Transcriptional and temporal response of Populus stems to gravi-stimulation

Journal of Integrative Plant Biology
Matthew ZinkgrafAndrew Groover

Abstract

Plants modify development in response to external stimuli, to produce new growth that is appropriate for environmental conditions. For example, gravi-stimulation of leaning branches in angiosperm trees results in modifications of wood development, to produce tension wood that pulls leaning stems upright. Here, we use gravi-stimulation and tension wood response to dissect the temporal changes in gene expression underlying wood formation in Populus stems. Using time-series analysis of seven time points over a 14-d experiment, we identified 8,919 genes that were differentially expressed between tension wood (upper) and opposite wood (lower) sides of leaning stems. Clustering of differentially expressed genes showed four major transcriptional responses, including gene clusters whose transcript levels were associated with two types of tissue-specific impulse responses that peaked at about 24-48 h, and gene clusters with sustained changes in transcript levels that persisted until the end of the 14-d experiment. Functional enrichment analysis of those clusters suggests they reflect temporal changes in pathways associated with hormone regulation, protein localization, cell wall biosynthesis and epigenetic processes. Time-series analysi...Continue Reading

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Citations

Aug 21, 2019·BMC Plant Biology·Jin-Gui LiuLi-Jun Liu
Mar 2, 2019·Annual Review of Plant Biology·Urs FischerRishikesh P Bhalerao
Jan 27, 2019·Scientific Reports·Sunghee OhRobert W Li
May 24, 2019·The New Phytologist·Juan DuAndrew T Groover
Oct 16, 2019·Frontiers in Plant Science·Carolin SeyfferthJudith Felten
Apr 2, 2021·Plant Physiology·Baoguang LiuJack P Wang
Jun 24, 2021·The New Phytologist·Joyce G CheryCharles T Anderson

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