Knockout of eight hydroxyproline-O-galactosyltransferases cause multiple vegetative and reproductive growth defects

Dasmeet Kaur*, Michael A. Held, Yuan Zhang, Diana Moreira, Silvia Coimbra, Allan M. Showalter

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Arabinogalactan-proteins (AGPs) are a family of hyperglycosylated hydroxyproline-rich cell wall proteins found throughout the plant kingdom. To date, eight Hydroxyproline-galactosyltransferases (Hyp-GALTs), named GALT2-GALT9, are known to catalyze the addition of the first galactose sugar to Hyp residues in AGP protein cores. The generation and characterization of galt23456789 octuple mutants using CRISPR-Cas9 gene editing technology, provided strong reverse genetic evidence that AG glycans are essential for normal vegetative and reproductive growth, as these mutants demonstrated stunted growth, greatly delayed flowering and significant defects in floral organ development and morphogenesis. Compared to the lower seed set of galt25789 quintuple mutants being more so contributed by female gametophytic defects, dramatically low seed-set of octuple mutants was largely due to impaired male reproductive function, specifically due to shorter filaments, delayed anther dehiscence, and large decreases in pollen quantity and viability. Octuple mutant pollen had severely distorted reticulate exine, tectum patterning and intine thickness. Reduced amounts of galactose and arabinose in overall lower amounts of β-Yariv precipitated AGPs illustrated how biological functions of AGPs are affected by abnormal glycosylation.
Original languageEnglish
Article number100117
Number of pages17
JournalThe Cell Surface
Volume10
DOIs
Publication statusPublished - 15 Dec 2023
Externally publishedYes

Keywords

  • Arabinogalactan-proteins
  • Hydroxyproline-galactosyltransferases
  • Plant growth
  • Reproduction
  • Stamen defects
  • Pollen development
  • Pollen grain

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