Abstract
Summary.The effect of prolonged ABA and JA-Me application to the growth medium of pea seedlings on PSII light reactions was assessed by monitoring of Hill reaction activity, fluorescence induction, kinetic behaviour of oxygen evolving PSII centres and polypeptide analysis of thylakoids and purified PSII oxygen evolving complexes (PSII OEC). Results show the significant inhibitory effect of the two endogenous plant growth regulators on PSII activity and some specific alterations in the structural organization of chloroplast membranes. Restoration of Hill reaction activity with DPC led to the conclusion that the used phytohormones have a direct effect on the PSII donor side and oxygen evolving enzyme complex itself. In addition, ABA and JA-Me treatment led to an increase in the number of PSII β centres situated in stroma lamellae regions, which are functioning by the cooperative mechanism for O 2 production. The polypeptide composition of grana and stroma lamellae vesicles confirmed this conclusion. Key words: abscisic acid, chlorophyll fluorescence, electron transport, jasmonic acid, thylakoids, oxygen evolution, PSII OEC Abbreviations: ABA – abscisic acid; DCPIP – 2,6 dichlorophenol-indophenol; DPC – diphenylcarbazide; JA – jasmonic acid; JA-Me – methyl jasmonate; PSII – photosystem II; PSII OEC – purified PSII oxygen evolving complexes; S-states – oxidation states of the water splitting system *Corresponding authorPSII light reactions in ABA and JA treated pea plants 49
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Claims 4
Claim · model-written summary
ABA and JA-Me application to pea seedlings significantly inhibited PSII activity.
- Taxon
- pea seedlings
Lathyrus oleraceuse0 - Treatment
- ABA and JA-Me application to the growth mediume0
- Outcome
- PSII activitye1
- Direction
- inhibitorye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of prolonged ABA and JA-Me application to the growth medium of pea seedlings on PSII light reactions was assessed”
e1“Results show the significant inhibitory effect of the two endogenous plant growth regulators on PSII activity”
Claim · model-written summary
ABA and JA-Me act directly on the PSII donor side and the oxygen evolving complex of pea.
- Taxon
- pea seedlingsLathyrus oleraceuse0
- Treatment
- used phytohormonese2
- Outcome
- direct effect on the PSII donor side and oxygen evolving enzyme complexe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pea seedlings”
e2“Restoration of Hill reaction activity with DPC led to the conclusion that the used phytohormones have a direct effect on the PSII donor side and oxygen evolving enzyme complex itself”
Claim · model-written summary
ABA and JA-Me treatment increased the number of PSII beta centres situated in stroma lamellae of pea.
- Taxon
- pea seedlingsLathyrus oleraceuse0
- Treatment
- ABA and JA-Me treatmente3
- Outcome
- number of PSII β centres situated in stroma lamellae regionse3
- Direction
- increasee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pea seedlings”
e3“ABA and JA-Me treatment led to an increase in the number of PSII β centres situated in stroma lamellae regions”
Claim · model-written summary
ABA and JA-Me treatment caused alterations in the structural organization of pea chloroplast membranes.
- Taxon
- pea seedlingsLathyrus oleraceuse0
- Treatment
- ABA and JA-Me treatmente3
- Outcome
- structural organization of chloroplast membranese4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pea seedlings”
e3“ABA and JA-Me treatment led to an increase in the number of PSII β centres situated in stroma lamellae regions”
e4“some specific alterations in the structural organization of chloroplast membranes”
The same questions in other papers
(+)-abscisic acid · physiology: photosynthesis · Lathyrus oleraceus (pea)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
jasmonic acid · physiology: photosynthesis · Lathyrus oleraceus (pea)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
in vitro · physiology: photosynthesis · Lathyrus oleraceus (pea)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- 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.