Local brassinosteroid biosynthesis enables optimal root growth

0546623 - ÚEB 2022 RIV GB eng J - Journal Article
Vukašinović, N. - Wang, Y. - Vanhoutte, I. - Fendrych, M. - Guo, B. - Kvasnica, Miroslav - Jiroutová, Petra - Oklešťková, Jana - Strnad, Miroslav - Russinova, E.
Local brassinosteroid biosynthesis enables optimal root growth.
Nature Plants. Roč. 7, č. 5 (2021), s. 619-632. ISSN 2055-026X. E-ISSN 2055-0278
R&D Projects: GA MŠMT(CZ) EF16_019/0000827
Institutional support: RVO:61389030
Keywords : CELL-DIVISION * GENE-EXPRESSION * ARABIDOPSIS
OECD category: Biochemistry and molecular biology
Impact factor: 17.352, year: 2021
Method of publishing: Open access
http://doi.org/10.1038/s41477-021-00917-x

Brassinosteroid (BR) hormones are indispensable for root growth and control both cell division and cell elongation through the establishment of an increasing signalling gradient along the longitudinal root axis. Because of their limited mobility, the importance of BR distribution in achieving a signalling maximum is largely overlooked. Expression pattern analysis of all known BR biosynthetic enzymes revealed that not all cells in the Arabidopsis thaliana root possess full biosynthetic machinery, and that completion of biosynthesis relies on cell-to-cell movement of hormone precursors. We demonstrate that BR biosynthesis is largely restricted to the root elongation zone, where it overlaps with BR signalling maxima. Moreover, optimal root growth requires hormone concentrations to be low in the meristem and high in the root elongation zone, attributable to increased biosynthesis. Our finding that spatiotemporal regulation of hormone synthesis results in local hormone accumulation provides a paradigm for hormone-driven organ growth in the absence of long-distance hormone transport in plants.
Permanent Link: http://hdl.handle.net/11104/0323069