How do jasmonates control plant development?

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Published on: March 5, 2013

Jasmonates mediate responses to plant biotic- and abiotic-stress and influence plant development as well as secondary metabolism (for a recent review, see Avanci et al. 2010, GMR 9:484; Acosta and Farmer 2010, Arabidopsis Book PMC3244945. Today’s highlighted paper, at the moment in advanced view from Plant Physiology, sheds new light on the elusive mechanism behind the jasmonate inhibitory effect on plant organ development and growth, which has traditionally taken a back seat to its involvement in the stress response.

The authors used a range of traditional and systems-based methods to uncover the mechanism of growth inhibition by jasmonates (JA). First of all, they looked at the cell size and cell number in the first true leaves of Arabidopsis mutants altered in JA synthesis and perception, aos and coi1 respectively, in the presence and absence of methyl jasmonate (MeJA) treatment. Both cell size and cell number were reduced after treatment with MeJA in aos1 and the Col gl1 wildtype. This effect was minimal in coi-1, demonstrating the importance of COI1 in JA-mediated cell growth inhibition. Importantly, using flow cytometry they also showed that MeJA delays the switch from the mitotic cell cycle to the endoreduplication cycle, again in a COI1-dependent manner, as well as inhibiting mitotic cycle itself.

MeJA treated Arabidopsis seedlings. From left to right: col gl1, aos1, coi1

To work out the mechanism for JA’s effect on cell size, number, and ploidy, Noir, Bömer et al. performed novel global transcriptional profiling to identify the molecular players whose expression is regulated during leaf development by jasmonate via COI1. Senior author on the paper Alessandra Devoto from Royal Holloway, University of London explained, (more…)

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