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Identification and overexpression of gibberellin 2‐oxidase ( GA 2ox ) in switchgrass ( P anicum virgatum L.) for improved plant architecture and reduced biomass recalcitrance

Journal Article · · Plant Biotechnology Journal
DOI:https://doi.org/10.1111/pbi.12287· OSTI ID:1401831
 [1];  [1];  [2];  [1];  [1];  [3];  [3];  [3];  [2];  [1]
  1. Department of Plant Sciences University of Tennessee Knoxville TN 37996 USA, Bioenergy Science Center Oak Ridge National Laboratory Oak Ridge TN 37831 USA
  2. Bioenergy Science Center Oak Ridge National Laboratory Oak Ridge TN 37831 USA, Plant Biology Division Samuel Roberts Noble Foundation Ardmore OK 73401 USA
  3. Bioenergy Science Center Oak Ridge National Laboratory Oak Ridge TN 37831 USA, National Renewable Energy Laboratory Golden CO 80401 USA
Summary

Gibberellin 2‐oxidases ( GA 2oxs) are a group of 2‐oxoglutarate‐dependent dioxygenases that catalyse the deactivation of bioactive GA or its precursors through 2β‐hydroxylation reaction. In this study, putatively novel switchgrass C 20 GA 2ox genes were identified with the aim of genetically engineering switchgrass for improved architecture and reduced biomass recalcitrance for biofuel. Three C 20 GA 2ox genes showed differential regulation patterns among tissues including roots, seedlings and reproductive parts. Using a transgenic approach, we showed that overexpression of two C20 GA2ox genes, that is PvGA2ox5 and PvGA2ox9 , resulted in characteristic GA‐deficient phenotypes with dark‐green leaves and modified plant architecture. The changes in plant morphology appeared to be associated with GA2ox transcript abundance. Exogenous application of GA rescued the GA ‐deficient phenotypes in transgenic lines. Transgenic semi‐dwarf lines displayed increased tillering and reduced lignin content, and the syringyl/guaiacyl lignin monomer ratio accompanied by the reduced expression of lignin biosynthetic genes compared to nontransgenic plants. A moderate increase in the level of glucose release in these transgenic lines might be attributed to reduced biomass recalcitrance as a result of reduced lignin content and lignin composition. Our results suggest that overexpression of GA 2ox genes in switchgrass is a feasible strategy to improve plant architecture and reduce biomass recalcitrance for biofuel.

Sponsoring Organization:
USDOE
OSTI ID:
1401831
Alternate ID(s):
OSTI ID: 1220794
Journal Information:
Plant Biotechnology Journal, Journal Name: Plant Biotechnology Journal Journal Issue: 5 Vol. 13; ISSN 1467-7644
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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