Abstract
Chloroplast protein synthesis was measured during the expansion, maturity and senescence of the oldest leaf of barley, Hordeum vulgare L., var. Hassan. A maximum rate of protein synthesis occurred near the end of the expansion stage 9 d after sowing. Protein synthesis increased again at the beginning of senescence and reached a new maximum at day 14 after sowing. Detachment and incubation of leaves in the dark stimulated chioroplast protein synthesis by fully expanded or by senescent leaves but not by expanding leaves. If the detached leaves were kept in the light, chloroplast protein synthesis was stimulated in fully expanded but not in senescent leaves. Short treatments (18 h) of leaf segments with growth substances in either light or in darkness, significantly changed the rate of protein synthesis shown by chloroplasts. The relationship between chloroplast protein synthesis and leaf senescence is discussed.
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Claims 7
Claim · model-written summary
Chloroplast protein synthesis peaked near the end of leaf expansion at day 9.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree1 - Material
- Hassane1
- Organ / stage
- expansion stagee0
- Outcome
- rate of protein synthesise0
- Direction
- maximume0
- Value
- 9 d after sowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“A maximum rate of protein synthesis occurred near the end of the expansion stage 9 d after sowing.”
e1“barley, Hordeum vulgare L., var. Hassan”
Claim · model-written summary
Protein synthesis rose at senescence onset and reached another maximum at day 14.
- Taxon
- barleyHordeum vulgaree1
- Organ / stage
- senescencee0
- Outcome
- Protein synthesise0
- Direction
- increasede0
- Value
- day 14 after sowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Protein synthesis increased again at the beginning of senescence and reached a new maximum at day 14 after sowing.”
e1“barley, Hordeum vulgare L., var. Hassan”
Claim · model-written summary
Dark incubation of detached leaves stimulated synthesis in fully expanded and senescent leaves.
- Taxon
- barleyHordeum vulgaree1
- Organ / stage
- fully expanded or by senescent leavese0
- Treatment
- Detachment and incubation of leaves in the darke0
- Outcome
- chioroplast protein synthesise0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Detachment and incubation of leaves in the dark stimulated chioroplast protein synthesis by fully expanded or by senescent leaves but not by expanding leaves.”
e1“barley, Hordeum vulgare L., var. Hassan”
Claim · model-written summary
Dark incubation of detached expanding leaves did not stimulate synthesis.
- Taxon
- barleyHordeum vulgaree1
- Organ / stage
- expanding leavese0
- Treatment
- Detachment and incubation of leaves in the darke0
- Outcome
- chioroplast protein synthesise0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Detachment and incubation of leaves in the dark stimulated chioroplast protein synthesis by fully expanded or by senescent leaves but not by expanding leaves.”
e1“barley, Hordeum vulgare L., var. Hassan”
Claim · model-written summary
Light incubation of detached leaves stimulated protein synthesis in fully expanded leaves.
- Taxon
- barleyHordeum vulgaree1
- Organ / stage
- fully expandede0
- Treatment
- detached leaves were kept in the lighte0
- Outcome
- chloroplast protein synthesise0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“If the detached leaves were kept in the light, chloroplast protein synthesis was stimulated in fully expanded but not in senescent leaves.”
e1“barley, Hordeum vulgare L., var. Hassan”
Claim · model-written summary
Light incubation of detached senescent leaves did not stimulate synthesis.
- Taxon
- barleyHordeum vulgaree1
- Organ / stage
- senescent leavese0
- Treatment
- detached leaves were kept in the lighte0
- Outcome
- chloroplast protein synthesise0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“If the detached leaves were kept in the light, chloroplast protein synthesis was stimulated in fully expanded but not in senescent leaves.”
e1“barley, Hordeum vulgare L., var. Hassan”
Claim · model-written summary
Growth substance treatment significantly changed synthesis rate in light or darkness.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- growth substancese0
- Outcome
- rate of protein synthesise0
- Value
- 18 he0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Short treatments (18 h) of leaf segments with growth substances in either light or in darkness, significantly changed the rate of protein synthesis shown by chloroplasts.”
e1“barley, Hordeum vulgare L., var. Hassan”
The same questions in other papers
light · quality: protein · Hordeum vulgare (barley)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- positive
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.