Topics

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

08:00 EDT 9th March 2020 | BioPortfolio

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

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 aqueous environment at cotyledon emergence but that adhesion increases as cotyledons expand. In contrast, krs mutant cotyledons show enhanced adhesion at germination. Mutants with defects in cuticle biosynthesis, but no sheath defects, show a similar adhesion profile to wild-type seedlings at germination. We propose that the sheath reduces the adhesiveness of the cotyledon surface under the humid conditions necessary for seed germination and thus promotes seed-coat shedding and rapid seedling establishment.

Affiliation

Journal Details

This article was published in the following journal.

Name: Current biology : CB
ISSN: 1879-0445
Pages: 909-915.e4

Links

DeepDyve research library

PubMed Articles [17265 Associated PubMed Articles listed on BioPortfolio]

Application of anti-adhesive barrier for recurrent acute adhesive intestinal obstruction.

Surgical treatment of a patient with recurrent acute adhesive intestinal obstruction is described. Seven plates of anti-adhesive barrier agent made from oxidized regenerated cellulose were applied to ...

An image processing method for investigating the morphology of cereal endosperm cells.

In cereal seeds, the number, morphology and development of endosperm cells are closely related to grain quality, weight and yield. Endosperm cells differ morphologically in different regions of the se...

Phytohormone dynamics in developing endosperm influence rice grain shape and quality.

Hormones are important signaling molecules regulating developmental processes and responses to environmental stimuli in higher plants. Rice endosperm, the portion of the seed surrounding the embryo, i...

Designing an anti-inflammatory and tissue-adhesive colloidal dressing for wound treatment.

Wound dressing materials are widely used to protect wounds from the external environment and to promote wound healing. However, conventional wound dressings lack tissue adhesive properties and anti-in...

Physicochemical characterization of Gleditsia triacanthos galactomannan during deposition and maturation.

Gleditsia triacanthos polysaccharide, known as galactomannan, has not been exploited as a new functional material even though it possesses industrial potential in food and biomedicine. Galactomannans ...

Clinical Trials [7259 Associated Clinical Trials listed on BioPortfolio]

PooR Embryo Yield Cleavage Stage Versus blaStocyst Embryo Transfer

The purpose of this study is to compare IVF outcomes between day 3 and day 5 embryo transfer in patients with five or fewer embryos in a fresh embryo transfer in vitro fertilization (IVF) ...

Anti-adhesive Effect and Safety of "Thermo-sensitive Adhesion Barrier (MEDICLORE)"

One of most important complication of thyroid surgery is adhesion. There are many anti-adhesive materials, but none of them showed significant outcomes. The investigators planned double bl...

Radial Artery Patency and Bleeding, Efficacy, Adverse evenT Trial

The objectives of this study are to demonstrate the safety and efficacy of the new 6Fr sheath (Glidesheath slender; Terumo, Tokyo,Japan ; GSS) compared with the contemporary 5Fr sheath (Hy...

Investigating the Adhesion of New Adhesive to the Skin

The adhesion of the new adhesive strips is investigated on healthy volunteers

Use of a Ureteral Access Sheath During Ureteroscopy and Its Effect on Stone Free Rate

Patients with upper ureteral or renal stones will be randomized to undergoing ureteroscopy with or without a ureteral access sheath. The sheath is designed to facilitate ureteroscope inser...

Medical and Biotech [MESH] Definitions

Nutritive tissue of the seeds of flowering plants that surrounds the EMBRYOS. It is produced by a parallel process of fertilization in which a second male gamete from the pollen grain fuses with two female nuclei within the embryo sac. The endosperm varies in ploidy and contains reserves of starch, oils, and proteins, making it an important source of human nutrition.

A pair of ducts near the WOLFFIAN DUCTS in a developing embryo. In the male embryo, they degenerate with the appearance of testicular ANTI-MULLERIAN HORMONE. In the absence of anti-mullerian hormone, mullerian ducts give rise to the female reproductive tract, including the OVIDUCTS; UTERUS; CERVIX; and VAGINA.

The formation of one or more genetically identical organisms derived by vegetative reproduction from a single cell. The source nuclear material can be embryo-derived, fetus-derived, or taken from an adult somatic cell.

The lipid-rich sheath surrounding AXONS in both the central and peripheral nervous systems. The myelin sheath is an electrical insulator and allows faster and more energetically efficient conduction of impulses. The sheath is formed by the cell membranes of glial cells (SCHWANN CELLS in the peripheral and OLIGODENDROGLIA in the central nervous system). Deterioration of the sheath in DEMYELINATING DISEASES is a serious clinical problem.

A part of the embryo in a seed plant. The number of cotyledons is an important feature in classifying plants. In seeds without an endosperm, they store food which is used in germination. In some plants, they emerge above the soil surface and become the first photosynthetic leaves. (From Concise Dictionary of Biology, 1990)

Quick Search


DeepDyve research library

Searches Linking to this Article