Abstract
Transgenic plants with genetically increased or decreased levels of cytokinins were used to investigate the effect of cytokinin level on the production of ethylene, a plant hormone with suggested role in senescence, and the production of nitric oxide, potentially important signalling and regulatory molecule. The production of these gases was followed during the course of leaf development and senescence. The production of ethylene and nitric oxide is under genetic control of genes other than those involved in regulation of senescence. The difference in basic ethylene and NO levels in different tobacco cultivars was higher than their changes in senescence. The results of this study did not indicate a direct link between ethylene production and cytokinin levels. However, there was a decreased production of NO in senescent leaves. Low cytokinins level was associated with increased NO production during leaf development. Protein nitrotyrosine proved to be a better indicator of the reactive nitrogen species than measuring of the NO production. Higher nitrotyrosine concentrations were found in insoluble proteins than in the soluble ones, pointing to membrane proteins as the primary targets of the reactive nitrogen species. In plants with elevated cytokinin levels the content of nitrated proteins decreased both in soluble and insoluble fractions. This finding indicates an antioxidative function of cytokinins against reactive nitrogen species.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Ethylene and nitric oxide production are genetically controlled separately from senescence.
- Taxon
- tobacco
Nicotiana tabacumt0 - Outcome
- production of ethylene and nitric oxidee0
- Qualifier
- genes other than those involved in regulation of senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The production of ethylene and nitric oxide is under genetic control of genes other than those involved in regulation of senescence.”
t0“tobacco”
Claim · model-written summary
Baseline gas differences among cultivars exceeded senescence changes.
- Taxon
- tobaccoNicotiana tabacume0
- Material
- different tobacco cultivarse0
- Outcome
- difference in basic ethylene and NO levelse0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The difference in basic ethylene and NO levels in different tobacco cultivars was higher than their changes in senescence.”
Claim · model-written summary
Ethylene production showed no direct link to cytokinin level.
- Taxon
- tobaccoNicotiana tabacumt0
- Compound
- cytokinine0
- Outcome
- ethylene productione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results of this study did not indicate a direct link between ethylene production and cytokinin levels.”
t0“tobacco”
Claim · model-written summary
Senescent leaves produced less nitric oxide.
- Taxon
- tobaccoNicotiana tabacumt0
- Organ / stage
- senescent leavese0
- Outcome
- production of NOe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was a decreased production of NO in senescent leaves.”
t0“tobacco”
Claim · model-written summary
Low cytokinin levels were associated with more NO during leaf development.
- Taxon
- tobaccoNicotiana tabacumt0
- Organ / stage
- leaf developmente0
- Compound
- cytokininse0
- Outcome
- NO productione0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low cytokinins level was associated with increased NO production during leaf development.”
t0“tobacco”
Claim · model-written summary
Protein nitrotyrosine was a better reactive nitrogen indicator than NO production.
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- better indicator of the reactive nitrogen speciese0
- Direction
- bettere0
- Comparator
- measuring of the NO productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Protein nitrotyrosine proved to be a better indicator of the reactive nitrogen species than measuring of the NO production.”
t0“tobacco”
Claim · model-written summary
Insoluble proteins had higher nitrotyrosine concentrations than soluble proteins.
- Taxon
- tobaccoNicotiana tabacumt0
- Organ / stage
- insoluble proteinse0
- Outcome
- nitrotyrosine concentrationse0
- Direction
- Highere0
- Comparator
- soluble onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher nitrotyrosine concentrations were found in insoluble proteins than in the soluble ones, pointing to membrane proteins as the primary targets of the reactive nitrogen species.”
t0“tobacco”
Claim · model-written summary
Elevated cytokinin reduced nitrated protein in both protein fractions.
- Taxon
- tobaccoNicotiana tabacumt0
- Organ / stage
- soluble and insoluble fractionse0
- Treatment
- elevated cytokinin levelse0
- Outcome
- content of nitrated proteinse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In plants with elevated cytokinin levels the content of nitrated proteins decreased both in soluble and insoluble fractions.”
t0“tobacco”
The same questions in other papers
class · molecular: metabolites · Nicotiana tabacum (tobacco)Positive and negative results
8 papers in the same direction as this paper · 5 in the opposite direction
- negative
- negative
- no effect
10 papers more in this group
See all 14 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.