Moving with purpose and direction: transcription factor movement and cell fate determination revisited

Gundu, Shyam; Tabassum, Naheed; Blilou, Ikram

doi:10.1016/j.pbi.2020.08.003

Cited by 15 publications

(13 citation statements)

References 55 publications

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“…Once mature, root meristems maintain a stable size, by a balance between cell division and differentiation that allows a constant longitudinal root growth [ 26 , 27 ]. This balance is maintained by a combined action of hormone homeostasis involving auxin and cytokinin [ 26 ], which is also important for maintaining the stem cell niche through regulating a well-described gene regulatory network [ 24 , 28 ]. The stem cells reside within the root meristem, and the cells derived from them differentiate to form the different tissue types within the root.…”

Section: The Cactus Root System Is Optimized To Exploit Top-soil Watermentioning

confidence: 99%

Rooting in the Desert: A Developmental Overview on Desert Plants

Kirschner

Xiao

Blilou

2021

Genes

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Plants, as sessile organisms, have evolved a remarkable developmental plasticity to cope with their changing environment. When growing in hostile desert conditions, plants have to grow and thrive in heat and drought. This review discusses how desert plants have adapted their root system architecture (RSA) to cope with scarce water availability and poor nutrient availability in the desert soil. First, we describe how some species can survive by developing deep tap roots to access the groundwater while others produce shallow roots to exploit the short rain seasons and unpredictable rainfalls. Then, we discuss how desert plants have evolved unique developmental programs like having determinate meristems in the case of cacti while forming a branched and compact root system that allows efficient water uptake during wet periods. The remote germination mechanism in date palms is another example of developmental adaptation to survive in the dry and hot desert surface. Date palms have also designed non-gravitropic secondary roots, termed pneumatophores, to maximize water and nutrient uptake. Next, we highlight the distinct anatomical features developed by desert species in response to drought like narrow vessels, high tissue suberization, and air spaces within the root cortex tissue. Finally, we discuss the beneficial impact of the microbiome in promoting root growth in desert conditions and how these characteristics can be exploited to engineer resilient crops with a greater ability to deal with salinity induced by irrigation and with the increasing drought caused by global warming.

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Section: The Cactus Root System Is Optimized To Exploit Top-soil Watermentioning

confidence: 99%

Rooting in the Desert: A Developmental Overview on Desert Plants

Kirschner

Xiao

Blilou

2021

Genes

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“…division [59]. Generally, auxin local biosynthesis, polar transport (PINs and LAXs), reporter (TIR1/AFBs), and the downstream output of signal transduction (TMO5/7, SHR, SCR, PLT, and WOX5/7) work together to trigger the formation of ERs [65].…”

Section: Auxin and Tor Interplay Regulates The Formation Of Embryonic Rootsmentioning

confidence: 99%

“…The TMO5/LHW dimers regulate periclinal division, vascular initial cell production, vascular cell proliferation, and xylem fate determination in the embryo and RAM [ 58 ]. More importantly, TMO7 is synthesized and localized to the hypophysis and plays a role in auxin-dependent ER formation [ 57 , 59 ]. In addition, ARF5/MP promotes the expression of PINs in the pro-vascular cells of globular embryos, resulting in auxin accumulation in the basal pole of proembryos [ 60 ].…”

Section: Auxin and Tor Interplay Regulates The Formation Of Embryonic Rootsmentioning

confidence: 99%

Auxin and Target of Rapamycin Spatiotemporally Regulate Root Organogenesis

Xie

Wang

Datla

et al. 2021

IJMS

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The programs associated with embryonic roots (ERs), primary roots (PRs), lateral roots (LRs), and adventitious roots (ARs) play crucial roles in the growth and development of roots in plants. The root functions are involved in diverse processes such as water and nutrient absorption and their utilization, the storage of photosynthetic products, and stress tolerance. Hormones and signaling pathways play regulatory roles during root development. Among these, auxin is the most important hormone regulating root development. The target of rapamycin (TOR) signaling pathway has also been shown to play a key role in root developmental programs. In this article, the milestones and influential progress of studying crosstalk between auxin and TOR during the development of ERs, PRs, LRs and ARs, as well as their functional implications in root morphogenesis, development, and architecture, are systematically summarized and discussed.

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“…Several TFs provide positional information by directly moving between cells (Gallagher et al, 2014;Gundu et al, 2020). Among them, SHORTROOT (SHR) broadly impacts the specification and patterning of root tissues inside the epidermis and root cap (Benfey et al, 1993;Laurenzio et al, 1996;Helariutta et al, 2000;Sabatini et al, 2003;Carlsbecker et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Dissection of Functional Modules of AT-HOOK MOTIF NUCLEAR LOCALIZED PROTEIN 4 in the Development of the Root Xylem

Seo

Lee

2021

Front. Plant Sci.

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Xylem development in the Arabidopsis root apical meristem requires a complex cross talk between plant hormone signaling and transcriptional factors (TFs). The key processes involve fine-tuning between neighboring cells, mediated via the intercellular movement of signaling molecules. As an example, we previously reported that AT-HOOK MOTIF NUCLEAR LOCALIZED PROTEIN (AHL) 4 (AHL4), a member of the 29 AT-hook family TFs in Arabidopsis, moves into xylem precursors from their neighbors to determine xylem differentiation. As part of the effort to understand the molecular functions of AHL4, we performed domain swapping analyses using AHL1 as a counterpart, finding that AHL4 has three functionally distinctive protein modules. The plant and prokaryotes conserved (PPC) domain of AHL4 acts as a mediator of protein–protein interactions with AHL members. The N-terminus of AHL4 is required for the regulation of xylem development likely via its unique DNA-binding activity. The C-terminus of AHL4 confers intercellular mobility. Our characterization of modules in the AHL4 protein will augment our understanding of the complexity of regulation and the evolution of intercellular mobility in AHL4 and its relatives.

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Moving with purpose and direction: transcription factor movement and cell fate determination revisited

Cited by 15 publications

References 55 publications

Rooting in the Desert: A Developmental Overview on Desert Plants

Rooting in the Desert: A Developmental Overview on Desert Plants

Auxin and Target of Rapamycin Spatiotemporally Regulate Root Organogenesis

Dissection of Functional Modules of AT-HOOK MOTIF NUCLEAR LOCALIZED PROTEIN 4 in the Development of the Root Xylem

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