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Development. 2018 Jan 9;145(1). pii: dev153858. doi: 10.1242/dev.153858.

Differential spatial distribution of miR165/6 determines variability in plant root anatomy.

Author information

1
Department of Biology and Biotechnology, Laboratory of Functional Genomics and Proteomics of Model Systems, Sapienza University of Rome, via dei Sardi, 70-00185 Rome, Italy.
2
Department of Comparative Development and Genetics, Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Köln, Germany.
3
Dipartimento Biologia e Biotecnologie and Consiglio Nazionale delle Ricerche, Istituto Biologia e Patologia Molecolari, Sapienza Università di Roma, 00185 Roma, Italy.
4
Department of Biology and Biotechnology, Laboratory of Functional Genomics and Proteomics of Model Systems, Sapienza University of Rome, via dei Sardi, 70-00185 Rome, Italy raffaele.delloioio@uniroma1.it.

Abstract

A clear example of interspecific variation is the number of root cortical layers in plants. The genetic mechanisms underlying this variability are poorly understood, partly because of the lack of a convenient model. Here, we demonstrate that Cardamine hirsuta, unlike Arabidopsis thaliana, has two cortical layers that are patterned during late embryogenesis. We show that a miR165/6-dependent distribution of the HOMEODOMAIN LEUCINE ZIPPER III (HD-ZIPIII) transcription factor PHABULOSA (PHB) controls this pattern. Our findings reveal that interspecies variation in miRNA distribution can determine differences in anatomy in plants.

KEYWORDS:

Arabidopsis; Cardamine hirsuta; Ground tissue; HD-ZIPIII; Root development; miR165/6

PMID:
29158439
DOI:
10.1242/dev.153858
[Indexed for MEDLINE]
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