Temporal integration of auxin information for the regulation of patterning

Galván‐Ampudia, Carlos; Cerutti, Guillaume; Legrand, Jonathan; Brunoud, Géraldine; Martín-Arevalillo, Raquel; Azaïs, Romain; Bayle, Vincent; Moussu, Steven; Wenzl, Christian; Jaillais, Yvon; Lohmann, Jan U.; Godin, Christophe; Vernoux, Teva

doi:10.7554/elife.55832

Cited by 106 publications

(96 citation statements)

References 70 publications

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“… 49 , movie S07). More recently, Galvan-Ampudia et al ( 50 ) observed radially traveling auxin maxima in the shoot apical meristem of Arabidopsis . Our results extend their finding to the lateral displacement of maxima in gerbera heads.…”

Section: Discussionmentioning

confidence: 99%

Phyllotactic patterning of gerbera flower heads

Zhang

Cieslak

Owens

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

106

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Phyllotaxis, the distribution of organs such as leaves and flowers on their support, is a key attribute of plant architecture. The geometric regularity of phyllotaxis has attracted multidisciplinary interest for centuries, resulting in an understanding of the patterns in the model plants Arabidopsis and tomato down to the molecular level. Nevertheless, the iconic example of phyllotaxis, the arrangement of individual florets into spirals in the heads of the daisy family of plants (Asteraceae), has not been fully explained. We integrate experimental data and computational models to explain phyllotaxis in Gerbera hybrida. We show that phyllotactic patterning in gerbera is governed by changes in the size of the morphogenetically active zone coordinated with the growth of the head. The dynamics of these changes divides the patterning process into three phases: the development of an approximately circular pattern with a Fibonacci number of primordia near the head rim, its gradual transition to a zigzag pattern, and the development of a spiral pattern that fills the head on the template of this zigzag pattern. Fibonacci spiral numbers arise due to the intercalary insertion and lateral displacement of incipient primordia in the first phase. Our results demonstrate the essential role of the growth and active zone dynamics in the patterning of flower heads.

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Section: Discussionmentioning

confidence: 99%

Phyllotactic patterning of gerbera flower heads

Zhang

Cieslak

Owens

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

106

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“…This means that the embryos/seeds reach maturity in a more or less synchronized manner. This difference in the zero-to-one effects of auxin in the differentiation of megaspores, microspores and guard cells in comparison to the dose-dependent delay in embryos in the rgtb1 / rgtb1 plants may be explained by the multicellularity of the embryos [ 67 , 68 , 69 ]. In all the described structures, the increased concentration of auxin in the (sporophytic) tissues surrounding the cell/embryo seems to be inhibitory for realization of a correct developmental plan [ 70 , 71 ].…”

Section: Discussionmentioning

confidence: 99%

The Rab Geranylgeranyl Transferase Beta Subunit Is Essential for Embryo and Seed Development in Arabidopsis thaliana

Rojek

Tucker

Rychłowski

et al. 2021

IJMS

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Auxin is a key regulator of plant development affecting the formation and maturation of reproductive structures. The apoplastic route of auxin transport engages influx and efflux facilitators from the PIN, AUX and ABCB families. The polar localization of these proteins and constant recycling from the plasma membrane to endosomes is dependent on Rab-mediated vesicular traffic. Rab proteins are anchored to membranes via posttranslational addition of two geranylgeranyl moieties by the Rab Geranylgeranyl Transferase enzyme (RGT), which consists of RGTA, RGTB and REP subunits. Here, we present data showing that seed development in the rgtb1 mutant, with decreased vesicular transport capacity, is disturbed. Both pre- and post-fertilization events are affected, leading to a decrease in seed yield. Pollen tube recognition at the stigma and its guidance to the micropyle is compromised and the seed coat forms incorrectly. Excess auxin in the sporophytic tissues of the ovule in the rgtb1 plants leads to an increased tendency of autonomous endosperm formation in unfertilized ovules and influences embryo development in a maternal sporophytic manner. The results show the importance of vesicular traffic for sexual reproduction in flowering plants, and highlight RGTB1 as a key component of sporophytic-filial signaling.

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“…In this scheme, the inhibitory effect of the existing primordia on the vicinal formation of a new primordium is correspondent to the auxin depletion by drainage into the existing auxin convergence from its vicinity (Mirabet et al, 2012). On the other hand, leaf primordia and young leaves are known to be major sources of auxin in the shoot apex (Cheng et al, 2007; Galvan-Ampudia, C.S. et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

A new mathematical model of phyllotaxis to solve the genuine puzzle spiromonostichy

Yonekura

Sugiyama

2021

Preprint

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The view is widely accepted that the inhibitory effect of existing leaf primordia on new primordium formation determines phyllotactic patterning. Previous studies have shown that mathematical models based on such inhibitory effect can generate most of phyllotactic patterns. However, a few types of phyllotaxis still remain unaddressed. A notable example is costoid phyllotaxis showing spiromonostichy, which is characterized by a steep spiral with a small divergence angle and is unique to Costaceae plants. Costoid phyllotaxis has been called a "genuine puzzle" because it seems to disagree with the inhibitory effect-based mechanism. In an attempt to produce a steep spiral pattern, we developed a new mathematical model assuming that each leaf primordium emits not only the inhibitory effect but also some inductive effect. Computer simulations with the new model successfully generated a steep spiral pattern when these two effects met a certain relationship. The obtained steep spiral matched the real costoid phyllotaxis observed with Costus megalobractea. We also found by the mathematical model analysis that the early phyllotactic transition in the seedlings of this plant can be explained by the SAM enlargement.

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Temporal integration of auxin information for the regulation of patterning

Cited by 106 publications

References 70 publications

Phyllotactic patterning of gerbera flower heads

Phyllotactic patterning of gerbera flower heads

The Rab Geranylgeranyl Transferase Beta Subunit Is Essential for Embryo and Seed Development in Arabidopsis thaliana

A new mathematical model of phyllotaxis to solve the genuine puzzle spiromonostichy

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