Abstract:
BACKGROUND:UDP-glucose pyrophosphorylase (UGPase) is a sugar-metabolizing enzyme (E.C. 2.7.7.9) that catalyzes a reversible reaction of UDP-glucose and pyrophosphate from glucose-1-phosphate and UTP. UDP-glucose is a key intermediate sugar that is channeled to multiple metabolic pathways. The functional role of UGPase in perennial woody plants is poorly understood. RESULTS:We characterized the functional role of a UGPase gene in Populus deltoides, PdUGPase2. Overexpression of the native gene resulted in increased leaf area and leaf-to-shoot biomass ratio but decreased shoot and root growth. Metabolomic analyses showed that manipulation of PdUGPase2 results in perturbations in primary, as well as secondary metabolism, resulting in reduced sugar and starch levels and increased phenolics, such as caffeoyl and feruloyl conjugates. While cellulose and lignin levels in the cell walls were not significantly altered, the syringyl-to-guaiacyl ratio was significantly reduced. CONCLUSIONS:These results demonstrate that PdUGPase2 plays a key role in the tightly coupled primary and secondary metabolic pathways and perturbation in its function results in pronounced effects on growth and metabolism beyond cell wall biosynthesis of Populus.
journal_name
BMC Plant Bioljournal_title
BMC plant biologyauthors
Payyavula RS,Tschaplinski TJ,Jawdy SS,Sykes RW,Tuskan GA,Kalluri UCdoi
10.1186/s12870-014-0265-8subject
Has Abstractpub_date
2014-10-07 00:00:00pages
265issn
1471-2229pii
s12870-014-0265-8journal_volume
14pub_type
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