Transcription Factor MtATB2: About Nodulation, Sucrose and Senescence

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 o...

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Bibliographic Details
Published in:Plant and cell physiology 2010-09, Vol.51 (9), p.1416-1424
Main Authors: D'haeseleer, Katrien, De Keyser, Annick, Goormachtig, Sofie, Holsters, Marcelle
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Bacteria
Base Sequence
Basic-Leucine Zipper Transcription Factors - genetics
Basic-Leucine Zipper Transcription Factors - metabolism
Cloning, Molecular
Differential expression
Gene Expression Regulation, Plant
Indeterminate nodule
Medicago truncatula
Medicago truncatula - genetics
Medicago truncatula - metabolism
Medicago truncatula - microbiology
Molecular Sequence Data
Nicotiana - genetics
Nicotiana - metabolism
Plant Proteins - genetics
Plant Proteins - metabolism
Plant Root Nodulation - genetics
Plants, Genetically Modified - genetics
Plants, Genetically Modified - metabolism
Plants, Genetically Modified - microbiology
RNA, Plant - genetics
Sequence Analysis, DNA
Sucrose - metabolism
Sucrose homeostasis
Symbiosis
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Summary: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.
ISSN:0032-0781
1471-9053
DOI:10.1093/pcp/pcq104