Claim · model-written summary
Stem elongation was completely inhibited at temperature regimes below 63/73 F.
- Taxon
- Scrophularia Marilandica
Scrophularia marilandicat0 - Treatment
- temperature regimes below 63°/73°Fe0
- Outcome
- Stem elongatione0
- Direction
- inhibitede0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stem elongation was completely inhibited at temperature regimes below 63°/73°F”
t0“Scrophularia Marilandica”
Title
Effects of Temperature and Light Intensity on the Growth of Scrophularia Marilandica
Morris G. Cline Ecology 1966. doi:10.2307/1934265
Other claims from this paper (19)
- Association In growth rooms, net assimilation rate was proportional to light intensity up to 123 cal/cm2/day.
- Association In semi-natural studies, net assimilation rate was proportional to light up to 150 cal/cm2/day.
- Association In semi-natural studies, from 150 up to 300 cal/cm2/day net assimilation rate increased but not proportionally.
- Intervention effect Above 300 cal/cm2/day net assimilation rate was independent of solar radiation.
- Association Under controlled conditions net assimilation rate decreased slightly with age at the highest light levels.
- Intervention effect Vegetative phase length, specific leaf area and leaf-area ratio decreased sharply at higher light intensities.
- Intervention effect Dry weight of all plant organs was increased by high light intensities.
- Observation Roots and axillary shoots were especially sensitive to light intensity.
- Association In growth-room experiments, temperature effects were more pronounced than light effects.
- Intervention effect Leaf expansion was markedly diminished below 57/68 F.
- Intervention effect As a consequence of low temperature the shoot developed a rosette habit and flowering was inhibited.
- Intervention effect Decreasing temperature to 48/58 F had little effect on root growth.
- Intervention effect The net effect of low temperatures was to depress the shoot-root ratio.
- Intervention effect Net assimilation rate was increased by lowering temperature from 63/73 to 48/58 at all light intensities.
- Intervention effect The shoot-root ratio of shaded plants was increased more by a rise in temperature than that of unshaded plants.
- Intervention effect Inhibition of stem elongation and subsequent rosette development at low temperatures was not affected by changes in light intensity.
- Intervention effect The usual development of greater leaf areas under lower light intensities was partially reversed at low temperatures.
- Mechanism The timing differential between leaf expansion in April and shoot elongation in May appears to be a temperature-photoperiod interaction.
- Observation Roots increased greatly in size through late summer into early autumn.