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Differing structures of galactoglucomannan in eudicots and non-eudicot angiosperms.

Konan Ishida1, Yusuke Ohba2, Yoshihisa Yoshimi1

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Beta-galactoglucomannan (β-GGM) is a eudicot-specific cell wall component. Its unique structure and acquisition mechanism during plant evolution were investigated, revealing insights into plant cell wall diversification.

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Area of Science:

  • Plant Biology
  • Plant Cell Wall Biochemistry
  • Evolutionary Botany

Background:

  • Cell wall mannan hemicelluloses exhibit structural diversity across plant evolution.
  • Beta-galactoglucomannan (β-GGM), a novel structure with specific β-galactose branches, was recently identified in eudicots.
  • The evolutionary origin and acquisition of β-GGM remain unclear.

Purpose of the Study:

  • To investigate the evolutionary history of β-GGM and its associated enzymes.
  • To determine when and how plants acquired β-GGM.
  • To identify candidate mannan β-galactosyltransferases (MBGTs) in non-eudicot species.

Main Methods:

  • Comparative analysis of mannan structures in plant groups sister to eudicots.
  • Bioinformatic search for orthologues of key mannan-modifying enzymes (e.g., AtMBGT1) in non-eudicot angiosperms.
  • In vivo functional characterization of candidate enzymes using complementation assays in Arabidopsis and reverse genetics in rice.

Main Results:

  • Glucomannan structures in sister groups to eudicots were distinct from β-GGM.
  • Orthologues of AtMBGT1 from rice (OsGT47A-VII) and Amborella (AtrGT47A-VII) lacked direct MBGT activity.
  • The rice orthologue (OsGT47A-VII) exhibited MUR3-like xyloglucan galactosyltransferase activity and was crucial for root growth in rice.
  • Gene duplication and diversification within the GT47A-VII family in eudicots likely facilitated the acquisition of mannan β-galactosyltransferase activity.

Conclusions:

  • Beta-galactoglucomannan (β-GGM) is likely a eudicot-specific cell wall polysaccharide.
  • The evolution of the GT47A-VII gene family played a role in the acquisition of β-GGM.
  • Understanding β-GGM evolution provides insights into plant cell wall diversification and adaptation.