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Strigolactones repress nodule development and senescence in pea
Judith Van Dingenen1,2, Annick De Keyser1,2, Sandrien Desmet1,2,3
1Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052, Ghent, Belgium.
The Plant Journal : for Cell and Molecular Biology
|August 23, 2023
Summary
Strigolactones influence legume nodule development. Mutants showed larger, faster-maturing nodules, suggesting strigolactones regulate nodule growth, possibly via NIN and plant sugars.
Area of Science:
- Plant Biology
- Molecular Plant-Pathogen Interactions
Background:
- Strigolactones are key plant hormones regulating various developmental processes.
- Their precise role in legume nodule development remains unclear, despite known effects on nodule number.
Purpose of the Study:
- To investigate the impact of strigolactone biosynthesis and signaling mutants on nodule growth and development in Pisum sativum (pea).
Main Methods:
- Utilized Pisum sativum ramosus (rms) mutants affecting strigolactone pathways (biosynthesis: rms1, rms5; signaling: rms3, rms4).
- Analyzed nodule morphology, size, functionality (red nodules), and developmental zones.
- Assessed expression of nodulation regulator NODULE INCEPTION (NIN) and quantified sugar and malic acid levels via metabolomics.
Main Results:
- Strigolactone mutants (rms) exhibited significantly larger and more numerous functional (red) nodules compared to wild-type plants.
- Nodules in rms mutants showed accelerated development, characterized by larger nitrogen fixation/senescence zones and reduced meristematic/infection zones.
- Enhanced NIN expression was observed in rms mutant nodules, correlating with accelerated development and altered metabolic profiles (increased malic acid, reduced sugars).
Conclusions:
- Strigolactones play a crucial role in regulating legume nodule development, promoting balanced growth and maturation.
- The observed effects are likely mediated through the NIN pathway and influenced by the availability of plant sugars.
- Strigolactone signaling impacts nodule senescence and carbon allocation within the root-legume symbiosis.
Keywords:
Pisum sativum (pea)nodule developmentramosus mutantsspatial metabolomicsstrigolactonessugarsMore Related Videos
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