Cell type boundaries organize plant development

Caggiano, Monica Pia; Yu, Xiulian; Bhatia, Neha; Larsson, Anna-Maria; Ram, Hasthi; Ohno, Carolyn; Sappl, Pia G.; Meyerowitz, Elliot M.; Jönsson, Henrik; Heisler, Marcus G.

doi:10.1101/126466

Cited by 30 publications

(69 citation statements)

References 64 publications

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“…Light energy is efficiently captured by flat surfaces. Current models predict that the pre-primordial juxtaposition of adaxial (top) and abaxial (bottom) domains organizes a new axis of expansive mediolateral growth from the SAM PZ, to give rise to the flattened lamina of bifacial leaves (Waites & Hudson, 1995;Caggiano et al, 2017). In their landmark paper inspired by studies of the development of flattened wings in Drosophila melanogaster (Diaz-Benjumea & Cohen, 1993;Williams et al, 1994), Waites and Hudson examined the abaxialized, radial, adult leaves of the Antirrhinum mutant phantastica (PHAN) and extended these animal models to describe the relationship between adaxial-abaxial and mediolateral patterning in plant leaves (Waites & Hudson, 1995).…”

Section: Flat Laminar Growth: Patterning and Coordination Of Adaximentioning

confidence: 99%

“…Thus, in this model, wound-induced disruption of an adaxial-abaxial prepattern in the incipient, but as yet unelaborated, leaf primordium leads to the formation of unifacial, abaxialized leaves. No SAM-derived signal is invoked (Caggiano et al, 2017). This model remains to be tested in additional monocot and eudicot model species.…”

Section: Flat Laminar Growth: Patterning and Coordination Of Adaximentioning

confidence: 99%

“…The monophyletic monocots diverged from their eudicot relatives quite early in angiosperm evolution (Hertweck et al, 2015), although details of their evolutionary relationships are blurred by evolutionary convergences among the nearly 300 000 species within the two orders (Christenhusz & Byng, 2016). This review focuses on the comparative ontogeny of monocot and eudicot foliar leaves, which develop from the shoot apical meristem (SAM) and are dorsiventrally asymmetric from their inception (Roth, 1949;Hagemann, 1970;Caggiano et al, 2017). The two main differences defining most monocot and eudicot leaves are the patterning of the vasculature, which is typically parallel in monocots and reticulate in eudicots, and the presence of a sheathing leaf base in monocots that encircles the stem (Kaplan, 1973).…”

Section: Introductionmentioning

confidence: 99%

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On the mechanisms of development in monocot and eudicot leaves

et al. 2018

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Contents Summary I. Introduction II. Leaf zones in monocot and eudicot leaves III. Monocot and eudicot leaf initiation: differences in degree and timing, but not kind IV. Reticulate and parallel venation: extending the model? V. Flat laminar growth: patterning and coordination of adaxial-abaxial and mediolateral axes VI. Stipules and ligules: ontogeny of primordial elaborations VII. Leaf architecture VIII. Stomatal development: shared and diverged mechanisms for making epidermal pores IX. Conclusion Acknowledgements References SUMMARY: Comparisons of concepts in monocot and eudicot leaf development are presented, with attention to the morphologies and mechanisms separating these angiosperm lineages. Monocot and eudicot leaves are distinguished by the differential elaborations of upper and lower leaf zones, the formation of sheathing/nonsheathing leaf bases and vasculature patterning. We propose that monocot and eudicot leaves undergo expansion of mediolateral domains at different times in ontogeny, directly impacting features such as venation and leaf bases. Furthermore, lineage-specific mechanisms in compound leaf development are discussed. Although models for the homologies of enigmatic tissues, such as ligules and stipules, are proposed, tests of these hypotheses are rare. Likewise, comparisons of stomatal development are limited to Arabidopsis and a few grasses. Future studies may investigate correlations in the ontogenies of parallel venation and linear stomatal files in monocots, and the reticulate patterning of veins and dispersed stoma in eudicots. Although many fundamental mechanisms of leaf development are shared in eudicots and monocots, variations in the timing, degree and duration of these ontogenetic events may contribute to key differences in morphology. We anticipate that the incorporation of an ever-expanding number of sequenced genomes will enrich our understanding of the developmental mechanisms generating eudicot and monocot leaves.

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Section: Flat Laminar Growth: Patterning and Coordination Of Adaximentioning

confidence: 99%

Section: Flat Laminar Growth: Patterning and Coordination Of Adaximentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the mechanisms of development in monocot and eudicot leaves

et al. 2018

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“…Does the newly identified gene expression boundary in shoot meristems that ultimately defines the upper and lower polarity of leaves (Caggiano et al, 2017) also apply to flower meristems?…”

Section: What's Next?mentioning

confidence: 99%

Evolution and genetic control of the floral ground plan

Smyth

2018

New Phytologist

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Contents Summary70I.Introduction70II.What is the floral ground plan?71III.Diversity and evolution of the floral ground plan72IV.Genetic mechanisms77V.What's next?82Acknowledgements83References83 Summary The floral ground plan is a map of where and when floral organ primordia arise. New results combining the defined phylogeny of flowering plants with extensive character mapping have predicted that the angiosperm ancestor had whorls rather than spirals of floral organs in large numbers, and was bisexual. More confidently, the monocot ancestor likely had three organs in each whorl, whereas the rosid and asterid ancestor (Pentapetalae) had five, with the perianth now divided into sepals and petals. Genetic mechanisms underlying the establishment of the floral ground plan are being deduced using model species, the rosid Arabidopsis, the asterid Antirrhinum, and in grasses such as rice. In this review, evolutionary and genetic conclusions are drawn together, especially considering how known genes may control individual processes in the development and evolution of ground plans. These components include organ phyllotaxis, boundary formation, organ identity, merism (the number or organs per whorl), variation in the form of primordia, organ fusion, intercalary growth, floral symmetry, determinacy and, finally, cases where the distinction between flowers and inflorescences is blurred. It seems likely that new pathways of ground plan evolution, and new signalling mechanisms, will soon be uncovered by integrating morphological and genetic approaches.

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“…This R2D2 (ratiometric version of two D2s) system for rapid, sensitive and high-resolution detection of auxin sensing activities in living Arabidopsis tissues is now widely used (e.g. Caggiano et al, 2017;Di Mambro et al, 2017;Larsson et al, 2017;Liu et al, 2017;Bhatia et al, 2019;Feraru et al, 2019;Radoeva et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Minimal auxin sensing levels in vegetative moss stem cells revealed by a ratiometric reporter

2019

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Summary Efforts to reveal ancestral functions of auxin, a key regulator of plant growth and development, and its importance for evolution have been hampered by a fragmented picture of auxin response domains in early‐diverging land plants. We report the mapping of auxin sensing and responses during vegetative moss development using novel reporters. We established a moss‐specific ratiometric reporter (PpR2D2) for Auxin Response Element‐ and AUXIN RESPONSE FACTOR‐independent auxin sensing in Physcomitrella patens, and its readout during vegetative development was compared with new promoter‐based GmGH3::GFPGUS and DR5revV2::GFPGUS auxin response reporters. The ratiometric reporter responds rapidly to auxin in a time‐, dose‐ and TRANSPORT INHIBITOR RESISTANT1/AUXIN F‐BOX‐dependent manner and marks known, anticipated and novel auxin sensing domains. It reveals proximal auxin sensing maxima in filamentous tissues and sensing minima in all five vegetative gametophytic stem cell types as well as dividing cells. PpR2D2 readout is compliant with an ancestral function of auxin as a positive regulator of differentiation vs proliferation in stem cell regions. The PpR2D2 reporter is a sensitive tool for high‐resolution mapping of auxin sensing, which can increase our knowledge of auxin function in early‐diverging land plants substantially, thereby advancing our understanding of its importance for plant evolution.

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Cell type boundaries organize plant development

Cited by 30 publications

References 64 publications

On the mechanisms of development in monocot and eudicot leaves

On the mechanisms of development in monocot and eudicot leaves

Evolution and genetic control of the floral ground plan

Minimal auxin sensing levels in vegetative moss stem cells revealed by a ratiometric reporter

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