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Title: Poplar PtabZIP1-like enhances lateral root formation and biomass growth under drought stress

Journal Article · · The Plant Journal
DOI:https://doi.org/10.1111/tpj.13413· OSTI ID:1349610
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  1. Michigan Technological Univ., Houghton, MI (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Bioscience Division

Summary Developing drought‐resistance varieties is a major goal for bioenergy crops, such as poplar ( Populus ), which will be grown on marginal lands with little or no water input. Root architecture can affect drought resistance, but few genes that affect root architecture in relation to water availability have been identified. Here, using activation tagging in the prime bioenergy crop poplar, we have identified a mutant that overcomes the block of lateral root ( LR ) formation under osmotic stress. Positioning of the tag, validation of the activation and recapitulation showed that the phenotype is caused by the poplar Ptab ZIP 1‐like ( Ptab ZIP 1L ) gene with highest homology to bZIP 1 from Arabidopsis. Ptab ZIP 1L is predominantly expressed in roots, particularly in zones where lateral root primordia ( LRP ) initiate and LR differentiate and emerge. Transgenics overexpressing Ptab ZIP 1L showed precocious LRP and LR development, while Ptab ZIP 1L suppression significantly delayed both LRP and LR formation. Transgenic overexpression and suppression of Ptab ZIP 1L also resulted in modulation of key metabolites like proline, asparagine, valine and several flavonoids. Consistently, expression of both of the poplar Proline Dehydrogenase orthologs and two of the Flavonol Synthases genes was also increased and decreased in overexpressed and suppressed transgenics, respectively. These findings suggest that Ptab ZIP 1L mediates LR development and drought resistance through modulation of multiple metabolic pathways.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); US Department of Agriculture (USDA)
Grant/Contract Number:
AC05-00OR22725; SC0008462; 2009-65504-05767
OSTI ID:
1349610
Alternate ID(s):
OSTI ID: 1401028
Journal Information:
The Plant Journal, Vol. 89, Issue 4; ISSN 0960-7412
Publisher:
Society for Experimental BiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 52 works
Citation information provided by
Web of Science

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