatment
- 3 mMe0
- Outcome
- plant heighte0
- Direction
- similare0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“3 mM was also effective in keeping plant height similar to the control.”
t0“Amaranth and Tomato Plants”
Claim · model-written summary
Water stress affected shoot biomass.
- Taxon
- Amaranth and Tomato PlantsAmaranthus caudatusSolanum lycopersicumt0
- Treatment
- water stresse0
- Outcome
- shoot biomasse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Though shoot biomass was affected by water stress, SA treatment was not very effective in preserving the biomass during stress.”
t0“Amaranth and Tomato Plants”
Claim · model-written summary
Salicylic acid was not very effective at preserving shoot biomass under stress.
- Taxon
- Amaranth and Tomato PlantsAmaranthus caudatusSolanum lycopersicumt0
- Treatment
- SA treatmente0
- Outcome
- biomasse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SA treatment was not very effective in preserving the biomass during stress.”
t0“Amaranth and Tomato Plants”
Claim · model-written summary
Stress reduced root biomass at reproductive stage.
- Taxon
- plantsViridiplantaee0
- Organ / stage
- reproductive stagee0
- Treatment
- stress treatmente0
- Outcome
- Root biomasse0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Root biomass of plants was reduced by stress treatment at the reproductive stage”
Claim · model-written summary
Only tomato root biomass responded positively to 3 mM salicylic acid.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- 3 mM SAe0
- Outcome
- Root biomasst0
- Direction
- positivelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only tomato plants responded positively to 3 mM SA.”
t0“Root biomass of plants was reduced by stress treatment at the reproductive stage”
Claim · model-written summary
Proline rose slightly under stress across growth stages.
- Taxon
- plantsViridiplantaee0
- Treatment
- stressede0
- Outcome
- Proline contente0
- Direction
- increasede0
- Qualifier
- all stages of growthe0
Not reportedComparator
Verbatim
e0“Proline content was only slightly increased at all stages of growth in stressed plants”
Claim · model-written summary
3 mM salicylic acid doubled tomato proline at vegetative stages.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- vegetative stagee0
- Treatment
- 3 mM SAe0
- Outcome
- proline contente0
- Direction
- increasee0
- Value
- two-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“3 mM SA induced a two-fold increase in proline content at the vegetative stage of tomato (EV and LV)”
Claim · model-written summary
3 mM salicylic acid significantly raised amaranth proline at almost all growth stages.
- Taxon
- amaranthAmaranthus caudatuse0
- Treatment
- 3 mM SAt0
- Outcome
- proline contentt0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant increases (p = 0.05) at almost all stages of growth of amaranth.”
t0“3 mM SA induced a two-fold increase in proline content”
Claim · model-written summary
Authors concluded salicylic acid induced proline aided soil water absorption.
- Taxon
- plantsViridiplantaee0
- Treatment
- SAe0
- Compound
- prolinee0
- Outcome
- capacity of plants to absorb water from the soile0
Verbatim
e0“The build up of proline, an osmolyte, by SA in stressed plants increased the capacity of plants to absorb water from the soil as shown by the increase in leaf ψw of both plants from -1.45 to -0.25 .”
Claim · model-written summary
Salicylic acid protection was greater at vegetative than flowering stages.
Verbatim
e0“SA was more effective in protecting the plants against the adverse effects of water stress when the stress was given at the vegetative stages (EV and LV) than at the flowering stages (EF and LF).”
The same questions in other papers
salicylic acid · physiology: osmolytes · Solanum lycopersicum (tomato)Results differ
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See all 142 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.