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Luichtl M, Fiesselmann BS, Matthes M, et al. Mutations in the Arabidopsis RPK1 gene uncouple cotyledon anlagen and primordia by modulating epidermal cell shape and polarity. Biol Open. 2013;2(11):1093-102doi: 10.1242/bio.20135991.
Luichtl, M., Fiesselmann, B. S., Matthes, M., Yang, X., Peis, O., Brunner, A., & Torres-Ruiz, R. A. (2013). Mutations in the Arabidopsis RPK1 gene uncouple cotyledon anlagen and primordia by modulating epidermal cell shape and polarity. Biology open, 2(11), 1093-102. https://doi.org/10.1242/bio.20135991
Luichtl, Miriam, et al. "Mutations in the Arabidopsis RPK1 gene uncouple cotyledon anlagen and primordia by modulating epidermal cell shape and polarity." Biology open vol. 2,11 (2013): 1093-102. doi: https://doi.org/10.1242/bio.20135991
Luichtl M, Fiesselmann BS, Matthes M, Yang X, Peis O, Brunner A, Torres-Ruiz RA. Mutations in the Arabidopsis RPK1 gene uncouple cotyledon anlagen and primordia by modulating epidermal cell shape and polarity. Biol Open. 2013 Aug 22;2(11):1093-102. doi: 10.1242/bio.20135991. eCollection 2013. PMID: 24244845; PMCID: PMC3828755.
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Biol Open. 2013 Aug 22;2(11):1093-102. doi: 10.1242/bio.20135991. eCollection 2013.

Mutations in the Arabidopsis RPK1 gene uncouple cotyledon anlagen and primordia by modulating epidermal cell shape and polarity.

Biology open

Miriam Luichtl, Birgit S Fiesselmann, Michaela Matthes, Xiaomeng Yang, Ottilie Peis, Andrä Brunner, Ramon A Torres-Ruiz

Affiliations

  1. Lehrstuhl für Genetik, Technische Universität München, Wissenschaftszentrum Weihenstephan , Emil-Ramann-Strasse 8, D-85354 Freising , Germany.

PMID: 24244845 PMCID: PMC3828755 DOI: 10.1242/bio.20135991

Abstract

Plant seedlings have either one or two cotyledons. The mechanisms that regulate this organ number are poorly understood. Mutations in the RECEPTOR-LIKE PROTEIN KINASE1 (RPK1) gene of the dicot Arabidopsis have only one cotyledon, with low penetrance due to complex genetic redundancy. An analysis of patterning genes required for cotyledon initiation showed that these have normal expression patterns, defining the cotyledon anlagen, in rpk1. This was also true for key genes, which organize the shoot apical meristem (SAM). By contrast, epidermal cell shape and polarity were compromised in rpk1 embryos, as evidenced by disturbed polarity of the auxin efflux carrier PIN1. PIN1 is required for the establishment of auxin maxima, which induce and maintain organ primordia. The effects in rpk1 mutants manifest in a spatially and timely stochastic fashion probably due to redundancy of RPK1-like functions. Consistently, auxin maxima showed a stochastic distribution in rpk1 embryos, being at times entirely absent and at other times supernumerary. This variability may explain how monocotyledonous seedlings and cotyledon shape variants can developmentally arise in Arabidopsis and possibly in other plants.

Keywords: Angiosperm evolution; Arabidopsis; Cotyledon; Embryo development; RPK1

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