Abstract
Competition decreased transpiration from young lettuce plants after 2 days, before any reductions in leaf area became apparent, and stomatal conductance (g(s) ) of lettuce and tomato plants was also reduced. Stomatal closure was not due to hydraulic signals or competition for nutrients, as soil water content, leaf water status and leaf nitrate concentrations were unaffected by neighbours. Competition-induced stomatal closure was absent in an abscisic acid (ABA)-deficient tomato mutant, flacca, indicating a fundamental involvement of ABA. Although tomato xylem sap ABA concentrations were unaffected by the presence of neighbours, ABA/pH-based stomatal modulation is still likely to underlie the response to competition, as soil and xylem sap alkalization was observed in competing plants. Competition also modulated leaf ethylene production, and treatment of lettuce plants with an ethylene perception inhibitor (1-methylcyclopropene) diminished the difference in g(s) between single and competing plants grown in a controlled environment room, but increased it in plants grown in the greenhouse: ethylene altered the extent of the stomatal response to competition. Effects of competition on g(s) are discussed in terms of the detection of the absence of neighbours: increases in g(s) and carbon fixation may allow faster initial space occupancy within an emerging community/crop.
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The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
Competition reduced transpiration in lettuce.
- Taxon
- lettuce
Lactuca sativae0 - Organ / stage
- young lettuce plantse0
- Treatment
- Competitione0
- Outcome
- transpiratione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Competition decreased transpiration from young lettuce plants after 2 days, before any reductions in leaf area became apparent”
Claim · model-written summary
Competition reduced stomatal conductance (g(s) ) in lettuce.
- Taxon
- lettuceLactuca sativae0
- Outcome
- stomatal conductance (g(s) )e0
- Direction
- reducede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stomatal conductance (g(s) ) of lettuce and tomato plants was also reduced”
Claim · model-written summary
Competition reduced stomatal conductance (g(s) ) in tomato.
- Taxon
- tomato
Solanum lycopersicume0 - Outcome
- stomatal conductance (g(s) )e0
- Direction
- reducede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stomatal conductance (g(s) ) of lettuce and tomato plants was also reduced”
Claim · model-written summary
Neighbours did not affect soil water content, leaf water status or leaf nitrate concentrations.
- Taxon
- lettuceLactuca sativat0
- Treatment
- neighbourse0
- Outcome
- soil water content, leaf water status and leaf nitrate concentrationse0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil water content, leaf water status and leaf nitrate concentrations were unaffected by neighbours”
t0“lettuce and tomato plants”
Claim · model-written summary
Competition induced stomatal closure was absent in the ABA deficient tomato mutant flacca.
- Taxon
- tomatoSolanum lycopersicume0
- Material
- flaccae0
- Treatment
- Competitione0
- Outcome
- stomatal closuree0
- Direction
- absente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Competition-induced stomatal closure was absent in an abscisic acid (ABA)-deficient tomato mutant, flacca”
t0“lettuce and tomato plants”
Claim · model-written summary
Neighbour presence did not affect tomato xylem sap ABA concentrations.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- presence of neighbourse0
- Outcome
- xylem sap ABA concentrationse0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato xylem sap ABA concentrations were unaffected by the presence of neighbours”
t0“lettuce and tomato plants”
Claim · model-written summary
Competing plants showed soil and xylem sap alkalization.
- Taxon
- plantsViridiplantaee0
- Outcome
- soil and xylem sap alkalizatione0
Verbatim
e0“soil and xylem sap alkalization was observed in competing plants”
t0“lettuce and tomato plants”
Claim · model-written summary
Competition modulated leaf ethylene production.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Competitione0
- Outcome
- leaf ethylene productione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Competition also modulated leaf ethylene production”
t0“lettuce and tomato plants”
Claim · model-written summary
Ethylene perception inhibition diminished the conductance difference between single and competing lettuce in a controlled environment room.
- Taxon
- lettuceLactuca sativae0
- Treatment
- 1-methylcyclopropenee0
- Outcome
- difference in g(s)e0
- Direction
- diminishede0
- Comparator
- single and competing plantse0
- Setting
- controlled environment roome0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“treatment of lettuce plants with an ethylene perception inhibitor (1-methylcyclopropene) diminished the difference in g(s) between single and competing plants grown in a controlled environment room”
t0“lettuce and tomato plants”
Claim · model-written summary
Ethylene perception inhibition increased the conductance difference between single and competing lettuce in a greenhouse.
- Taxon
- lettuceLactuca sativat0
- Treatment
- 1-methylcyclopropenee2
- Outcome
- difference in g(s)e1
- Direction
- increasede0
- Setting
- greenhousee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but increased it in plants grown in the greenhouse”
e1“difference in g(s) between single and competing plants”
e2“treatment of lettuce plants with an ethylene perception inhibitor (1-methylcyclopropene) diminished the difference in g(s) between single and competing plants grown in a controlled environment room”
t0“lettuce and tomato plants”
The same questions in other papers
competition · molecular: metabolites · Solanum lycopersicum (tomato)Positive and negative results
1 in the opposite direction
- positive
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.