Abstract
The effect of light intensity on primary bean leaf unfolding and elongation was studied with intact and excised 10-day-old plants grown under red light. Continuous light of 40 μmol; m −2 S −1 was enough to induce maximal leaf expansion both on intact and excised bean plants. Lower light intensities had a partial effect. The growth rate during the first 24 h in light was linearly related to light intensity up to 130 μmol; m −2 S −1 , although this light intensity was already supra-optimal for final leaf size. The minimal amount of light energy needed for full leaf expansion was about 15 mol photons m −2 . The mode of light application, level of intensity, and irradiance duration were not critical when the total energy requirement was fulfilled. Under insufficient light applications for full leaf expansion, interrupted irradiance and longer low light intensity application induced leaf elongation more efficiently. Generally, the effect of different white light intensities on primary bean leaf expansion was the same on both intact and excised red-light-grown plants.
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Claims 9
Claim · model-written summary
Continuous light at 40 μmol; m −2 S −1 induced maximal expansion on intact and excised plants.
- Taxon
- bean plantse0
- Treatment
- Continuous light of 40 μmol; m −2 S −1e0
- Outcome
- leaf expansione0
- Direction
- maximale0
- Value
- 40 μmol; m −2 S −1e0
Not reportedComparator
Verbatim
e0“Continuous light of 40 μmol; m −2 S −1 was enough to induce maximal leaf expansion both on intact and excised bean plants.”
Claim · model-written summary
Lower light intensities had only a partial effect on leaf expansion.
- Taxon
- BEAN PLANTSt0
- Treatment
- Lower light intensitiese0
- Outcome
- partial effecte0
- Direction
- partial effecte0
Not reportedComparator
Verbatim
e0“Lower light intensities had a partial effect.”
t0“BEAN PLANTS”
Claim · model-written summary
Growth rate over the first 24 hours rose linearly with light intensity up to 130 μmol; m −2 S −1.
- Taxon
- BEAN PLANTSt0
- Treatment
- light intensitye0
- Outcome
- growth ratee0
- Value
- 130 μmol; m −2 S −1e0
- Qualifier
- first 24 h in lighte0
Not reportedDirection
Verbatim
e0“The growth rate during the first 24 h in light was linearly related to light intensity up to 130 μmol; m −2 S −1”
t0“BEAN PLANTS”
Claim · model-written summary
An intensity of 130 μmol; m −2 S −1 was supra optimal for final leaf size.
Verbatim
e0“this light intensity was already supra-optimal for final leaf size.”
t0“BEAN PLANTS”
Claim · model-written summary
Full leaf expansion required about 15 mol photons m −2.
Verbatim
e0“The minimal amount of light energy needed for full leaf expansion was about 15 mol photons m −2 .”
t0“BEAN PLANTS”
Claim · model-written summary
Light application mode, intensity and duration were not critical after the energy requirement was met.
Verbatim
e0“The mode of light application, level of intensity, and irradiance duration were not critical when the total energy requirement was fulfilled.”
t0“BEAN PLANTS”
Claim · model-written summary
With insufficient total light, interrupted irradiance increased leaf elongation efficiency.
- Taxon
- BEAN PLANTSt0
- Treatment
- interrupted irradiancee0
- Outcome
- leaf elongatione0
- Direction
- more efficientlye0
- Qualifier
- Under insufficient light applications for full leaf expansione0
Not reportedComparator
Verbatim
e0“Under insufficient light applications for full leaf expansion, interrupted irradiance and longer low light intensity application induced leaf elongation more efficiently.”
t0“BEAN PLANTS”
Claim · model-written summary
With insufficient total light, longer low intensity application increased leaf elongation efficiency.
- Taxon
- BEAN PLANTSt0
- Treatment
- longer low light intensity applicatione0
- Outcome
- leaf elongatione0
- Direction
- more efficientlye0
Not reportedComparator
Verbatim
e0“Under insufficient light applications for full leaf expansion, interrupted irradiance and longer low light intensity application induced leaf elongation more efficiently.”
t0“BEAN PLANTS”
Claim · model-written summary
White light intensities affected primary leaf expansion similarly in intact and excised red light grown bean plants.
Verbatim
e0“Generally, the effect of different white light intensities on primary bean leaf expansion was the same on both intact and excised red-light-grown plants.”
The same questions in other papers
light · growth · Phaseolus vulgaris (common bean)Positive and negative results
28 papers in the same direction as this paper · 9 in the opposite direction · 3 reporting no difference from an alternative
- no effect
- negative
- negative
37 papers more in this group
See all 41 papers →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.