Journal
ISCIENCE
Volume 17, Issue -, Pages 144-+Publisher
CELL PRESS
DOI: 10.1016/j.isci.2019.06.024
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Funding
- Swiss National Science Foundation [31003A-152831, 31003A-169546]
- Swiss Secretariat for Education and Research and Innovation (SERI) of the COST action STREAM [FA1206]
- Swiss National Science Foundation (SNF) [31003A_169546, 31003A_152831] Funding Source: Swiss National Science Foundation (SNF)
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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.
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