The Endosperm-Derived Embryo Sheath Is an Anti-adhesive Structure that Facilitates Cotyledon Emergence during Germination in Arabidopsis.

Current Biology : CB
Nicolas M DollGwyneth Ingram

Abstract

Germination sensu stricto in Arabidopsis involves seed-coat and endosperm rupture by the emerging seedling root. Subsequently, the cotyledons emerge rapidly from the extra-embryonic tissues of the seed, allowing autotrophic seedling establishment [1, 2]. Seedling survival depends upon the presence of an intact seedling cuticle that prevents dehydration, which has hitherto been assumed to form the interface between the newly germinated seedling and its environment [3-5]. Here, we show that in Arabidopsis, this is not the case. The primary interface between the emerging seedling and its environment is formed by an extra-cuticular endosperm-derived glycoprotein-rich structure called the sheath, which is maintained as a continuous layer at seedling surfaces during germination and becomes fragmented as cotyledons expand. Mutants lacking an endosperm-specific cysteine-rich peptide (KERBEROS [KRS]) show a complete loss of sheath production [6]. Although krs mutants have no defects in germination sensu stricto, they show delayed cotyledon emergence, a defect not observed in seedlings with defects in cuticle biosynthesis. Biophysical analyses reveal that the surfaces of wild-type cotyledons show minimal adhesion to silica beads in an aq...Continue Reading

References

Mar 13, 1999·The Plant Journal : for Cell and Molecular Biology·J ToddJ G Jaworski
Aug 9, 2001·Proceedings of the National Academy of Sciences of the United States of America·K WellesenA Yephremov
May 6, 2006·Ultramicroscopy·Zachary Burton, Bharat Bhushan
Mar 31, 2007·The EMBO Journal·Michael BessireChristiane Nawrath
Nov 10, 2007·Proceedings of the National Academy of Sciences of the United States of America·Yonghua LiJohn Ohlrogge
Jan 1, 2002·The Arabidopsis Book·Matthew A JenksBertrand Lemieux
Aug 30, 2012·Nature Methods·Caroline A SchneiderKevin W Eliceiri
Oct 30, 2012·Progress in Lipid Research·Amélie Bernard, Jérôme Joubès
Jan 28, 2014·The Arabidopsis Book·Christiane NawrathLjerka Kunst
Nov 21, 2015·Journal of Experimental Botany·W E Finch-Savage, G W Bassel
Feb 13, 2016·Annual Review of Plant Biology·Eric A FichJocelyn K C Rose
Mar 31, 2016·Sub-cellular Biochemistry·Camille DeludeFrédéric Domergue
Oct 11, 2017·Journal of Experimental Botany·Gwyneth Ingram, Christiane Nawrath
Nov 25, 2017·The Plant Journal : for Cell and Molecular Biology·Robertas UrsacheNiko Geldner
Apr 24, 2018·ELife·Stéphane VergerOlivier Hamant
Jul 10, 2018·Current Opinion in Plant Biology·Anne-Charlotte Marsollier, Gwyneth Ingram

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