Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 529183
Title Transcriptional and functional targets of SCHIZORIZA in root development
Author(s) Liere, Sabine van
Source Wageningen University. Promotor(en): B.J.G. Scheres, co-promotor(en): R. Heidstra. - Wageningen : Wageningen University - ISBN 9789463437998 - 122
Department(s) Plant Developmental Biology
EPS
Publication type Dissertation, internally prepared
Publication year 2017
Availibility Full text available from 2020-11-14
Keyword(s) arabidopsis thaliana - biological development - root meristems - root caps - cell division - stem cells - transcriptomics - gene regulation - mutagenesis - arabidopsis thaliana - biologische ontwikkeling - wortelmeristemen - wortelmutsjes - celdeling - stamcellen - transcriptomica - genregulatie - mutagenese
Categories Plant Development
Abstract

In this thesis I focus on SCHIZORIZA, a gene involved in tissue specification and cell fate segregation in the Arabidopsis root. Chapter 1 describes asymmetric cell division, Arabidopdis embryo development and root meristem development. In more detail we describe the maintenance of quiescent centre and columella stem cells, the development of ground tissue and epidermis/ lateral root cap. Finally we introduce SCHIZORIZA (SCZ) as a factor involved in radial patterning and the maintenance of cortex identity.

In Chapter 2, we study the interaction between the SCZ and SHORTROOT/ SCARECROW pathways that are required in parallel during stem cell niche specification in embryogenesis for the maintenance of tissue fates. Here we investigate the strong synergy of shr and scz mutants and show that at late torpedo stage scz;shr double mutant embryos lose both ground tissue and meristem marker expression.

Chapter 3 describes the use of a transcriptomics approach to identify genes differentially regulated by SCZ. These differentially regulated genes can be divided into two distinct tissue enriched groups. Upregulated genes are enriched for root cap expression and cortex expressed genes are overrepresented in the downregulated set of genes. A subset of the upregulated genes has a HSE associated with their promoter and therefore possibly represents direct SCZ targets.

In Chapter 4 we describe a mutagenesis screen to identify functional downstream targets of SCZ. Using a cortex and lateral root cap tissue marker, we identified two suppressors of the scz mutant. Both restore the fate segregation phenotype of scz mutants. We used whole genome deep sequencing to map the causal suppressor mutations in the LBD12 gene.

The analysis of LBD12 function is described in Chapter 5. We show that the single lbd12 mutant has a QC and columella phenotype. In addition, we show that ectopic expression of LBD12 induces ectopic divisions.
Chapter 6 summarizes and discusses the work described in this thesis and gives suggestions for future research.

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