A Small Multigene Hydroxyproline-O-Galactosyltransferase Family Functions in Arabinogalactan-Protein Glycosylation, Growth, and Development in Arabidopsis

December 2015 in “ BMC plant biology ”

Debarati Basu, Lü Tian, Wuda Wang, Shauni Bobbs, Hayley Herock, Andrew Travers, Allan M. Showalter

root hair growth seed coat mucilage AGP-specific Hyp-O-GALT activity arabinogalactan-proteins GALT3 GALT4 GALT6 GALT2 GALT5 Golgi vesicles β-Gal-Yariv reagent AGP activity AGPs

Studysummary This study provides evidence that five Hyp-O-GALT genes are crucial for AGP galactosylation and that AGP glycans are vital for various aspects of plant growth and development. Our plain-language summary of this paper — not a Tressless recommendation.

The study investigated the role of a small multigene family of hydroxyproline-O-galactosyltransferases (HPGTs) in the glycosylation of arabinogalactan-proteins (AGPs) and their impact on growth and development in Arabidopsis. Researchers identified and characterized several HPGT genes, showing their involvement in adding galactose to AGPs. Mutant plants with disrupted HPGT genes exhibited altered AGP glycosylation, leading to defects in root and shoot growth, seed set, pollen tube growth, and leaf senescence. The findings highlighted the importance of HPGT-mediated glycosylation in the proper functioning of AGPs and normal plant development.

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research Two Hydroxyproline Galactosyltransferases, GALT5 and GALT2, Function in Arabinogalactan-Protein Glycosylation, Growth, and Development in Arabidopsis

63 citations , May 2015 in “PloS one”

This study found that GALT5 and GALT2 are redundant enzymes essential for O-glycosylation of AGPs, with mutations leading to significant growth and development defects in plants.

research Arabinogalactan Proteins Are Involved in Root Hair Development in Barley

32 citations , December 2014 in “Journal of experimental botany”

In this study, the authors concluded that arabinogalactan proteins recognized by specific antibodies are involved in the differentiation and development of barley root epidermal cells, contributing to root hair development.

research O-Glycosylated Cell Wall Proteins Are Essential in Root Hair Growth

274 citations , June 2011 in “Science”

In Arabidopsis thaliana, this study found that proper O-glycosylation of extensins is crucial for root hair elongation and self-assembly of the cell wall.