Abstract
The catalytic direction of pyrophosphate:fructose‐6‐phosphate 1‐phosphotransferase (PFP; EC 2.7.1.90) in coleoptiles of rice ( Oryza sativa L.) seedlings subjected to anoxia stress is discussed. The stress greatly induced ethanol synthesis and increased activities of alcohol dehydrogenase (ADH; EC 1.1.1.1) and pyruvate decarboxylase (PDC; EC 4.1.1.1) in the coleoptiles, whereas the elevated PDC activity was much lower than the elevated ADH activity, suggesting that PDC may be one of the limiting factors for ethanolic fermentation in rice coleoptiles. Anoxic stress decreased concentrations of fructose 6‐phosphate (Fru‐6‐P) and glucose 6‐phosphate, and increased concentration of fructose 1,6‐bisphosphate (Fru‐1,6‐bisP) in the coleoptiles. PFP activity in rice coleoptiles was low in an aerobic condition and increased during the stress, whereas no significant increase was found in ATP:fructose‐6‐phosphate 1‐phosphotransferase (PFK; EC 2.7.1.11) activity in stressed coleoptiles. Fructose 2,6‐bisphosphate concentration in rice coleoptiles was increased by the stress and pyrophosphate concentration was above the K m for the forward direction of PFP and was sufficient to inhibit the reverse direction of PFP. Under stress conditions the potential of carbon flux from Fru‐6‐P toward ethanol through PFK may be much lower than the potential of carbon flux from pyruvate toward ethanol through PDC. These results suggest that PFP may play an important role in maintaining active glycolysis and ethanolic fermentation in rice coleoptiles in anoxia.
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Claims 7
Claim · model-written summary
Anoxia greatly induced ethanol synthesis in rice coleoptiles.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- coleoptilest0
- Treatment
- anoxiat0
- Outcome
- ethanol synthesise0
- Direction
- greatly inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice coleoptiles in anoxia”
e0“The stress greatly induced ethanol synthesis and increased activities of alcohol dehydrogenase (ADH; EC 1.1.1.1) and pyruvate decarboxylase (PDC; EC 4.1.1.1) in the coleoptiles”
Claim · model-written summary
Anoxia increased activities of alcohol dehydrogenase (ADH; EC 1.1.1.1) and pyruvate decarboxylase (PDC; EC 4.1.1.1) in rice coleoptiles.
- Taxon
- riceOryza sativat0
- Organ / stage
- coleoptilest0
- Treatment
- anoxiat0
- Outcome
- activities of alcohol dehydrogenase (ADH; EC 1.1.1.1) and pyruvate decarboxylase (PDC; EC 4.1.1.1)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice coleoptiles in anoxia”
e0“The stress greatly induced ethanol synthesis and increased activities of alcohol dehydrogenase (ADH; EC 1.1.1.1) and pyruvate decarboxylase (PDC; EC 4.1.1.1) in the coleoptiles”
Claim · model-written summary
Anoxia decreased concentrations of fructose 6‐phosphate (Fru‐6‐P) and glucose 6‐phosphate in rice coleoptiles.
- Taxon
- riceOryza sativat0
- Organ / stage
- coleoptilest0
- Treatment
- anoxiat0
- Outcome
- concentrations of fructose 6‐phosphate (Fru‐6‐P) and glucose 6‐phosphatee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice coleoptiles in anoxia”
e0“Anoxic stress decreased concentrations of fructose 6‐phosphate (Fru‐6‐P) and glucose 6‐phosphate”
Claim · model-written summary
Anoxia increased concentration of fructose 1,6‐bisphosphate (Fru‐1,6‐bisP) in rice coleoptiles.
- Taxon
- riceOryza sativat0
- Organ / stage
- coleoptilest0
- Treatment
- anoxiat0
- Outcome
- concentration of fructose 1,6‐bisphosphate (Fru‐1,6‐bisP)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice coleoptiles in anoxia”
e0“increased concentration of fructose 1,6‐bisphosphate (Fru‐1,6‐bisP) in the coleoptiles”
Claim · model-written summary
Anoxia increased PFP activity in rice coleoptiles.
- Taxon
- riceOryza sativat0
- Organ / stage
- coleoptilest0
- Treatment
- anoxiat0
- Outcome
- PFP activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice coleoptiles in anoxia”
e0“PFP activity in rice coleoptiles was low in an aerobic condition and increased during the stress”
Claim · model-written summary
Anoxia no significant increase ATP:fructose‐6‐phosphate 1‐phosphotransferase (PFK; EC 2.7.1.11) activity in rice coleoptiles.
- Taxon
- riceOryza sativat0
- Organ / stage
- coleoptilest0
- Treatment
- anoxiat0
- Outcome
- ATP:fructose‐6‐phosphate 1‐phosphotransferase (PFK; EC 2.7.1.11) activitye0
- Direction
- no significant increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice coleoptiles in anoxia”
e0“no significant increase was found in ATP:fructose‐6‐phosphate 1‐phosphotransferase (PFK; EC 2.7.1.11) activity in stressed coleoptiles”
Claim · model-written summary
Anoxia increased Fructose 2,6‐bisphosphate concentration in rice coleoptiles.
- Taxon
- riceOryza sativat0
- Organ / stage
- coleoptilest0
- Treatment
- anoxiat0
- Outcome
- Fructose 2,6‐bisphosphate concentratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice coleoptiles in anoxia”
e0“Fructose 2,6‐bisphosphate concentration in rice coleoptiles was increased by the stress”
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See all 46 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.