Article ; Online: Light-sensitive short hypocotyl genes confer symbiotic nodule identity in the legume Medicago truncatula.
2024 Volume 34, Issue 4, Page(s) 825–840.e7
Abstract: Legumes produce specialized root nodules that are distinct from lateral roots in morphology and function, with nodules intracellularly hosting nitrogen-fixing bacteria. We have previously shown that a lateral root program underpins nodule initiation, but ...
| Abstract | Legumes produce specialized root nodules that are distinct from lateral roots in morphology and function, with nodules intracellularly hosting nitrogen-fixing bacteria. We have previously shown that a lateral root program underpins nodule initiation, but there must be additional developmental regulators that confer nodule identity. Here, we show two members of the LIGHT-SENSITIVE SHORT HYPOCOTYL (LSH) transcription factor family, predominantly known to define shoot meristem complexity and organ boundaries, function as regulators of nodule organ identity. In parallel to the root initiation program, LSH1/LSH2 recruit a program into the root cortex that mediates the divergence into nodules, in particular with cell divisions in the mid-cortex. This includes regulation of auxin and cytokinin, promotion of NODULE ROOT1/2 and Nuclear Factor YA1, and suppression of the lateral root program. A principal outcome of LSH1/LSH2 function is the production of cells able to accommodate nitrogen-fixing bacteria, a key feature unique to nodules. |
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| MeSH term(s) | Medicago truncatula/genetics ; Root Nodules, Plant/genetics ; Root Nodules, Plant/microbiology ; Hypocotyl/genetics ; Hypocotyl/metabolism ; Cytokinins/genetics ; Meristem/metabolism ; Symbiosis/genetics ; Plant Proteins/genetics ; Plant Proteins/metabolism ; Gene Expression Regulation, Plant ; Plant Roots/metabolism | |||||
| Chemical Substances | Cytokinins ; Plant Proteins | |||||
| Language | English | |||||
| Publishing date | 2024-01-31 | |||||
| Publishing country | England | |||||
| Document type | Journal Article | |||||
| ZDB-ID | 1071731-6 | |||||
| ISSN | 1879-0445 ; 0960-9822 | |||||
| ISSN (online) | 1879-0445 | |||||
| ISSN | 0960-9822 | |||||
| DOI | 10.1016/j.cub.2024.01.018 | |||||
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| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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