Abstract
NaCl and KCl enhanced the degradation of chlorophylls and proteins in detached rice (Oryza sativa) leaves in a concentration-dependent manner. Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) accounted for 73 to 80% of the protein lost by day 4 in the light. NaCl at 50 millimolar increased proteolysis by 21% over the control in 4 days, but the addition of cycloheximide reduced the increase to about one-half. Cycloheximide alone had no effect on proteolytic activity during this period. Leaf segments taken from 10-day-old seedlings contained the highest proteolytic activity. Both NaCl and KCl increased the activity of Rubisco-degrading endoproteinases (the amount of ninhydrin-positive compounds measured from HCl-hydrolyzates of trichloroacetic acid-soluble supernatant), but decreased the activity of hemoglobin- and Rubisco-degrading exoproteinases (the amount of ninhydrin-positive compounds measured directly from trichloroacetic acid-soluble supernatant). Efflux of amino acids from senescing leaf segments into the incubation media increased 7- and 12-fold in the presence of KCl and NaCl, respectively. The increased efflux resulted in a negative correlation between salt concentration and amino acid content of leaf segments at the later stage of senescence. It is concluded that, in addition to the induction of new proteinase synthesis, the increased efflux of protein hydrolyzates may play a significant role in increasing proteolysis of salt-treated leaves, especially at the later stages of senescence.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 14
Claim · model-written summary
NaCl enhanced chlorophyll and protein degradation in rice leaves with concentration.
- Taxon
- rice (Oryza sativa)
Oryza sativae0 - Organ / stage
- detached rice (Oryza sativa) leavese0
- Treatment
- NaCle0
- Outcome
- degradation of chlorophylls and proteinse0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl and KCl enhanced the degradation of chlorophylls and proteins in detached rice (Oryza sativa) leaves in a concentration-dependent manner.”
Claim · model-written summary
KCl enhanced chlorophyll and protein degradation in rice leaves with concentration.
- Taxon
- rice (Oryza sativa)Oryza sativae0
- Treatment
- KCle0
- Outcome
- degradation of chlorophylls and proteinse0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl and KCl enhanced the degradation of chlorophylls and proteins in detached rice (Oryza sativa) leaves in a concentration-dependent manner.”
Claim · model-written summary
Rubisco accounted for 73 to 80% of protein lost by day four in light.
- Taxon
- rice (Oryza sativa)Oryza sativae1
- Gene
- Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco)e0
- Outcome
- protein loste0
- Value
- 73 to 80%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) accounted for 73 to 80% of the protein lost by day 4 in the light.”
e1“rice (Oryza sativa) leaves”
Claim · model-written summary
50 mM NaCl increased proteolysis by 21% over control in four days.
- Taxon
- rice (Oryza sativa)Oryza sativae1
- Treatment
- NaCl at 50 millimolare0
- Outcome
- proteolysise0
- Direction
- increasede0
- Value
- 21%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl at 50 millimolar increased proteolysis by 21% over the control in 4 days”
e1“rice (Oryza sativa) leaves”
Claim · model-written summary
Adding cycloheximide halved the NaCl-induced proteolysis increase.
- Taxon
- rice (Oryza sativa)Oryza sativae2
- Treatment
- addition of cycloheximidee0
- Outcome
- increasee0
- Direction
- reducede0
- Value
- about one-halfe0
- Comparator
- NaCl at 50 millimolare1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the addition of cycloheximide reduced the increase to about one-half”
e1“NaCl at 50 millimolar increased proteolysis”
e2“rice (Oryza sativa) leaves”
Claim · model-written summary
Cycloheximide alone did not affect proteolytic activity.
- Taxon
- rice (Oryza sativa)Oryza sativae1
- Treatment
- Cycloheximide alonee0
- Outcome
- proteolytic activitye0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cycloheximide alone had no effect on proteolytic activity during this period.”
e1“rice (Oryza sativa) leaves”
Claim · model-written summary
Leaf segments of ten-day seedlings had highest proteolytic activity.
- Taxon
- rice (Oryza sativa)Oryza sativae1
- Organ / stage
- 10-day-old seedlingse0
- Outcome
- proteolytic activitye0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf segments taken from 10-day-old seedlings contained the highest proteolytic activity.”
e1“rice (Oryza sativa) leaves”
Claim · model-written summary
NaCl increased Rubisco-degrading endoproteinase activity.
- Taxon
- rice (Oryza sativa)Oryza sativae1
- Treatment
- NaCle0
- Outcome
- activity of Rubisco-degrading endoproteinasese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both NaCl and KCl increased the activity of Rubisco-degrading endoproteinases”
e1“rice (Oryza sativa) leaves”
Claim · model-written summary
KCl increased Rubisco-degrading endoproteinase activity.
- Taxon
- rice (Oryza sativa)Oryza sativae1
- Treatment
- KCle0
- Outcome
- activity of Rubisco-degrading endoproteinasese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both NaCl and KCl increased the activity of Rubisco-degrading endoproteinases”
e1“rice (Oryza sativa) leaves”
Claim · model-written summary
NaCl decreased hemoglobin- and Rubisco-degrading exoproteinase activity.
- Taxon
- rice (Oryza sativa)Oryza sativae1
- Treatment
- NaCle0
- Outcome
- activity of hemoglobin- and Rubisco-degrading exoproteinasese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both NaCl and KCl increased the activity of Rubisco-degrading endoproteinases (the amount of ninhydrin-positive compounds measured from HCl-hydrolyzates of trichloroacetic acid-soluble supernatant), but decreased the activity of hemoglobin- and Rubisco-degrading exoproteinases”
e1“rice (Oryza sativa) leaves”
Claim · model-written summary
KCl decreased hemoglobin- and Rubisco-degrading exoproteinase activity.
- Taxon
- rice (Oryza sativa)Oryza sativae1
- Treatment
- KCle0
- Outcome
- activity of hemoglobin- and Rubisco-degrading exoproteinasese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both NaCl and KCl increased the activity of Rubisco-degrading endoproteinases (the amount of ninhydrin-positive compounds measured from HCl-hydrolyzates of trichloroacetic acid-soluble supernatant), but decreased the activity of hemoglobin- and Rubisco-degrading exoproteinases”
e1“rice (Oryza sativa) leaves”
Claim · model-written summary
KCl increased amino acid efflux sevenfold.
- Taxon
- rice (Oryza sativa)Oryza sativae1
- Treatment
- KCle0
- Outcome
- Efflux of amino acids from senescing leaf segmentse0
- Direction
- increasede0
- Value
- 7-e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Efflux of amino acids from senescing leaf segments into the incubation media increased 7- and 12-fold in the presence of KCl and NaCl, respectively.”
e1“rice (Oryza sativa) leaves”
Claim · model-written summary
NaCl increased amino acid efflux twelvefold.
- Taxon
- rice (Oryza sativa)Oryza sativae1
- Treatment
- NaCle0
- Outcome
- Efflux of amino acids from senescing leaf segmentse0
- Direction
- increasede0
- Value
- 12-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Efflux of amino acids from senescing leaf segments into the incubation media increased 7- and 12-fold in the presence of KCl and NaCl, respectively.”
e1“rice (Oryza sativa) leaves”
Claim · model-written summary
Salt concentration negatively correlated with leaf-segment amino acid content late in senescence.
- Taxon
- rice (Oryza sativa)Oryza sativae1
- Treatment
- salt concentratione0
- Outcome
- amino acid content of leaf segmentse0
- Direction
- negative correlatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“negative correlation between salt concentration and amino acid content of leaf segments at the later stage of senescence”
e1“rice (Oryza sativa) leaves”
The same questions in other papers
potassium chloride · molecular: metabolites · Oryza sativa (rice)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
sodium chloride · physiology: photosynthesis · Oryza sativa (rice)Positive and negative results
21 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
19 papers more in this group
See all 23 papers →sodium chloride · molecular: metabolites · Oryza sativa (rice)Positive and negative results
23 papers in the same direction as this paper · 14 in the opposite direction
- positive
- positive
- positive
34 papers more in this group
See all 38 papers →potassium chloride · physiology: photosynthesis · Oryza sativa (rice)Results agree
2 papers in the same direction as this paper
- negative
- negative
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.