Abstract
Plant leaves, harvesting light energy and fixing CO2, are a major source of foods on the earth. Leaves undergo developmental and physiological shifts during their lifespan, ending with senescence and death. We characterized the key regulatory features of the leaf transcriptome during aging by analyzing total- and small-RNA transcriptomes throughout the lifespan of Arabidopsis (Arabidopsis thaliana) leaves at multidimensions, including age, RNA-type, and organelle. Intriguingly, senescing leaves showed more coordinated temporal changes in transcriptomes than growing leaves, with sophisticated regulatory networks comprising transcription factors and diverse small regulatory RNAs. The chloroplast transcriptome, but not the mitochondrial transcriptome, showed major changes during leaf aging, with a strongly shared expression pattern of nuclear transcripts encoding chloroplast-targeted proteins. Thus, unlike animal aging, leaf senescence proceeds with tight temporal and distinct interorganellar coordination of various transcriptomes that would be critical for the highly regulated degeneration and nutrient recycling contributing to plant fitness and productivity.
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Claims 4
Claim · model-written summary
Senescing leaves had more coordinated temporal transcriptome changes than growing leaves.
- Organ / stage
- senescing leavese0
- Outcome
- temporal changes in transcriptomese0
- Direction
- more coordinatede0
- Comparator
- growing leavese0
Not reportedTaxon
Verbatim
e0“senescing leaves showed more coordinated temporal changes in transcriptomes than growing leaves”
Claim · model-written summary
The chloroplast transcriptome changed substantially during leaf aging.
Not reportedTaxon
Verbatim
e0“The chloroplast transcriptome, but not the mitochondrial transcriptome, showed major changes during leaf aging”
Claim · model-written summary
The mitochondrial transcriptome did not show major changes during leaf aging.
- Outcome
- mitochondrial transcriptomee0
Not reportedTaxonDirection
Verbatim
e0“The chloroplast transcriptome, but not the mitochondrial transcriptome, showed major changes during leaf aging”
Claim · model-written summary
Nuclear transcripts encoding chloroplast-targeted proteins shared an expression pattern during leaf aging.
- Outcome
- expression pattern of nuclear transcripts encoding chloroplast-targeted proteinse0
- Direction
- strongly sharede0
Not reportedTaxon
Verbatim
e0“with a strongly shared expression pattern of nuclear transcripts encoding chloroplast-targeted proteins”