Control of cambium initiation and activity in Arabidopsis by the transcriptional regulator AHL15

0561529 - ÚEB 2023 RIV GB eng J - Journal Article
Rahimi, A. - Karami, O. - Lestari, A. D. - de Werk, T. - Amakorová, Petra - Shi, D. - Novák, Ondřej - Greb, T. - Offringa, R.
Control of cambium initiation and activity in Arabidopsis by the transcriptional regulator AHL15.
Current Biology. Roč. 32, č. 8 (2022), s. 1764-1775. ISSN 0960-9822. E-ISSN 1879-0445
R&D Projects: GA MŠMT(CZ) EF16_019/0000827
Institutional support: RVO:61389030
Keywords : ahl15 * Arabidopsis * cytokinin * ful * secondary growth * secondary xylem * soc1 * tdif-pxy-wox * vascular cambium * woody
OECD category: Biochemistry and molecular biology
Impact factor: 9.2, year: 2022
Method of publishing: Open access
https://doi.org/10.1016/j.cub.2022.02.060

Plant secondary growth, which is the basis of wood formation, includes the production of secondary xylem, which is derived from meristematic cambium cells embedded in vascular tissue. Here, we identified an important role for the Arabidopsis thaliana (Arabidopsis) AT-HOOK MOTIF CONTAINING NUCLEAR LOCALIZED 15 (AHL15) transcriptional regulator in controlling vascular cambium activity. The limited secondary xylem development in inflorescence stems of herbaceous Arabidopsis plants was significantly reduced in ahl15 loss-of-function mutants, whereas constitutive or vascular meristem-specific AHL15 overexpression produced woody inflorescence stems. AHL15 was required for enhanced secondary xylem formation in the woody suppressor of overexpression of constans 1 (soc1) fruitfull (ful) double loss-of-function mutant. Moreover, we found that AHL15 induces vascular cambium activity downstream of the repressing SOC1 and FUL transcription factors, most likely similar to how it enhances lateral branching by promoting biosynthesis of the hormone cytokinin. Our results uncover a novel pathway driving cambium development, in which AHL15 expression levels act in parallel to and are dependent on the well-established TDIF-PXY-WOX pathway to differentiate between herbaceous and woody stem growth.
Permanent Link: https://hdl.handle.net/11104/0334116