A Maternally Deposited Endosperm Cuticle Contributes to the Physiological Defects of transparent testa Seeds

Plant Physiology
Sylvain LouberyUrszula Piskurewicz

Abstract

Mature dry seeds are highly resilient plant structures where the encapsulated embryo is kept protected and dormant to facilitate its ultimate dispersion. Seed viability is heavily dependent on the seed coat's capacity to shield living tissues from mechanical and oxidative stress. In Arabidopsis (Arabidopsis thaliana), the seed coat, also called the testa, arises after the differentiation of maternal ovular integuments during seed development. We recently described a thick cuticle tightly embedded in the mature seed's endosperm cell wall. We show here that it is produced by the maternal inner integument 1 layer and, remarkably, transferred to the developing endosperm. Arabidopsis transparent testa (tt) mutations cause maternally derived seed coat pigmentation defects. TT gene products encode proteins involved in flavonoid metabolism and regulators of seed coat development. tt mutants have abnormally high seed coat permeability, resulting in lower seed viability and dormancy. However, the biochemical basis of this high permeability is not fully understood. We show that the cuticles of developing tt mutant integuments have profound structural defects, which are associated with enhanced cuticle permeability. Genetic analysis indica...Continue Reading

Citations

Jul 12, 2019·BMC Plant Biology·Olivier CoenEnrico Magnani
Jan 23, 2020·The Biochemical Journal·Julia ZinsmeisterJulia Buitink
Jun 5, 2020·Plants·Gerardo Carrera-CastañoLuis Oñate-Sánchez
Mar 3, 2020·Frontiers in Plant Science·Olivier CoenEnrico Magnani
Jul 30, 2020·Cells·Dariusz StępińskiKatarzyna Popłońska
Sep 29, 2020·The Plant Journal : for Cell and Molecular Biology·Lara DemonsaisLuis Lopez-Molina
Oct 30, 2020·The Plant Journal : for Cell and Molecular Biology·Leonie Verhage
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Oct 28, 2021·The New Phytologist·Alice BerhinCharles Hachez

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