Abstract
Illumination of dark-grown barley plants induces a massive insertion of the light-harvesting chlorophyll a/b protein into the developing thylakoid membrane. In addition to the onset of chlorophyll synthesis, light induces specifically the appearance of a prominent mRNA species which codes for a polypeptide of Mr 29500. This component was identified as a precursor of the apoprotein of the light-harvesting chlorophyll a/b protein. The precursor has an Mr larger than the authentic protein by approximately 4000. Studies of the chlorophyll-b-less mutant chlorina f2 of barley offer the first clue to the mechanism which controls the light-dependent mRNA formation. The induction of the mRNA coding for the aproprotein of the light-harvesting chlorophyll a/b protein does not seem to be linked directly to the assembly process of the light-harvesting structure and does not require chlorophyll b. It is proposed that light exerts its influence on the mRNA formation by a reaction which is different from the phototransformation of protochlorophyll(ide) to chlorophyll(ide).
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Claims 8
Claim · model-written summary
Illumination induced massive insertion of light-harvesting chlorophyll a/b protein into developing thylakoids.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Organ / stage
- developing thylakoid membranee0
- Treatment
- Illuminatione0
- Outcome
- insertion of the light-harvesting chlorophyll a/b proteine0
- Direction
- inducese0
- Comparator
- dark-growne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Illumination of dark-grown barley plants induces a massive insertion of the light-harvesting chlorophyll a/b protein into the developing thylakoid membrane”
Claim · model-written summary
Light induced chlorophyll synthesis.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- lighte0
- Outcome
- chlorophyll synthesise0
- Direction
- onsete0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the onset of chlorophyll synthesis, light induces specifically the appearance”
t0“Barley”
Claim · model-written summary
Light induced a prominent mRNA species coding for a Mr 29500 polypeptide.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- lighte0
- Outcome
- appearance of a prominent mRNA speciese0
- Direction
- inducese0
- Value
- Mr 29500e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light induces specifically the appearance of a prominent mRNA species which codes for a polypeptide of Mr 29500”
t0“Barley”
Claim · model-written summary
The polypeptide was identified as a precursor of the light-harvesting chlorophyll a/b apoprotein.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- precursor of the apoprotein of the light-harvesting chlorophyll a/b proteine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This component was identified as a precursor of the apoprotein of the light-harvesting chlorophyll a/b protein”
t0“Barley”
Claim · model-written summary
The precursor had Mr approximately 4000 greater than the authentic protein.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- Mre0
- Direction
- largere0
- Value
- approximately 4000e0
- Comparator
- authentic proteine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The precursor has an Mr larger than the authentic protein by approximately 4000”
t0“Barley”
Claim · model-written summary
Induction of the mRNA was not directly linked to assembly of the light-harvesting structure.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- induction of the mRNAe0
- Qualifier
- does not seem to be linked directly to the assembly processe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The induction of the mRNA coding for the aproprotein of the light-harvesting chlorophyll a/b protein does not seem to be linked directly to the assembly process of the light-harvesting structure”
t0“Barley”
Claim · model-written summary
Induction of that mRNA did not require chlorophyll b.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- chlorophyll be0
- Qualifier
- does not requiree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“does not require chlorophyll b”
t0“Barley”
Claim · model-written summary
The authors proposed that light affects mRNA formation through a reaction distinct from protochlorophyllide phototransformation.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- lighte0
- Outcome
- mRNA formatione0
- Qualifier
- a reaction which is different from the phototransformation of protochlorophyll(ide) to chlorophyll(ide)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is proposed that light exerts its influence on the mRNA formation by a reaction which is different from the phototransformation of protochlorophyll(ide) to chlorophyll(ide)”
t0“Barley”
The same questions in other papers
light · physiology: pigments · Hordeum vulgare (barley)Positive and negative results
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- no effect
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- no effect
- positive
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See all 24 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.