PIN1-Independent Leaf Initiation in Arabidopsis

Guenot, Bernadette; Bayer, Emmanuelle; Kierzkowski, Daniel; Smith, Richard Simon; Mandel, Therese; Žádníková, Petra; Benková, Eva; Kuhlemeier, Cris (2012). PIN1-Independent Leaf Initiation in Arabidopsis. Plant Physiology, 159(4), pp. 1501-1510. Rockville, Md.: American Society of Plant Physiologists 10.​1104/​pp.​112.​200402

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Phyllotaxis, the regular arrangement of leaves and flowers around the stem, is a key feature of plant architecture. Current models propose that the spatiotemporal regulation of organ initiation is controlled by a positive feedback loop between the plant hormone auxin and its efflux carrier PIN-FORMED1 (PIN1). Consequently, pin1 mutants give rise to naked inflorescence stalks with few or no flowers, indicating that PIN1 plays a crucial role in organ initiation. However, pin1 mutants do produce leaves. In order to understand the regulatory mechanisms controlling leaf initiation in Arabidopsis (Arabidopsis thaliana) rosettes, we have characterized the vegetative pin1 phenotype in detail. We show that although the timing of leaf initiation in vegetative pin1 mutants is variable and divergence angles clearly deviate from the canonical 137° value, leaves are not positioned at random during early developmental stages. Our data further indicate that other PIN proteins are unlikely to explain the persistence of leaf initiation and positioning during pin1 vegetative development. Thus, phyllotaxis appears to be more complex than suggested by current mechanistic models.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant Development

UniBE Contributor:

Guenot, Bernadette; Bayer, Emmanuelle; Kierzkowski, Daniel; Smith, Richard Simon; Mandel, Therese and Kuhlemeier, Cris

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0032-0889

Publisher:

American Society of Plant Physiologists

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

04 Oct 2013 14:41

Last Modified:

09 Oct 2015 15:20

Publisher DOI:

10.​1104/​pp.​112.​200402

PubMed ID:

22723086

Web of Science ID:

000307236700017

BORIS DOI:

10.7892/boris.16919

URI:

https://boris.unibe.ch/id/eprint/16919 (FactScience: 224625)

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