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Characterization of fructan biosynthesis in big bluegrass (Poa secunda)

Authors
Journal
Journal of Plant Physiology
0176-1617
Publisher
Elsevier
Publication Date
Volume
159
Issue
7
Identifiers
DOI: 10.1078/0176-1617-0781
Keywords
  • 6-Sft
  • Cdna
  • Fructan Synthesis
  • Fructosyltransferase
  • Gene Expression
  • Poa
Disciplines
  • Biology
  • Ecology
  • Geography

Abstract

Summary Most cool-season grasses contain multiple types of fructans. One exception is big bluegrass ( Poa secunda Presl.). When grown under specific controlled environmental conditions it synthesizes only β-2,6-linked fructans. This study analyzed fructan accumulations, enzyme activities and gene expression in big bluegrass. Detachment/illumination and cool treatments effectively induced the accumulation of fructans in leaf tissues. Enzyme assays indicated that 6-SST (sucrose : sucrose 6-fruc tosyltransferase)- and 6-SFT (sucrose : fructan 6-fructosyltransferase)-like activities were the major enzyme activities involved in fructan biosynthesis in big bluegrass leaves. A full-length cDNA of the putative 6-SFT gene was cloned using RT-PCR and RACE techniques. The deduced amino acid sequence showed 69 percnt; identity with barley 6-SFT. Homology was also high with other fructosyltransferases and some invertases. The abundance of putative 6-SFT mRNA showed a coincidence with fructan accumulation and 6-SFT activity. We suggest that 6-SFT is the major enzyme involved in fructan biosynthesis in big bluegrass but it may also exhibit limited 6-SST activity.

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