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Public Library of Science, PLoS Biology, 9(6), p. e230, 2008

DOI: 10.1371/journal.pbio.0060230

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Control of Jasmonate Biosynthesis and Senescence by miR319 Targets

Journal article published in 2008 by Carla Schommer, Javier F. Palatnik, Pooja Aggarwal, Aurore Chételat, Pilar Cubas ORCID, Edward E. Farmer, Utpal Nath, Detlef Weigel ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Considerable progress has been made in identifying the targets of plant microRNAs, many of which regulate the stability or translation of mRNAs that encode transcription factors involved in development. In most cases, it is unknown, however, which immediate transcriptional targets mediate downstream effects of the microRNA-regulated transcription factors. We identified a new process controlled by the miR319-regulated clade of TCP (TEOSINTE BRANCHED/CYCLOIDEA/PCF) transcription factor genes. In contrast to other miRNA targets, several of which modulate hormone responses, TCPs control biosynthesis of the hormone jasmonic acid. Furthermore, we demonstrate a previously unrecognized effect of TCPs on leaf senescence, a process in which jasmonic acid has been proposed to be a critical regulator. We propose that miR319-controlled TCP transcription factors coordinate two sequential processes in leaf development: leaf growth, which they negatively regulate, and leaf senescence, which they positively regulate.