A common miRNA160-based mechanism regulates ovary patterning, floral organ abscission and lamina outgrowth in tomato

The Plant Journal : for Cell and Molecular Biology
Subha DamodharanTzahi Arazi

Abstract

Plant microRNAs play vital roles in auxin signaling via the negative regulation of auxin response factors (ARFs). Studies have shown that targeting of ARF10/16/17 by miR160 is indispensable for various aspects of development, but its functions in the model crop tomato (Solanum lycopersicum) are unknown. Here we knocked down miR160 (sly-miR160) using a short tandem target mimic (STTM160), and investigated its roles in tomato development. Northern blot analysis showed that miR160 is abundant in developing ovaries. In line with this, its down-regulation perturbed ovary patterning as indicated by the excessive elongation of the proximal ends of mutant ovaries and thinning of the placenta. Following fertilization, these morphological changes led to formation of elongated, pear-shaped fruits reminiscent of those of the tomato ovate mutant. In addition, STTM160-expressing plants displayed abnormal floral organ abscission, and produced leaves, sepals and petals with diminished blades, indicating a requirement for sly-miR160 for these auxin-mediated processes. We found that sly-miR160 depletion was always associated with the up-regulation of SlARF10A, SlARF10B and SlARF17, of which the expression of SlARF10A increased the most. Despite ...Continue Reading

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Citations

Jun 25, 2016·Developmental Biology·Ido ShwartzMaya Bar
Nov 20, 2016·Plant Biotechnology Journal·Chen KlapRivka Barg
Mar 28, 2017·Plant, Cell & Environment·Swati MeghaNat N V Kav
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Aug 26, 2018·The Plant Journal : for Cell and Molecular Biology·Subha DamodharanTzahi Arazi
Jul 18, 2017·The Plant Journal : for Cell and Molecular Biology·Eder Marques da SilvaFabio Tebaldi Silveira Nogueira
Nov 21, 2019·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Shuai SunXia Cui
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May 31, 2021·Molecular Genetics and Genomics : MGG·Swati Singh, Anandita Singh
Dec 10, 2021·Plant Biotechnology Journal·Panpan ZhaoTengbo Huang

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