Strigolactones Play an Important Role in Shaping Exodermal Morphology via a KAI2-Dependent Pathway
2019
Liu, Guowei | Stirnemann, Marina | Gübeli, Christian | Egloff, Susanne | Courty, Pierre-Emmanuel | Aubry, Sylvain | Vandenbussche, Michiel | Morel, Patrice | Reinhardt, Didier | Martinoia, Enrico | Borghi, Lorenzo
The majority of land plants have two suberized root barriers: the endodermis and the hypodermis (exodermis). Both barriers bear non-suberized passage cells that are thought to regulate water and nutrient exchange between the root and the soil. We learned a lot about endodermal passage cells, whereas our knowledge on hypodermal passage cells (HPCs) is still very scarce. Here we report on factors regulating theHPC number in Petunia roots. Strigolactones exhibit a positive effect, whereas supply of abscisic acid (ABA), ethylene, and auxin result in a strong reduction of the HPC number. Unexpectedly the strigolactone signaling mutant d14/dad2 showed significantly higher HPC numbers than the wild-type. In contrast, its mutant counterpart max2 of the heterodimeric receptor DAD2/MAX2 displayed a significant decrease in HPC number. A mutation in the Petunia karrikin sensor KAI2 exhibits drastically decreased HPC amounts, supporting the hypothesis that the dimeric KAI2/MAX2 receptor is central in determining the HPC number.
Show more [+] Less [-]Bibliographic information
This bibliographic record has been provided by Institut national de la recherche agronomique
