Abstract
Abstract— The role of the active form of phytochrome in Zea mays on the polyphosphoinositide cycle was studied. As little as 15 s of red irradiation of etiolated leaves immediately increased the level of phosphatidylinositol bisphosphate (PIP 2 ) 3–6‐fold compared to unirradiated leaves. The elevated level of PIP 2 decreased with longer red irradiations up to 5 min, but remained higher than in unirradiated leaves. The level of PIP 2 decreased if red irradiation was followed by far‐red irradiation. Far‐red alone had no effect. Levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol did not change significantly. Since red irradiation significantly changed PIP, but not PIP, photocontrol appears to be at the PIP kinase and phospholipase level. In related studies of the effect of light on phospholipids, 5 min of red irradiation induced significant decreases in phosphatidylcholine and phosphatidylethanola‐mine.
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Claims 7
Claim · model-written summary
Fifteen seconds of red light increased PIP 2 three- to six-fold over unirradiated leaves.
- Organ / stage
- etiolated leavese0
- Treatment
- 15 s of red irradiatione0
- Outcome
- level of phosphatidylinositol bisphosphate (PIP 2 )e0
- Direction
- increasede0
- Value
- 3–6‐folde0
- Comparator
- unirradiated leavese0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As little as 15 s of red irradiation of etiolated leaves immediately increased the level of phosphatidylinositol bisphosphate (PIP 2 ) 3–6‐fold compared to unirradiated leaves”
t0“Zea mays”
Claim · model-written summary
With longer red irradiation, elevated PIP 2 declined but stayed above unirradiated leaves.
- Treatment
- longer red irradiations up to 5 mine0
- Outcome
- level of PIP 2e0
- Direction
- decreasede0
- Comparator
- unirradiated leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The elevated level of PIP 2 decreased with longer red irradiations up to 5 min, but remained higher than in unirradiated leaves”
t0“Zea mays”
Claim · model-written summary
Far-red following red irradiation decreased PIP 2.
- Treatment
- red irradiation was followed by far‐red irradiatione0
- Outcome
- level of PIP 2e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The level of PIP 2 decreased if red irradiation was followed by far‐red irradiation”
t0“Zea mays”
Claim · model-written summary
Far-red irradiation alone had no effect on PIP 2.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Far‐red alone had no effect”
t0“Zea mays”
Claim · model-written summary
PIP and phosphatidylinositol levels did not change significantly.
- Outcome
- Levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositole0
- Direction
- did not changee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol did not change significantly”
t0“Zea mays”
Claim · model-written summary
Photocontrol appeared to occur at PIP kinase and phospholipase.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photocontrol appears to be at the PIP kinase and phospholipase level”
t0“Zea mays”
Claim · model-written summary
Five minutes of red light significantly decreased phosphatidylcholine and phosphatidylethanolamine.
- Treatment
- 5 min of red irradiatione0
- Outcome
- phosphatidylcholine and phosphatidylethanola‐minee0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“5 min of red irradiation induced significant decreases in phosphatidylcholine and phosphatidylethanola‐mine”
t0“Zea mays”
The same questions in other papers
radiation · molecular: metabolites · Zea mays (maize)Positive and negative results
5 papers in the same direction as this paper · 5 in the opposite direction
- no effect
- negative
- negative
7 papers more in this group
See all 11 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.