Coleorhiza-enforced seed dormancy : a novel mechanism to control germination in grasses. / Holloway, Thomas; Steinbrecher, Tina; Perez , Marta; Seville, Anne; Stock, David; Nakabayashi, Kazumi; Leubner-Metzger, Gerhard.

In: New Phytologist, 16.10.2020.

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@article{327c8d6a43ab46b7a139db4fe2cf3bb7,
title = "Coleorhiza-enforced seed dormancy: a novel mechanism to control germination in grasses",
abstract = "• How the biophysical properties of overlaying tissues control growth, such as the embryonic root (radicle) during seed germination, is a fundamental question. In eudicot seeds the endosperm surrounding the radicle confers coat dormancy and controls germination responses through modulation of its cell wall mechanical properties. Far less is known for grass caryopses that differ in tissue morphology. Here we report that the coleorhiza, a sheath-like organ that surrounds the radicle in grass embryos, performs the same role in the grass weed Avena fatua (common wild oat). • We combined innovative biomechanical techniques, tissue ablation, microscopy, tissue-specific gene and enzyme activity expression with the analysis of hormones and oligosaccharides.• The combined experimental work demonstrates that in grass caryopses the coleorhiza indeed controls germination for which we provide direct biomechanical evidence. We show that the coleorhiza becomes reinforced during dormancy maintenance and weakened during germination. Xyloglucan endotransglycosylases/hydrolases may have a role in coleorhiza reinforcement through cell wall remodelling to confer coat dormancy. • The control of germination by coleorhiza-enforced dormancy in grasses is an example for the convergent evolution of mechanical restraint by overlaying tissues.",
author = "Thomas Holloway and Tina Steinbrecher and Marta Perez and Anne Seville and David Stock and Kazumi Nakabayashi and Gerhard Leubner-Metzger",
note = "This is a CC BY Open Access article (CC-BY 4.0 licence)",
year = "2020",
month = oct,
day = "16",
doi = "10.1111/nph.16948",
language = "English",
journal = "New Phytologist",
issn = "0028-646X",
publisher = "Wiley-Blackwell",

}

RIS

TY - JOUR

T1 - Coleorhiza-enforced seed dormancy

T2 - a novel mechanism to control germination in grasses

AU - Holloway, Thomas

AU - Steinbrecher, Tina

AU - Perez , Marta

AU - Seville, Anne

AU - Stock, David

AU - Nakabayashi, Kazumi

AU - Leubner-Metzger, Gerhard

N1 - This is a CC BY Open Access article (CC-BY 4.0 licence)

PY - 2020/10/16

Y1 - 2020/10/16

N2 - • How the biophysical properties of overlaying tissues control growth, such as the embryonic root (radicle) during seed germination, is a fundamental question. In eudicot seeds the endosperm surrounding the radicle confers coat dormancy and controls germination responses through modulation of its cell wall mechanical properties. Far less is known for grass caryopses that differ in tissue morphology. Here we report that the coleorhiza, a sheath-like organ that surrounds the radicle in grass embryos, performs the same role in the grass weed Avena fatua (common wild oat). • We combined innovative biomechanical techniques, tissue ablation, microscopy, tissue-specific gene and enzyme activity expression with the analysis of hormones and oligosaccharides.• The combined experimental work demonstrates that in grass caryopses the coleorhiza indeed controls germination for which we provide direct biomechanical evidence. We show that the coleorhiza becomes reinforced during dormancy maintenance and weakened during germination. Xyloglucan endotransglycosylases/hydrolases may have a role in coleorhiza reinforcement through cell wall remodelling to confer coat dormancy. • The control of germination by coleorhiza-enforced dormancy in grasses is an example for the convergent evolution of mechanical restraint by overlaying tissues.

AB - • How the biophysical properties of overlaying tissues control growth, such as the embryonic root (radicle) during seed germination, is a fundamental question. In eudicot seeds the endosperm surrounding the radicle confers coat dormancy and controls germination responses through modulation of its cell wall mechanical properties. Far less is known for grass caryopses that differ in tissue morphology. Here we report that the coleorhiza, a sheath-like organ that surrounds the radicle in grass embryos, performs the same role in the grass weed Avena fatua (common wild oat). • We combined innovative biomechanical techniques, tissue ablation, microscopy, tissue-specific gene and enzyme activity expression with the analysis of hormones and oligosaccharides.• The combined experimental work demonstrates that in grass caryopses the coleorhiza indeed controls germination for which we provide direct biomechanical evidence. We show that the coleorhiza becomes reinforced during dormancy maintenance and weakened during germination. Xyloglucan endotransglycosylases/hydrolases may have a role in coleorhiza reinforcement through cell wall remodelling to confer coat dormancy. • The control of germination by coleorhiza-enforced dormancy in grasses is an example for the convergent evolution of mechanical restraint by overlaying tissues.

UR - https://nph.onlinelibrary.wiley.com/doi/10.1111/nph.16948

U2 - 10.1111/nph.16948

DO - 10.1111/nph.16948

M3 - Article

JO - New Phytologist

JF - New Phytologist

SN - 0028-646X

ER -