Transfer Cells: Novel Cell Types with Unique Wall Ingrowth Architecture Designed for Optimized Nutrient Transport

McCurdy, David W.

doi:10.1002/9781118647363.ch11

Cited by 5 publications

(7 citation statements)

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“…Transfer cells (TCs) play critical roles in membrane transport of solutes at various sites within plants and between plants and their environment Offler et al, 2003;McCurdy, 2015). This transport capacity is conferred by wall protuberances that extend into the cell lumen, hence called wall "ingrowths".…”

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confidence: 99%

Heteroblastic Development of Transfer Cells Is Controlled by the microRNA miR156/SPL Module

2017

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We report that wall ingrowth deposition in phloem parenchyma (PP) transfer cells (TCs) in leaf veins of Arabidopsis (Arabidopsis thaliana) represents a novel trait of heteroblasty. Development of PP TCs involves extensive deposition of wall ingrowths adjacent to cells of the sieve element/companion cell complex. These PP TCs potentially facilitate phloem loading by enhancing efflux of symplasmic Suc for subsequent active uptake into cells of the sieve element/companion cell complex. PP TCs with extensive wall ingrowths are ubiquitous in mature cotyledons and juvenile leaves, but dramatically less so in mature adult leaves, an observation consistent with PP TC development reflecting vegetative phase change (VPC) in Arabidopsis. Consistent with this conclusion, the abundance of PP TCs with extensive wall ingrowths varied across rosette development in three ecotypes displaying differing durations of juvenile phase, and extensive deposition of wall ingrowths was observed in rejuvenated leaves following prolonged defoliation. PP TC development across juvenile, transition, and adult leaves correlated positively with levels of miR156, a major regulator of VPC in plants, and corresponding changes in wall ingrowth deposition were observed when miR156 was overexpressed or its activity suppressed by target mimicry. Analysis of plants carrying miR156-resistant forms of SQUAMOSA PROMOTER BINDING PROTEIN LIKE (SPL) genes showed that wall ingrowth deposition was increased in SPL9-group but not SPL3-group genes, indicating that SPL9-group genes may function as negative regulators of wall ingrowth deposition in PP TCs. Collectively, our results point to wall ingrowth deposition in PP TCs being under control of the genetic program regulating VPC.

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confidence: 99%

Heteroblastic Development of Transfer Cells Is Controlled by the microRNA miR156/SPL Module

2017

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“…22 Since then many other surveys of the occurrence of phloem TCs have been conducted in relation to structure and function of leaf minor veins and phloem loading, [23][24][25][26] lending strong support to the observation that TCs are ubiquitous in the plant kingdom. 27,28 However, to the best of our knowledge, this is the first study reporting the distribution of phloem TCs in leaf veins in the whole individual shoot, and also the first study linking TC development to a developmental phenomenon, namely heteroblasty. Given that many species that possess phloem TCs in leaf minor veins also display heteroblastic growth, such as Pisum sativum, Senecio vulgaris, Medicago sativa, Vicia faba and Plantago lagopus, it will be of interest to investigate whether the development of TCs in these species also reflects heteroblasty, and the developmental context of this observation.…”

Section: Wall Ingrowth Deposition In Pp Tcs Is Under Control Of the Mmentioning

confidence: 94%

Wall ingrowth deposition in phloem parenchyma transfer cells in Arabidopsis: Heteroblastic variations and a potential role in pathogen defence

Nguyen

McCurdy

2017

Plant Signaling & Behavior

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Transfer cell (TCs) develop unique wall ingrowth networks which amplify plasma membrane surface area and thus maximize nutrient transporter density at key anatomic sites for nutrient exchange within plants and their external environment. These sites fall into 4 main groups corresponding to 4 categories of trans-membrane flux: absorption/secretion of solutes from or to the external environment, and absorption/secretion of solutes from or to internal, extra-cytoplasmic compartments. Research on TC biology over recent decades has demonstrated correlations between wall ingrowth deposition in TCs and enhanced transport capacity in many major agricultural species such as pea, fava bean, cotton and maize. Consequently, there is general consensus that the existence of wall ingrowth morphology implies an augmentation in membrane transport capacity. However, this may not be entirely applicable for phloem parenchyma (PP) TCs in Arabidopsis. Our recent survey of PP TC abundance and distribution in Arabidopsis veins indicated that PP TC development reflects heteroblastic status. A consequence of this observation is the suggestion that PP TCs, or at least wall ingrowth deposition in these cells, potentially act as a physical barrier to defend access of invading pathogens to sugar-rich sieve elements rather than solely in facilitating the export of photoassimilate from collection phloem in leaves.

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“…Basal endosperm transfer layer cells are epidermal cells that form an interface between the basal filial tissues and the maternal pedicel tissue ( Figure 2 ). With elaborate wall ingrowths that increase the surface area of the plasma membrane, they typify transfer cells that are important in solute movement across the apoplastic interface from the maternal tissues into the growing grain where they can be used for growth or assimilated into storage compounds ( Zheng and Wang, 2010 ; McCurdy, 2015 ). Various authors describe the inner several (2–3) cell layers with similar but distinct cytological features as an extension or inner part of the BETL ( Kiesselbach and Walker, 1952 ; Davis et al, 1990 ; Gao et al, 1998 ; Monjardino et al, 2013 ).…”

Section: Kernel and Cellular Endosperm Developmentmentioning

confidence: 99%

“…Plasmodesmata are located in the primary cell wall in between ingrowths and interconnect BETL cells but are absent between BETL cells and the underlying PC ( Davis et al, 1990 ; Monjardino et al, 2013 ). The wall ingrowths have a complex architecture with abundant parallel, rib-like projections called flange ingrowths that anastomose along their length ( Davis et al, 1990 ; Talbot et al, 2002 ; Monjardino et al, 2013 ; McCurdy, 2015 ). In the lower region of the cells, these flange wall ingrowths are interconnected by lateral extensions so wall material more or less fills the cell volume ( Davis et al, 1990 ; Talbot et al, 2002 ; Kang et al, 2009 ).…”

Section: Kernel and Cellular Endosperm Developmentmentioning

confidence: 99%

Maize Endosperm Development: Tissues, Cells, Molecular Regulation and Grain Quality Improvement

Becraft

Dannenhoffer

2022

Front. Plant Sci.

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Maize endosperm plays important roles in human diet, animal feed and industrial applications. Knowing the mechanisms that regulate maize endosperm development could facilitate the improvement of grain quality. This review provides a detailed account of maize endosperm development at the cellular and histological levels. It features the stages of early development as well as developmental patterns of the various individual tissues and cell types. It then covers molecular genetics, gene expression networks, and current understanding of key regulators as they affect the development of each tissue. The article then briefly considers key changes that have occurred in endosperm development during maize domestication. Finally, it considers prospects for how knowledge of the regulation of endosperm development could be utilized to enhance maize grain quality to improve agronomic performance, nutrition and economic value.

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Transfer Cells: Novel Cell Types with Unique Wall Ingrowth Architecture Designed for Optimized Nutrient Transport

Cited by 5 publications

References 87 publications

Heteroblastic Development of Transfer Cells Is Controlled by the microRNA miR156/SPL Module

Heteroblastic Development of Transfer Cells Is Controlled by the microRNA miR156/SPL Module

Wall ingrowth deposition in phloem parenchyma transfer cells in Arabidopsis: Heteroblastic variations and a potential role in pathogen defence

Maize Endosperm Development: Tissues, Cells, Molecular Regulation and Grain Quality Improvement

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