Epidermal expression of a sterol biosynthesis gene regulates root growth by a non-cell-autonomous mechanism in Arabidopsis .

Autor:	Short E; Department of Biosciences, Durham University, Durham DH1 3LE, UK., Leighton M; Department of Biosciences, Durham University, Durham DH1 3LE, UK., Imriz G; Department of Biosciences, Durham University, Durham DH1 3LE, UK., Liu D; Department of Biosciences, Durham University, Durham DH1 3LE, UK., Cope-Selby N; Department of Biosciences, Durham University, Durham DH1 3LE, UK., Hetherington F; Department of Biosciences, Durham University, Durham DH1 3LE, UK., Smertenko A; Department of Biosciences, Durham University, Durham DH1 3LE, UK., Hussey PJ; Department of Biosciences, Durham University, Durham DH1 3LE, UK., Topping JF; Department of Biosciences, Durham University, Durham DH1 3LE, UK., Lindsey K; Department of Biosciences, Durham University, Durham DH1 3LE, UK keith.lindsey@durham.ac.uk.
Jazyk:	angličtina
Zdroj:	Development (Cambridge, England) [Development] 2018 May 15; Vol. 145 (10). Date of Electronic Publication: 2018 May 15.
DOI:	10.1242/dev.160572
Abstrakt:	The epidermis is hypothesized to play a signalling role during plant development. One class of mutants showing defects in signal transduction and radial patterning are those in sterol biosynthesis. The expectation is that living cells require sterols, but it is not clear that all cell types express sterol biosynthesis genes. The HYDRA1 ( HYD1 ) gene of Arabidopsis encodes sterol Δ8-Δ7 isomerase, and although hyd1 seedlings are defective in radial patterning across several tissues, we show that the HYD1 gene is expressed most strongly in the root epidermis. Transgenic activation of HYD1 transcription in the epidermis of hyd1 null mutants reveals a major role in root patterning and growth. HYD1 expression in the vascular tissues and root meristem, though not endodermis or pericycle, also leads to some phenotypic rescue. Phenotypic rescue is associated with rescued patterning of the PIN1 and PIN2 auxin efflux carriers. The importance of the epidermis in controlling root growth and development is proposed to be, in part, due to its role as a site for sterol biosynthesis, and auxin is a candidate for the non-cell-autonomous signal. Competing Interests: Competing interestsThe authors declare no competing or financial interests. (© 2018. Published by The Company of Biologists Ltd.)
Databáze:	MEDLINE
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