Claim · model-written summary
During ageing, upper-surface stomatal resistance increases before lower-surface resistance.
- Taxon
- cotton
Gossypium hirsutume1 - Outcome
- stomatal resistance of the upper surfacee0
- Direction
- increasese0
- Comparator
- lower surfacee0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During ageing of leaves the stomatal resistance of the upper surface increases before that of the lower surface.”
e1“cotton leaves ( Gossypium hirsutum )”
Title
The Relation between Photosynthesis and Stomatal Resistance of Each Leaf Surface in Cotton Leaves
S. NAGARAJAH Physiologia Plantarum 1975. doi:10.1111/j.1399-3054.1975.tb01857.x
Other claims from this paper (10)
- Observation Upper-surface stomata may begin ageing before lower-surface stomata.
- Association At an early ageing stage, declining photosynthesis is negatively correlated with upper-surface stomatal resistance.
- Association At an early ageing stage, declining photosynthesis is not related to lower-surface stomatal resistance.
- Mechanism The initial decrease in photosynthesis and increase in upper-surface resistance occur simultaneously without a causal relation.
- Association At advanced ageing, lower-surface resistance increases and declining photosynthesis becomes related to resistance of both surfaces.
- Association Increasing illumination stepwise increases photosynthesis in relation to reduced resistance on each leaf surface.
- Observation At low light, lower-surface stomatal resistance is low while upper-surface resistance is relatively high.
- Association The resistance difference between surfaces decreases as light intensity increases.
- Observation Upper stomata appear to need higher light intensity to open than lower stomata.
- Association Stomatal resistance on both leaf surfaces is unrelated to stomatal frequency.