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Three ancient hormonal cues co-ordinate shoot branching in a moss

Abstract : Shoot branching is a primary contributor to plant architecture, evolving independently in flowering plant sporophytes and moss gametophytes. Mechanistic understanding of branching is largely limited to flowering plants such as Arabidopsis, which have a recent evolutionary origin. We show that in gametophytic shoots of Physcomitrella, lateral branches arise by re-specification of epidermal cells into branch initials. A simple model coordinating the activity of leafy shoot tips can account for branching patterns, and three known and ancient hormonal regulators of sporophytic branching interact to generate the branching pattern-auxin, cytokinin and strigolactone. The mode of auxin transport required in branch patterning is a key divergence point from known sporophytic pathways. Although PIN-mediated basipetal auxin transport regulates branching patterns in flowering plants, this is not so in Physcomitrella, where bi-directional transport is required to generate realistic branching patterns. Experiments with callose synthesis inhibitors suggest plasmodesmal connectivity as a potential mechanism for transport.
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https://hal.archives-ouvertes.fr/hal-02999193
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Yoan Coudert, Wojtek Palubicki, Karin Ljung, Ondrej Novak, Ottoline Leyser, et al.. Three ancient hormonal cues co-ordinate shoot branching in a moss. eLife, eLife Sciences Publication, 2015. ⟨hal-02999193⟩

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