Stem cells within the shoot apical meristem: identity, arrangement and communication

Uchida, Naoyuki; Torii, Keiko U.

doi:10.1007/s00018-018-2980-z

Cited by 22 publications

(6 citation statements)

References 155 publications

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“…The hornwort multicellular meristem is located at the base of the sporophyte, just above the foot connecting the sporophyte to the gametophyte, and continuously produces cells upwards that differentiate into the various cell types of the sporophyte ( Bartlett, 1928 ; Ligrone et al., 2012a ; Field et al., 2015 ). More specifically, the internal structure of the basal meristem resembles that of the root apical meristem of vascular plants ( Ligrone et al., 2012a ; Uchida and Torii, 2019 ; Dubrovsky and Vissenberg, 2021 ). Cells derived from the basal meristem are arranged in well-defined rows ( Figure 2A , circles in 3D view) that give rise to the various tissue types of the sporophyte: the columella, the sporogenous tissue, the assimilative tissue and the epidermis.…”

Section: The Unique Biology Of Hornwortsmentioning

confidence: 99%

What can hornworts teach us?

et al. 2023

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The hornworts are a small group of land plants, consisting of only 11 families and approximately 220 species. Despite their small size as a group, their phylogenetic position and unique biology are of great importance. Hornworts, together with mosses and liverworts, form the monophyletic group of bryophytes that is sister to all other land plants (Tracheophytes). It is only recently that hornworts became amenable to experimental investigation with the establishment of Anthoceros agrestis as a model system. In this perspective, we summarize the recent advances in the development of A. agrestis as an experimental system and compare it with other plant model systems. We also discuss how A. agrestis can help to further research in comparative developmental studies across land plants and to solve key questions of plant biology associated with the colonization of the terrestrial environment. Finally, we explore the significance of A. agrestis in crop improvement and synthetic biology applications in general.

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Section: The Unique Biology Of Hornwortsmentioning

confidence: 99%

What can hornworts teach us?

et al. 2023

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“…SAM maintenance is controlled by a negative feedback loop between CLAVATA 3 (CLV3) and WUSCHEL (WUS) 13 whereby WUS protein controls stem cell fate by activating CLV3 transcription, while CLV3-mediated signaling limits stem cell accumulation by restricting WUS expression 13 . The balance between stem cell loss and renewal allows plants to form new organs throughout their entire lifespan 12 , supporting the plant’s high developmental flexibility. Apart from CLV3, other factors, including chromatin remodeling actors, affect WUS expression 14 .…”

Section: Introductionmentioning

confidence: 99%

“…The SAM represents a highly organized assortment of cells required for proper and continuous above-ground growth of plants 11 . It harbors stem cells whose descendants form shoot structures like leaves, flowers and derivatives thereof (seeds and fruits) 12 . SAM maintenance is controlled by a negative feedback loop between CLAVATA 3 (CLV3) and WUSCHEL (WUS) 13 whereby WUS protein controls stem cell fate by activating CLV3 transcription, while CLV3-mediated signaling limits stem cell accumulation by restricting WUS expression 13 .…”

Section: Introductionmentioning

confidence: 99%

Transcription factor HSFA7b controls ethylene signaling and meristem maintenance at the shoot apical meristem during thermomemory

John

Apelt

Kumar

et al. 2022

Preprint

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The shoot apical meristem (SAM) is responsible for overall shoot growth by generating all above-ground structures. Recent research identified that the SAM displays an autonomous heat stress (HS) memory of a previous non-lethal HS event. Considering the importance of the SAM for plant growth it is essential to unlock how its thermomemory is mechanistically controlled. Here, we report that HEAT SHOCK TRANSCRIPTION FACTOR A7b (HSFA7b) plays a crucial role in this process in Arabidopsis. We found that HSFA7b directly regulates ethylene response at the SAM by binding to promoters of key regulators of ethylene signaling including ETHYLENE-INSENSITIVE 3 to establish thermotolerance. Moreover, HSFA7b controls maintenance of the SAM stem cell pool during thermomemory by regulating the expression of the master regulator WUSCHEL through direct transcriptional activation of the SPLAYED chromatin remodelling factor.

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“…Despite the similarities in SAM regulation between mosses and angiosperms as discussed above, some factors and modules that are critical for the maintenance of the SAM in angiosperms are absent in the mosses. WUSCHEL ( WUS ) is a master regulator for promotion of stem cell identity in the SAM in angiosperms (Uchida and Torii 2018 ). WUS is the direct target of cytokinin signaling and promotes stem cell identity (Chickarmane et al 2012 ).…”

Section: Introductionmentioning

confidence: 99%

Fundamental mechanisms of the stem cell regulation in land plants: lesson from shoot apical cells in bryophytes

Hata

Kyozuka

2021

Plant Mol Biol

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Key message This review compares the molecular mechanisms of stem cell control in the shoot apical meristems of mosses and angiosperms and reveals the conserved features and evolution of plant stem cells. Abstract The establishment and maintenance of pluripotent stem cells in the shoot apical meristem (SAM) are key developmental processes in land plants including the most basal, bryophytes. Bryophytes, such as Physcomitrium (Physcomitrella) patens and Marchantia polymorpha, are emerging as attractive model species to study the conserved features and evolutionary processes in the mechanisms controlling stem cells. Recent studies using these model bryophyte species have started to uncover the similarities and differences in stem cell regulation between bryophytes and angiosperms. In this review, we summarize findings on stem cell function and its regulation focusing on different aspects including hormonal, genetic, and epigenetic control. Stem cell regulation through auxin, cytokinin, CLAVATA3/EMBRYO SURROUNDING REGION-RELATED (CLE) signaling and chromatin modification by Polycomb Repressive Complex 2 (PRC2) and PRC1 is well conserved. Several transcription factors crucial for SAM regulation in angiosperms are not involved in the regulation of the SAM in mosses, but similarities also exist. These findings provide insights into the evolutionary trajectory of the SAM and the fundamental mechanisms involved in stem cell regulation that are conserved across land plants.

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Stem cells within the shoot apical meristem: identity, arrangement and communication

Cited by 22 publications

References 155 publications

What can hornworts teach us?

What can hornworts teach us?

Transcription factor HSFA7b controls ethylene signaling and meristem maintenance at the shoot apical meristem during thermomemory

Fundamental mechanisms of the stem cell regulation in land plants: lesson from shoot apical cells in bryophytes

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