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Oxford University Press, Plant Physiology, 2(128), p. 411-417, 2002

DOI: 10.1104/pp.010488

American Society of Plant Biologists, Plant Physiology, 2(128), p. 411-417

DOI: 10.1104/pp.128.2.411

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Inactivation of the Phloem-Specific Dof Zinc Finger Gene DAG1 Affects Response to Light and Integrity of the Testa of Arabidopsis Seeds

Journal article published in 2002 by Maura Papi, Sabrina Sabatini, Maria Maddalena Altamura, Lars Hennig ORCID, Eberhard Schafer, Paolo Costantino, Paola Vittorioso
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Abstract We show here that seeds from the knockout mutant of the Arabidopsis DAG1 gene encoding a Dof zinc finger transcription factor have an altered response to red and far-red light. Mutant dag1 seeds are induced to germinate by much lower red light fluence rates, and germination reaches more quickly a point where it is independent of phytochrome signaling. Moreover, although microscopic analysis reveals no obvious structural alterations in the seed coat (testa) of dag1 seeds, staining assays with different dyes point to an abnormal fragility of the testa. By extensive in situ mRNA hybridization analysis we show here that the gene, which is not expressed in the embryo, is specifically expressed in the phloem of all organs of the mother plant.