Abstract
To compare with the case of phosphorylation, ATP hydrolysis was investigated in thylakoids from plants submitted to drought. For medium stresses the relationship between hydrolysis rate and deactivation constant of the de-energized enzyme when delta pH varies is unchanged, hence the basic mechanisms are preserved; (PS1-driven) energization than is neither affected, at any light intensity. As drought intensifies, hydrolysis and monogalactolipids fall somewhat in parallel, whereas the deactivation constant changes with digalactolipids and phosphatidic acid content. This alteration of the F0 lipid environment must be transduced to F1, the subunits of which, however, are preserved, as shown by LDS-PAGE. ATP synthesis (thiol-oxidized enzyme) and hydrolysis (thiol-reduced enzyme) show an identical decrease with stress. Thus the latter impairs a common early step, probably the activation of the oxidized enzyme.
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Claims 7
Claim · model-written summary
Relationship between ATP hydrolysis rate and deactivation constant was unchanged under medium stresses
- Treatment
- medium stressese0
- Outcome
- relationship between hydrolysis rate and deactivation constante0
- Direction
- unchangede0
LupinusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lupin”
e0“For medium stresses the relationship between hydrolysis rate and deactivation constant of the de-energized enzyme when delta pH varies is unchanged”
Claim · model-written summary
Energization of thylakoids was not affected at any light intensity
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lupin”
e1“(PS1-driven) energization than is neither affected, at any light intensity”
Claim · model-written summary
Hydrolysis and monogalactolipids fell somewhat in parallel as drought intensified
- Treatment
- droughte2
- Compound
- monogalactolipidse2
- Outcome
- hydrolysise2
- Direction
- falle2
- Qualifier
- somewhat in parallele2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lupin”
e2“As drought intensifies, hydrolysis and monogalactolipids fall somewhat in parallel”
Claim · model-written summary
Deactivation constant changes with digalactolipids and phosphatidic acid content
- Compound
- digalactolipids and phosphatidic acid contente3
- Outcome
- deactivation constante3
- Direction
- changese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lupin”
e3“whereas the deactivation constant changes with digalactolipids and phosphatidic acid content”
Claim · model-written summary
Thylakoid F1 subunits were preserved under drought
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lupin”
e4“This alteration of the F0 lipid environment must be transduced to F1, the subunits of which, however, are preserved, as shown by LDS-PAGE”
Claim · model-written summary
ATP synthesis and hydrolysis decreased identically with stress
- Treatment
- stresse5
- Outcome
- ATP synthesis (thiol-oxidized enzyme) and hydrolysis (thiol-reduced enzyme)e5
- Direction
- identical decreasee5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lupin”
e5“ATP synthesis (thiol-oxidized enzyme) and hydrolysis (thiol-reduced enzyme) show an identical decrease with stress”
Claim · model-written summary
Stress probably impairs a common early step, the activation of the oxidized enzyme
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lupin”
e6“Thus the latter impairs a common early step, probably the activation of the oxidized enzyme”