Abstract
Cytokinin is known to be involved in many processes related to plastid development and function but the exact role of cytokinin in photosynthesis remains elusive. To investigate more profoundly the effects of cytokinin in this process, the photosynthetic activity of transgenic Pssuipt and 35S:CKX1 tobacco (Nicotiana tabacum) plants with respectively elevated and reduced endogenous cytokinin content was evaluated. Pigment analysis indicated that elevated endogenous cytokinin content resulted in increased pigment content. Functional analysis of the photosynthetic apparatus by chlorophyll a fluorescence and in vitro electron transport measurements clearly showed that changing the endogenous cytokinin content affects the activity of the photosynthetic apparatus. Surprisingly, both an increase as well as a decrease in cytokinin content results in a better photosynthetic performance. Quenching analysis revealed that the initial responses of the photosynthetic apparatus on a dark-light transition are not affected by changed cytokinin content. However, it has an effect on the further kinetic behavior. Taken together, we suggest that cytokinins can induce structural changes in the different parts of the electron transport chain as also demonstrated by the in vitro electron transport measurements.
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Claims 7
Claim · model-written summary
Altered cytokinin in Pssuipt tobacco improved pigment content.
- Taxon
- tobacco
Nicotiana tabacumt0 - Material
- Pssuipte1
- Treatment
- cytokinin contente0
- Compound
- cytokinine0
- Outcome
- pigment contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated endogenous cytokinin content resulted in increased pigment content”
t0“transgenic tobacco plants”
e1“transgenic Pssuipt and 35S:CKX1 tobacco (Nicotiana tabacum) plants with respectively elevated and reduced endogenous cytokinin content”
Claim · model-written summary
Altered cytokinin in Pssuipt tobacco improved photosynthetic performance.
- Taxon
- tobaccoNicotiana tabacumt0
- Material
- Pssuipte1
- Treatment
- cytokinin contente0
- Compound
- cytokinine0
- Outcome
- photosynthetic performancee0
- Direction
- bettere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both an increase as well as a decrease in cytokinin content results in a better photosynthetic performance”
t0“transgenic tobacco plants”
e1“transgenic Pssuipt and 35S:CKX1 tobacco (Nicotiana tabacum) plants with respectively elevated and reduced endogenous cytokinin content”
Claim · model-written summary
Altered cytokinin in 35S:CKX1 tobacco improved photosynthetic performance.
- Taxon
- tobaccoNicotiana tabacumt0
- Material
- 35S:CKX1e1
- Treatment
- cytokinin contente0
- Compound
- cytokinine0
- Outcome
- photosynthetic performancee0
- Direction
- bettere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both an increase as well as a decrease in cytokinin content results in a better photosynthetic performance”
t0“transgenic tobacco plants”
e1“transgenic Pssuipt and 35S:CKX1 tobacco (Nicotiana tabacum) plants with respectively elevated and reduced endogenous cytokinin content”
Claim · model-written summary
Changing endogenous cytokinin affected photosynthetic apparatus activity.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- endogenous cytokinin contente0
- Compound
- cytokinine0
- Outcome
- activity of the photosynthetic apparatuse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“changing the endogenous cytokinin content affects the activity of the photosynthetic apparatus.”
t0“transgenic tobacco plants”
Claim · model-written summary
Changed cytokinin content did not affect initial dark-to-light photosynthetic responses.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- changed cytokinin contente0
- Compound
- cytokinine0
- Outcome
- initial responses of the photosynthetic apparatuse0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the initial responses of the photosynthetic apparatus on a dark-light transition are not affected by changed cytokinin content.”
t0“transgenic tobacco plants”
Claim · model-written summary
Changed cytokinin content affected later photosynthetic kinetics.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- changed cytokinin contente1
- Compound
- cytokinine1
- Outcome
- further kinetic behaviore0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, it has an effect on the further kinetic behavior.”
t0“transgenic tobacco plants”
e1“changed cytokinin content”
Claim · model-written summary
Authors suggest cytokinin induces structural changes in the electron transport chain.
- Taxon
- tobaccoNicotiana tabacumt0
- Compound
- cytokininse0
- Outcome
- structural changes in the different parts of the electron transport chaine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we suggest that cytokinins can induce structural changes in the different parts of the electron transport chain”
t0“transgenic tobacco plants”
The same questions in other papers
class · physiology: pigments · Nicotiana tabacum (tobacco)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
class · physiology: photosynthesis · Nicotiana tabacum (tobacco)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
1 paper more in this group
See all 5 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.