Claim · model-written summary
The shoot-root ratio of shaded plants was increased more by a rise in temperature than that of unshaded plants.
- Taxon
- Scrophularia Marilandica
Scrophularia marilandicat0 - Material
- shaded plantse0
- Treatment
- a rise in temperaturee0
- Outcome
- shoot—root ratioe0
- Direction
- increased to a greater extente0
- Comparator
- unshaded plantse0
Not reportedGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The shoot—root ratio of shaded plants was increased to a greater extent by a rise in temperature than was that of the unshaded plants”
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 Stem elongation was completely inhibited at temperature regimes below 63/73 F.
- 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 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.