Abstract
An alternating light-dark system is described under which etiolated bean (Phaseolus vulgaris) leaves form selectively chlorophyll a.This system consists of cycles of 2 minutes of white light alternating with 98-minute dark periods.Etiolated tissue exposed to a series of such light-dark cycles accumulates chlorophyll a predominantly, with no lag phase in its biosynthesis. A very high ratio of chlorophyll a:chlorophyll b is thus established. The ratio increases with the number of light exposures up to about 45 such exposures and then it declines. Transfer of the etiolated tissue to continuous illumination after a number of such light exposures results in a dramatic drop of the chlorophyll a:chlorophyll b ratio to values normally found in green plants.
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Claims 5
Claim · model-written summary
Alternating light and darkness led etiolated bean leaves to form chlorophyll a selectively.
Not reportedComparatorDirection
Verbatim
e0“An alternating light-dark system is described under which etiolated bean (Phaseolus vulgaris) leaves form selectively chlorophyll a.”
Claim · model-written summary
Under light-dark cycles, etiolated tissue accumulated predominantly chlorophyll a without a biosynthetic lag phase.
- Taxon
- beant0
- Treatment
- light-dark cyclese0
- Outcome
- accumulates chlorophyll a predominantlye0
- Direction
- accumulatese0
- Qualifier
- no lag phase in its biosynthesise0
Not reportedComparator
Verbatim
e0“Etiolated tissue exposed to a series of such light-dark cycles accumulates chlorophyll a predominantly, with no lag phase in its biosynthesis.”
t0“Bean Plants”
Claim · model-written summary
The chlorophyll a:b ratio increased through about 45 exposures and then declined.
Verbatim
e0“The ratio increases with the number of light exposures up to about 45 such exposures and then it declines.”
t0“Bean Plants”
Claim · model-written summary
After about 45 light exposures, the ratio declined.
Verbatim
e0“The ratio increases with the number of light exposures up to about 45 such exposures and then it declines.”
t0“Bean Plants”
Claim · model-written summary
Continuous illumination after light-dark cycles sharply decreased the chlorophyll a:b ratio to normal green-plant values.
Verbatim
e0“Transfer of the etiolated tissue to continuous illumination after a number of such light exposures results in a dramatic drop of the chlorophyll a:chlorophyll b ratio to values normally found in green plants.”
t0“Bean Plants”
The same questions in other papers
light · physiology: pigments · Phaseolus vulgaris (common bean)Positive and negative results
9 papers in the same direction as this paper · 3 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- negative
10 papers more in this group
See all 14 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.