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Strigolactones (SLs) modulate the plastochron by regulating KLUH (KLU) transcript abundance in Arabidopsis
- Source :
- New Phytologist. 232:1909-1916
- Publication Year :
- 2021
- Publisher :
- Wiley, 2021.
-
Abstract
- The timing of leaf emergence at the shoot apical meristem, or plastochron, is highly regulated in plants. Among the genes known to regulate the plastochron in Arabidopsis (Arabidopsis thaliana), KLUH (KLU), orthologous to the rice (Oryza sativa) PLASTOCHRON1, encodes the cytochrome P450 CYP78A5, and is thought to act through generation of a still unknown mobile signal. As klu mutants display not only a short plastochron but also a branching phenotype reminiscent of strigolactone (SL) mutants, we investigated whether KLU/CYP78A5 is involved in SL biosynthesis. We combined a genetic approach, a parasitic plant seed germination bioassay to test klu root exudates, and analysis of transcript abundances of SL-biosynthesis genes in the Arabidopsis klu mutants. We demonstrate that KLU is not involved in the SL-biosynthesis pathway. Moreover, this work allowed us to uncover a new role for SL during Arabidopsis development in modulating plastochron via a KLU-dependent pathway. Globally our data reveal that KLU is required for plastochron-specific SL responses, a first indication of crosstalk between SL and the KLU-derived signal.
- Subjects :
- 0106 biological sciences
0303 health sciences
Oryza sativa
biology
Arabidopsis Proteins
Physiology
Mutant
Arabidopsis
food and beverages
Strigolactone
Plant Science
Meristem
biology.organism_classification
01 natural sciences
Cell biology
Lactones
03 medical and health sciences
Gene Expression Regulation, Plant
Arabidopsis thaliana
Plastochron
Plant hormone
Heterocyclic Compounds, 3-Ring
030304 developmental biology
010606 plant biology & botany
Subjects
Details
- ISSN :
- 14698137 and 0028646X
- Volume :
- 232
- Database :
- OpenAIRE
- Journal :
- New Phytologist
- Accession number :
- edsair.doi.dedup.....d2ab80be69581f2de121e2f81d76c6d8