Journal Article

Transcription Factor MtATB2: About Nodulation, Sucrose and Senescence

Katrien D’haeseleer, Annick De Keyser, Sofie Goormachtig and Marcelle Holsters

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 51, issue 9, pages 1416-1424
Published in print September 2010 | ISSN: 0032-0781
Published online July 2010 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcq104
Transcription Factor MtATB2: About Nodulation, Sucrose and Senescence

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  • Biochemistry
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The symbiotic interaction between legumes and rhizobia results in root nodules with nitrogen-fixing bacteroids. Throughout the lifespan of the nodules, the exchange of C sources and N compounds between the host plant and the bacteria is tightly balanced. Sucrose plays a major role in the provision of C skeletons and energy to the bacteroids. Transcription of MtATB2, encoding a bZIP transcription factor, is shown to be regulated by sucrose and is enhanced during nodule senescence. Transcripts occur in the nodule apex and in the vascular tissue of nodules and roots. Ectopic expression of the gene diminished nodule formation and affected root growth. Presumably, MtATB2 controls processes that are under sucrose homeostasis and are important for nodule and root growth.

Keywords: Differential expression; Medicago truncatula; Indeterminate nodule; Sucrose homeostasis; Symbiosis

Journal Article.  5249 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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