Ragged seedling2 Encodes an ARGONAUTE7-Like Protein Required for Mediolateral Expansion, but Not Dorsiventrality, of Maize Leaves

Douglas, R. N., Wiley, D., Sarkar, A., Springer, N., Timmermans, M. C. P., Scanlon, M. J. (2010) Ragged seedling2 Encodes an ARGONAUTE7-Like Protein Required for Mediolateral Expansion, but Not Dorsiventrality, of Maize Leaves. Plant Cell, 22 (5). pp. 1441-1451. ISSN 1040-4651

URL: https://www.ncbi.nlm.nih.gov/pubmed/20453116
DOI: 10.1105/tpc.109.071613

Abstract

Leaves arise from the flank of the shoot apical meristem and are asymmetrical along the adaxial/abaxial plane from inception. Mutations perturbing dorsiventral cell fate acquisition in a variety of species can result in unifacial (radially symmetrical) leaves lacking adaxial/abaxial polarity. However, mutations in maize (Zea mays) ragged seedling2 (rgd2) condition cylindrical leaves that maintain dorsiventral polarity. Positional cloning reveals that rgd2 encodes an ARGONAUTE7 (AGO7)-like protein required to produce ta-siARF, a trans-acting small interfering RNA that targets abaxially located auxin response factor3a (arf3a) transcripts for degradation. Previous studies implicated ta-siARF in dorsiventral patterning of monocot leaves. Here, we show that arf3a transcripts hyperaccumulate but remain abaxialized in rgd2 mutant apices, revealing that ta-siARF function is not required for arf3a polarization. RGD2 also regulates miR390 accumulation and localization in maize shoot apices. Similar to the abaxialized maize mutant leafbladeless1 (lbl1), rgd2 mutants exhibit ectopic accumulation of the abaxial identity factor miR166 in adaxial domains. Thus, hyperaccumulation of arf3a and ectopic accumulation of miR166 are insufficient to condition abaxialized leaf phenotypes in maize. Finally, transcripts of a maize ago1 paralog overaccumulate in lbl1 but not in rgd2 mutants, suggesting that upregulation of ago1 combined with ectopic accumulation of miR166 contribute to abaxialized leaf formation in lbl1. We present a revised model for the role of small RNAs in dorsiventral patterning of maize leaves.

Item Type: Paper
Uncontrolled Keywords: TRANS-ACTING SIRNAS LEAF POLARITY SMALL RNAS MEDIATED REPRESSION PATTERN-FORMATION PAZ DOMAIN SHOOT APEX ARABIDOPSIS GENE MICRORNA
Subjects: organism description > plant > maize
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > argonaute proteins
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > siRNA
CSHL Authors:
Communities: CSHL labs > Timmermans lab
Depositing User: CSHL Librarian
Date Deposited: 29 Sep 2011 20:16
Last Modified: 17 Feb 2017 16:27
PMCID: PMC2899878
Related URLs:
URI: http://repository.cshl.edu/id/eprint/15402

Actions (login required)

Administrator's edit/view item Administrator's edit/view item
CSHL HomeAbout CSHLResearchEducationNews & FeaturesCampus & Public EventsCareersGiving