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Published on: May 11, 2017
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Eight hydroxyproline-O-galactosyltransferases play essential roles in female reproductive development
Diana Moreira1, Dasmeet Kaur2, Sara Fourbert-Mendes1
1LAQV Requimte, Sustainable Chemistry, Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Porto 4169-007, Portugal.
Summary
Arabidopsis reproduction depends on arabinogalactan-proteins (AGPs). A mutant lacking eight hydroxyproline-O-galactosyltransferases (Hyp-GALTs) showed unfertilized ovules and abnormal embryo sacs, highlighting AGP carbohydrate roles.
Area of Science:
- Plant Biology
- Reproductive Biology
- Biochemistry
Background:
- Seed formation in angiosperms relies on ovule development and gametophyte communication.
- Cell walls, particularly arabinogalactan-proteins (AGPs), are crucial for these reproductive interactions.
- AGP glycosylation, initiated by hydroxyproline-O-galactosyltransferases (Hyp-GALTs), is essential for AGP function.
Purpose of the Study:
- To investigate the roles of eight Hyp-GALTs (GALT2-9) in female reproductive tissues using a higher-order mutant.
- To understand the impact of under-glycosylated AGPs on ovule and embryo development.
- To identify additional Hyp-GALT enzymes in Arabidopsis.
Main Methods:
- Generation and analysis of a higher-order Hyp-GALT mutant (GALT23456789) in Arabidopsis.
- Microscopic examination of ovule and embryo sac morphology.
- Analysis of AGP distribution and abundance, including AGP-GlcA levels.
Main Results:
- The GALT23456789 mutant exhibited a high number of unfertilized ovules with abnormal callose accumulation.
- Mutant ovules displayed abnormal embryo sacs and disrupted AGP localization in female reproductive tissues.
- Seed and embryo development were impaired, with reduced AGP-GlcA levels.
Conclusions:
- At least three additional Hyp-GALTs (GALT3, 4, and 6) are involved in AGP glycosylation in Arabidopsis.
- AGP carbohydrates are critically important for the biological functions of AGPs in plant reproduction.
- Proper AGP glycosylation is essential for successful fertilization and seed development.
Keywords:
Arabinogalactan-ProteinsFemale gametophyte developmentHyp-GalactosyltransferasesPlant reproductionPollen-pistil interactionsMore Related Videos
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