MicroRNA156 conditions auxin sensitivity to enable growth plasticity in response to environmental changes in Arabidopsis

Qing Sang, Lusheng Fan, Tianxiang Liu, Yongjian Qiu, Juan Du, Beixin Mo, Meng Chen () and Xuemei Chen ()
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Qing Sang: Shenzhen University
Lusheng Fan: University of California
Tianxiang Liu: University of California
Yongjian Qiu: University of California
Juan Du: University of California
Beixin Mo: Shenzhen University
Meng Chen: University of California
Xuemei Chen: University of California

Nature Communications, 2023, vol. 14, issue 1, 1-14

Abstract: Abstract MicroRNAs (miRNAs) play diverse roles in plant development, but whether and how miRNAs participate in thermomorphogenesis remain ambiguous. Here we show that HYPONASTIC LEAVES 1 (HYL1)—a key component of miRNA biogenesis—acts downstream of the thermal regulator PHYTOCHROME INTERACTING FACTOR 4 in the temperature-dependent plasticity of hypocotyl growth in Arabidopsis. A hyl1-2 suppressor screen identified a dominant dicer-like1 allele that rescues hyl1-2’s defects in miRNA biogenesis and thermoresponsive hypocotyl elongation. Genome-wide miRNA and transcriptome analysis revealed microRNA156 (miR156) and its target SQUAMOSA PROMOTER-BINDING-PROTEIN-LIKE 9 (SPL9) to be critical regulators of thermomorphogenesis. Surprisingly, perturbation of the miR156/SPL9 module disengages seedling responsiveness to warm temperatures by impeding auxin sensitivity. Moreover, miR156-dependent auxin sensitivity also operates in the shade avoidance response at lower temperatures. Thus, these results unveil the miR156/SPL9 module as a previously uncharacterized genetic circuit that enables plant growth plasticity in response to environmental temperature and light changes.

Date: 2023
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DOI: 10.1038/s41467-023-36774-9

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