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DELAY OF GERMINATION 1 mediates a conserved coat-dormancy mechanism for the temperature- and gibberellin-dependent control of seed germination

Graeber, Kai ; Linkies, Ada ; Steinbrecher, Tina ; Mummenhoff, Klaus ; Tarkowská, Danuše ; Turečková, Veronika ; Ignatz, Michael ; Sperber, Katja ; Voegele, Antje ; de Jong, Hans ; Urbanová, Terezie ; Strnad, Miroslav ; Leubner-Metzger, Gerhard

Proceedings of the National Academy of Sciences - PNAS, 2014-08, Vol.111 (34), p.E3571-E3580 [Periódico revisado por pares]

United States: National Academy of Sciences

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Título:
DELAY OF GERMINATION 1 mediates a conserved coat-dormancy mechanism for the temperature- and gibberellin-dependent control of seed germination
Autor: Graeber, Kai ; Linkies, Ada ; Steinbrecher, Tina ; Mummenhoff, Klaus ; Tarkowská, Danuše ; Turečková, Veronika ; Ignatz, Michael ; Sperber, Katja ; Voegele, Antje ; de Jong, Hans ; Urbanová, Terezie ; Strnad, Miroslav ; Leubner-Metzger, Gerhard
Assuntos: Arabidopsis - genetics ; Arabidopsis - growth & development ; Arabidopsis - physiology ; Arabidopsis Proteins - genetics ; Biological Sciences ; Biomechanical Phenomena ; Biomechanics ; Conserved Sequence ; Diploidy ; Gene Expression Regulation, Developmental ; Gene Expression Regulation, Plant ; Genes ; Genes, Plant ; Germination ; Germination - genetics ; Germination - physiology ; Gibberellins - metabolism ; Lepidium sativum - genetics ; Lepidium sativum - growth & development ; Lepidium sativum - physiology ; Metabolism ; Molecular Sequence Data ; Mutation ; Plant Dormancy - genetics ; Plant Dormancy - physiology ; Plants, Genetically Modified ; PNAS Plus ; Seeds ; Seeds - growth & development ; Temperature
É parte de: Proceedings of the National Academy of Sciences - PNAS, 2014-08, Vol.111 (34), p.E3571-E3580
Notas: http://dx.doi.org/10.1073/pnas.1403851111
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Edited by Maarten J. Chrispeels, University of California, San Diego, La Jolla, CA, and approved July 18, 2014 (received for review March 4, 2014)
Author contributions: K.G., T.S., and G.L.-M. designed research; K.G., A.L., T.S., D.T., V.T., M.I., K.S., H.d.J., and T.U. performed research; K.G., T.S., K.M., D.T., V.T., A.V., T.U., and M.S. contributed new reagents/analytic tools; K.G., T.S., K.M., D.T., A.V., T.U., and G.L.-M. analyzed data; and K.G. and G.L.-M. wrote the paper.
Descrição: Seed germination is an important life-cycle transition because it determines subsequent plant survival and reproductive success. To detect optimal spatiotemporal conditions for germination, seeds act as sophisticated environmental sensors integrating information such as ambient temperature. Here we show that the DELAY OF GERMINATION 1 (DOG1) gene, known for providing dormancy adaptation to distinct environments, determines the optimal temperature for seed germination. By reciprocal gene-swapping experiments between Brassicaceae species we show that the DOG1-mediated dormancy mechanism is conserved. Biomechanical analyses show that this mechanism regulates the material properties of the endosperm, a seed tissue layer acting as germination barrier to control coat dormancy. We found that DOG1 inhibits the expression of gibberellin (GA)-regulated genes encoding cell-wall remodeling proteins in a temperature-dependent manner. Furthermore we demonstrate that DOG1 causes temperature-dependent alterations in the seed GA metabolism. These alterations in hormone metabolism are brought about by the temperature-dependent differential expression of genes encoding key enzymes of the GA biosynthetic pathway. These effects of DOG1 lead to a temperature-dependent control of endosperm weakening and determine the optimal temperature for germination. The conserved DOG1-mediated coat-dormancy mechanism provides a highly adaptable temperature-sensing mechanism to control the timing of germination.
Editor: United States: National Academy of Sciences
Idioma: Inglês

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DELAY OF GERMINATION 1 mediates a conserved coat-dormancy mechanism for the temperature- and gibberellin-dependent control of seed germination

Graeber, Kai ; Linkies, Ada ; Steinbrecher, Tina ; Mummenhoff, Klaus ; Tarkowská, Danuše ; Turečková, Veronika ; Ignatz, Michael ; Sperber, Katja ; Voegele, Antje ; de Jong, Hans ; Urbanová, Terezie ; Strnad, Miroslav ; Leubner-Metzger, Gerhard

United States: National Academy of Sciences

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