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Transcriptional and temporal response of Populus stems to gravi-stimulation

Journal of Integrative Plant Biology 2018年第7期60卷 578-590页

作者： Matthew Zinkgraf Suzanne Gerttula Shutang Zhao Vladimir Filkov Andrew Groover USDA Forest Service Pacific Southwest Research Station 1731 Research Park Drive Davis CA 95618 USA Department of Computer Science University of California Davis One Shields Avenue Davis CA 95618 USA State Key Laboratory of Tree Genetics and Breeding Research Institute of Forestry Chinese Academy of Forestry Beijing 100091 China Department of Plant Biology University of California Davis One Shields Avenue Davis CA 95618 USA

Plants modify development in response to external stimuli, to produce new growth that is appropriate for environmental conditions. For example, gravistimulation of leaning branches in angiosperm trees results in modifications of wood development, to produce tension wood that pulls leaning stems upright. Here, we use gravistimulation 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 withtwo types of tissue-specific impulse responses that peaked at about 24-48h, 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 Iocalization, cell wall biosynthesis and epigenetic pro- cesses. Time-series analysis of gene expression is an underutilized approach for dissecting complex develop- mental responses in plants, and can reveal gene clusters and mechanisms influencing development.

关键词： jan traas University of Lyon France

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