Programming of plant leaf senescence with temporal and inter-organellar coordination of transcriptome in arabidopsis

Hye Ryun Woo, Hee Jung Koo, Jeongsik Kim, Hyobin Jeong, Jin Ok Yang, Il Hwan Lee, Ji Hyung Jun, Seung Hee Choi, Su Jin Park, Byeongsoo Kang, You Wang Kim, Bong Kwan Phee, Jin Hee Kim, Chaehwa Seo, Charny Park, Sang Cheol Kim, Seongjin Park, Byungwook Lee, Sanghyuk Lee, Daehee HwangHong Gil Nam, Pyung Ok Lim

Research output: Contribution to journalArticlepeer-review

82 Scopus citations

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.

Original languageEnglish
Pages (from-to)452-467
Number of pages16
JournalPlant Physiology
Volume171
Issue number1
DOIs
StatePublished - May 2016

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