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Tuning of SlARF10A dosage by sly-miR160a is critical for auxin-mediated compound leaf and flower development.
Plant J. 2018 11; 96(4):855-868.PJ

Abstract

miR160 adjusts auxin-mediated development by post-transcriptional regulation of the auxin response factors ARF10/16/17. In tomato, knockdown of miR160 (sly-miR160) suggested that it is required for auxin-driven leaf blade outgrowth, but whether additional developmental events are adjusted by sly-miR160 is not clear. Here, the SlMIR160 genes and the genes of its SlARFs targets were edited by CRISPR/Cas9 resulting in the isolation of loss-of-function mutants. In addition, hypomorphic mutants that accumulate variable reduced levels of sly-miR160a were isolated. We found that the loss-of-function mutants in SlMIR160a (CR-slmir160a-6/7) produced only four wiry leaves, whereas the hypomorphic mutants developed leaves and flowers with graded developmental abnormalities. Phenotypic severity correlated with the upregulation of SlARF10A. Consistent with that, double mutants in SlMIR160a and SlARF10A restored leaf and flower development indicating that over-accumulation of SlARF10A underlay the developmental abnormalities exhibited in the CR-slmir160a mutants. Phenotype severity also correlated with the upregulation of the SHOOT MERISTEMLESS homolog Tomato Knotted 2, which in turn activated the transcription of the cytokinin biosynthesis genes SlIPT2 and SlIPT4. However, no change in Tomato Knotted 2 was detected in the absence of SlARF10A, suggesting that it is upregulated due to auxin signaling suppression by SlARF10A. Knockout of sly-miR160a-targeted SlARFs showed that whereas SlARF10A is indispensable for leaf blade outgrowth and floral organ patterning, the functions of SlARF16A and SlARF17 are redundant. Taken together our results suggest that sly-miR160a promotes blade outgrowth as well as leaf and leaflet initiation and floral organ development through the quantitative regulation of its major target SlARF10A.

Authors+Show Affiliations

Plant Biology and UC Davis Genome Center, University of California, Davis, 451 Health Sciences Drive, 4409 GBSF, Davis, CA, USA.Institute of Plant Sciences, Agricultural Research Organization, Volcani Center, 68 HaMaccabim Road, P.O.B 15159, Rishon LeZion, 7505101, Israel.Institute of Plant Sciences, Agricultural Research Organization, Volcani Center, 68 HaMaccabim Road, P.O.B 15159, Rishon LeZion, 7505101, Israel.Institute of Plant Sciences, Agricultural Research Organization, Volcani Center, 68 HaMaccabim Road, P.O.B 15159, Rishon LeZion, 7505101, Israel.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

30144341

Citation

Damodharan, Subha, et al. "Tuning of SlARF10A Dosage By sly-miR160a Is Critical for Auxin-mediated Compound Leaf and Flower Development." The Plant Journal : for Cell and Molecular Biology, vol. 96, no. 4, 2018, pp. 855-868.
Damodharan S, Corem S, Gupta SK, et al. Tuning of SlARF10A dosage by sly-miR160a is critical for auxin-mediated compound leaf and flower development. Plant J. 2018;96(4):855-868.
Damodharan, S., Corem, S., Gupta, S. K., & Arazi, T. (2018). Tuning of SlARF10A dosage by sly-miR160a is critical for auxin-mediated compound leaf and flower development. The Plant Journal : for Cell and Molecular Biology, 96(4), 855-868. https://doi.org/10.1111/tpj.14073
Damodharan S, et al. Tuning of SlARF10A Dosage By sly-miR160a Is Critical for Auxin-mediated Compound Leaf and Flower Development. Plant J. 2018;96(4):855-868. PubMed PMID: 30144341.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Tuning of SlARF10A dosage by sly-miR160a is critical for auxin-mediated compound leaf and flower development. AU - Damodharan,Subha, AU - Corem,Shira, AU - Gupta,Suresh Kumar, AU - Arazi,Tzahi, Y1 - 2018/10/08/ PY - 2018/06/26/received PY - 2018/08/09/revised PY - 2018/08/15/accepted PY - 2018/8/26/pubmed PY - 2019/8/7/medline PY - 2018/8/26/entrez KW - ARF KW - Cas9 KW - auxin KW - compound leaf KW - flower KW - miR160 KW - miRNA KW - tomato SP - 855 EP - 868 JF - The Plant journal : for cell and molecular biology JO - Plant J VL - 96 IS - 4 N2 - miR160 adjusts auxin-mediated development by post-transcriptional regulation of the auxin response factors ARF10/16/17. In tomato, knockdown of miR160 (sly-miR160) suggested that it is required for auxin-driven leaf blade outgrowth, but whether additional developmental events are adjusted by sly-miR160 is not clear. Here, the SlMIR160 genes and the genes of its SlARFs targets were edited by CRISPR/Cas9 resulting in the isolation of loss-of-function mutants. In addition, hypomorphic mutants that accumulate variable reduced levels of sly-miR160a were isolated. We found that the loss-of-function mutants in SlMIR160a (CR-slmir160a-6/7) produced only four wiry leaves, whereas the hypomorphic mutants developed leaves and flowers with graded developmental abnormalities. Phenotypic severity correlated with the upregulation of SlARF10A. Consistent with that, double mutants in SlMIR160a and SlARF10A restored leaf and flower development indicating that over-accumulation of SlARF10A underlay the developmental abnormalities exhibited in the CR-slmir160a mutants. Phenotype severity also correlated with the upregulation of the SHOOT MERISTEMLESS homolog Tomato Knotted 2, which in turn activated the transcription of the cytokinin biosynthesis genes SlIPT2 and SlIPT4. However, no change in Tomato Knotted 2 was detected in the absence of SlARF10A, suggesting that it is upregulated due to auxin signaling suppression by SlARF10A. Knockout of sly-miR160a-targeted SlARFs showed that whereas SlARF10A is indispensable for leaf blade outgrowth and floral organ patterning, the functions of SlARF16A and SlARF17 are redundant. Taken together our results suggest that sly-miR160a promotes blade outgrowth as well as leaf and leaflet initiation and floral organ development through the quantitative regulation of its major target SlARF10A. SN - 1365-313X UR - https://www.unboundmedicine.com/medline/citation/30144341/Tuning_of_SlARF10A_dosage_by_sly_miR160a_is_critical_for_auxin_mediated_compound_leaf_and_flower_development_ L2 - https://doi.org/10.1111/tpj.14073 DB - PRIME DP - Unbound Medicine ER -