![]() ![]() ![]() A moderate increase in the ambient temperature of only a few degrees can elicit dramatic adaptive responses in plant development, growth, metabolism, and immunity, which are collectively called thermomorphogenesis 2, 3. ![]() Phenotypic plasticity in response to temperature changes is critical for the survival of plants in diverse geographical environments and a constantly evolving global climate 1. 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. Moreover, miR156-dependent auxin sensitivity also operates in the shade avoidance response at lower temperatures. Surprisingly, perturbation of the miR156/ SPL9 module disengages seedling responsiveness to warm temperatures by impeding auxin sensitivity. 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. A hyl1-2 suppressor screen identified a dominant dicer-like1 allele that rescues hyl1-2’s defects in miRNA biogenesis and thermoresponsive hypocotyl elongation. 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. Microsoft Office, Visio, Project for faculty, staff, and students and server products for Stanford IT Professionals.MicroRNAs (miRNAs) play diverse roles in plant development, but whether and how miRNAs participate in thermomorphogenesis remain ambiguous. Mathematical Matrix Lab for Interactive Computation Software suite for finite element analysis and computer-aided engineeringĭata Acquisition & Control, Measurement & Programming If there is general and continuing interest in a software product not yet offered on campus, we will research the request to see if we can negotiate an agreement that will benefit the university. Software offered directly from Software LicensingĪcademic software are licensed and distributed by Software Licensing. ![]()
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