Abstract
O(3)could reduce growth and carbohydrate allocation to roots by direct inhibition of photosynthesis and source strength. Alternatively, O(3) could reduce growth indirectly by inhibition of root hydraulic development through a primary lesion in carbohydrate translocation. Another alternative is that O(3) could slow the rate of plant development, only apparently altering carbohydrate allocation at a given plant age. Pima cotton (Gossypium barbadense L.) is used to address these possibilities, and four hypotheses were tested/ (1) O(3) exposure reduces leaf pools of soluble sugars; (2) pruning leaf area and reducing source strength to match that of O(3)-treated plants reproduces O(3)-effects; (3) pruning lower leaf area more closely reproduces O(3) effects than pruning upper leaf area; and (4) manipulating plant age and thereby plant size to match O(3)-treated plants reproduces O(3)-effects. All were falsified. Soluble sugars did not decline. Pruning upper and lower leaves and manipulating plant age all reduced biomass and leaf area similarly to O(3)-exposure, but neither reproduced O(3) effects on biomass allocation nor root function. It is concluded that O(3) induces an allometric shift in carbohydrate allocation that is not mediated by photosynthetic inhibition nor by alteration of developmental age. Effects of O(3) could be mediated by direct effects on phloem loading, with consequent inhibition of translocation to roots and root system development.
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Claims 6
Claim · model-written summary
Ozone exposure did not reduce leaf pools of soluble sugars in Pima cotton.
- Taxon
- Pima cotton (Gossypium barbadense L.)
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Gossypium barbadensee0 - Treatment
- O(3) exposuree1
- Outcome
- Soluble sugarse2
- Direction
- did not declinee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Pima cotton (Gossypium barbadense L.) is used to address these possibilities”
e1“(1) O(3) exposure reduces leaf pools of soluble sugars”
e2“Soluble sugars did not decline”
Claim · model-written summary
Pruning upper and lower leaves reduced biomass and leaf area in Pima cotton similarly to ozone exposure.
- Taxon
- Pima cotton (Gossypium barbadense L.)Gossypium barbadensee0
- Treatment
- Pruning upper and lower leavese3
- Outcome
- biomass and leaf areae3
- Direction
- reducede3
- Comparator
- O(3)-exposuree3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pima cotton (Gossypium barbadense L.) is used to address these possibilities”
e3“Pruning upper and lower leaves and manipulating plant age all reduced biomass and leaf area similarly to O(3)-exposure”
Claim · model-written summary
Manipulating plant age reduced biomass and leaf area in Pima cotton similarly to ozone exposure.
- Taxon
- Pima cotton (Gossypium barbadense L.)Gossypium barbadensee0
- Treatment
- manipulating plant agee3
- Outcome
- biomass and leaf areae3
- Direction
- reducede3
- Comparator
- O(3)-exposuree3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pima cotton (Gossypium barbadense L.) is used to address these possibilities”
e3“Pruning upper and lower leaves and manipulating plant age all reduced biomass and leaf area similarly to O(3)-exposure”
Claim · model-written summary
Neither pruning nor plant-age manipulation reproduced the ozone effects on biomass allocation or root function in Pima cotton.
- Taxon
- Pima cotton (Gossypium barbadense L.)Gossypium barbadensee0
- Treatment
- Pruning upper and lower leaves and manipulating plant agee3
- Outcome
- biomass allocation nor root functione4
- Direction
- neither reproducede4
- Comparator
- O(3)e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pima cotton (Gossypium barbadense L.) is used to address these possibilities”
e3“Pruning upper and lower leaves and manipulating plant age all reduced biomass and leaf area similarly to O(3)-exposure”
e4“neither reproduced O(3) effects on biomass allocation nor root function”
Claim · model-written summary
Ozone induces an allometric shift in carbohydrate allocation in Pima cotton that is not mediated by photosynthetic inhibition or by altered developmental age.
- Taxon
- Pima cotton (Gossypium barbadense L.)Gossypium barbadensee0
- Treatment
- O(3)e5
- Outcome
- allometric shift in carbohydrate allocatione5
- Qualifier
- not mediated by photosynthetic inhibition nor by alteration of developmental agee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pima cotton (Gossypium barbadense L.) is used to address these possibilities”
e5“It is concluded that O(3) induces an allometric shift in carbohydrate allocation that is not mediated by photosynthetic inhibition nor by alteration of developmental age”
Claim · model-written summary
Ozone effects on root system development in Pima cotton may be mediated by direct effects on phloem loading.
- Taxon
- Pima cotton (Gossypium barbadense L.)Gossypium barbadensee0
- Treatment
- O(3)e6
- Outcome
- root system developmente6
- Qualifier
- direct effects on phloem loadinge6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pima cotton (Gossypium barbadense L.) is used to address these possibilities”
e6“Effects of O(3) could be mediated by direct effects on phloem loading, with consequent inhibition of translocation to roots and root system development”
The same questions in other papers
stage · growth · Gossypium barbadense (Egyptian cotton)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.