Roles of Gibberellin Catabolism and Signaling in Growth and Physiological Response to Drought and Short-Day Photoperiods in Populus Trees

Zawaski, Christine; Busov, Victor B.

doi:10.1371/journal.pone.0086217

Roles of Gibberellin Catabolism and Signaling in Growth and Physiological Response to Drought and Short-Day Photoperiods in Populus Trees

Journal Article · Mon Jan 20 00:00:00 EST 2014 · PLoS ONE

DOI:https://doi.org/10.1371/journal.pone.0086217· OSTI ID:1904231

Zawaski, Christine ^[1]; Busov, Victor B. ^[2]

Michigan Technological Univ., Houghton, MI (United States); OSTI
Michigan Technological Univ., Houghton, MI (United States)

Survival and productivity of perennial plants in temperate zones are dependent on robust responses to prolonged and seasonal cycles of unfavorable conditions. Here we report whole-genome microarray, expression, physiological, and transgenic evidence in hybrid poplar (Populus tremula × Populus alba) showing that gibberellin (GA) catabolism and repressive signaling mediates shoot growth inhibition and physiological adaptation in response to drought and short-day (SD) induced bud dormancy. Both water deprivation and SDs elicited activation of a suite of poplar GA2ox and DELLA encoding genes. Poplar transgenics with up-regulated GA 2-oxidase (GA2ox) and DELLA domain proteins showed hypersensitive growth inhibition in response to both drought and SDs. In addition, the transgenic plants displayed greater drought resistance as evidenced by increased pigment concentrations (chlorophyll and carotenoid) and reductions in electrolyte leakage (EL). Comparative transcriptome analysis using whole-genome microarray showed that the GA-deficiency and GA-insensitivity, SD-induced dormancy, and drought response in poplar share a common regulon of 684 differentially-expressed genes, which suggest GA metabolism and signaling plays a role in plant physiological adaptations in response to alterations in environmental factors. Our results demonstrate that GA catabolism and repressive signaling represents a major route for control of growth and physiological adaptation in response to immediate or imminent adverse conditions.

View Accepted Manuscript (DOE)

Research Organization:: Oregon State University, Corvallis, OR (United States); Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States)

Sponsoring Organization:: Consortium for Plant Biotechnology Research, Inc.; USDA; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-05ER64113; FG02-06ER64185

OSTI ID:: 1904231

Journal Information:: PLoS ONE, Journal Name: PLoS ONE Journal Issue: 1 Vol. 9; ISSN 1932-6203

Publisher:: Public Library of ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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