Abstract
A greenhouse experiment was conducted to study the effects of the O2 root zone level and grafting on chlorophyll fluorescence, photosynthesis and growth of cherry tomato grown in a hydroponic system. Two O2 concentrations in the root zone, namely Ox (saturation level) and Ox- (2–3 mg L−1), were applied for 30 days on self-grafted cherry tomato Dreamer or grafted onto the hybrids Arnold, Beaufort, Maxifort and Top Pittam. Root hypoxia increased minimum fluorescence (by 10%) while it decreased variable fluorescence and the maximum quantum yield of PSII (up to 16 and 8%, respectively). Moreover, it reduced leaf photosynthesis, transpiration and stomatal conductance (by 12, 17 and 13%, respectively), whereas it increased leaf electrolyte leakage (by 2.1%). The graft combinations showed a different ability in buffering the effects of root hypoxia on plant growth and related components, and these differences were related to their root biomass. The minimum fluorescence was negatively correlated to plant growth, so it may be a useful indicator to select tolerant rootstocks to root hypoxia. Our results suggest the occurrence of both diffusive and metabolic constraints to tomato photosynthesis under root hypoxia, a condition that can be mitigated by selecting rootstocks with a more developed root system.
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Claims 12
Claim · model-written summary
Root hypoxia increased minimum fluorescence by 10%.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- Root hypoxiae0
- Outcome
- minimum fluorescencee0
- Direction
- increasede0
- Value
- 10%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root hypoxia increased minimum fluorescence (by 10%) while it decreased variable fluorescence and the maximum quantum yield of PSII (up to 16 and 8%, respectively).”
t0“Tomato Plants”
Claim · model-written summary
Root hypoxia decreased variable fluorescence by 16%.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Root hypoxiae0
- Outcome
- variable fluorescencee0
- Direction
- decreasede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root hypoxia increased minimum fluorescence (by 10%) while it decreased variable fluorescence and the maximum quantum yield of PSII (up to 16 and 8%, respectively).”
t0“Tomato Plants”
Claim · model-written summary
Root hypoxia decreased maximum quantum yield of PSII by 8%.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Root hypoxiae0
- Outcome
- maximum quantum yield of PSIIe0
- Direction
- decreasede0
- Value
- 8%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root hypoxia increased minimum fluorescence (by 10%) while it decreased variable fluorescence and the maximum quantum yield of PSII (up to 16 and 8%, respectively).”
t0“Tomato Plants”
Claim · model-written summary
Root hypoxia reduced leaf photosynthesis by 12%.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- root hypoxiae1
- Outcome
- leaf photosynthesise0
- Direction
- reducede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moreover, it reduced leaf photosynthesis, transpiration and stomatal conductance (by 12, 17 and 13%, respectively), whereas it increased leaf electrolyte leakage (by 2.1%).”
t0“Tomato Plants”
e1“Root hypoxia increased minimum fluorescence (by 10%)”
Claim · model-written summary
Root hypoxia reduced transpiration by 17%.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- root hypoxiae1
- Outcome
- transpiratione0
- Direction
- reducede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moreover, it reduced leaf photosynthesis, transpiration and stomatal conductance (by 12, 17 and 13%, respectively), whereas it increased leaf electrolyte leakage (by 2.1%).”
t0“Tomato Plants”
e1“Root hypoxia increased minimum fluorescence (by 10%)”
Claim · model-written summary
Root hypoxia reduced stomatal conductance by 13%.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- root hypoxiae1
- Outcome
- stomatal conductancee0
- Direction
- reducede0
- Value
- 13%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moreover, it reduced leaf photosynthesis, transpiration and stomatal conductance (by 12, 17 and 13%, respectively), whereas it increased leaf electrolyte leakage (by 2.1%).”
t0“Tomato Plants”
e1“Root hypoxia increased minimum fluorescence (by 10%)”
Claim · model-written summary
Root hypoxia increased leaf electrolyte leakage by 2.1%.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- root hypoxiae1
- Outcome
- leaf electrolyte leakagee0
- Direction
- increasede0
- Value
- 2.1%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moreover, it reduced leaf photosynthesis, transpiration and stomatal conductance (by 12, 17 and 13%, respectively), whereas it increased leaf electrolyte leakage (by 2.1%).”
t0“Tomato Plants”
e1“Root hypoxia increased minimum fluorescence (by 10%)”
Claim · model-written summary
Graft combinations differed in buffering hypoxia effects on plant growth, with differences related to root biomass.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- graft combinationse0
- Outcome
- plant growth and related componentse0
- Qualifier
- related to their root biomasse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The graft combinations showed a different ability in buffering the effects of root hypoxia on plant growth and related components, and these differences were related to their root biomass.”
t0“Tomato Plants”
Claim · model-written summary
Minimum fluorescence was negatively correlated with plant growth.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- plant growthe0
- Direction
- negatively correlatede0
- Comparator
- minimum fluorescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The minimum fluorescence was negatively correlated to plant growth”
t0“Tomato Plants”
Claim · model-written summary
Minimum fluorescence may be useful for selecting rootstocks tolerant of root hypoxia.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- select tolerant rootstocks to root hypoxiae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it may be a useful indicator to select tolerant rootstocks to root hypoxia.”
t0“Tomato Plants”
Claim · model-written summary
The authors suggest both diffusive and metabolic constraints to tomato photosynthesis under root hypoxia.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- root hypoxiae0
- Outcome
- tomato photosynthesise0
- Qualifier
- diffusive and metabolic constraintse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our results suggest the occurrence of both diffusive and metabolic constraints to tomato photosynthesis under root hypoxia”
Claim · model-written summary
Selecting rootstocks with more developed roots may mitigate root hypoxia.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- mitigated by selecting rootstocks with a more developed root systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a condition that can be mitigated by selecting rootstocks with a more developed root system.”
t0“Tomato Plants”
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