Determination and Cell Interactions in Reproductive Meristems.

Huala, Eva; Sussex, Ian M.

doi:10.1105/tpc.5.10.1157

Cited by 60 publications

(18 citation statements)

References 33 publications

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“…It has long been appreciated that cell fate in developing plant tissues is determined by position rather than by lineage [37]. Thus, the orchestration of development must involve the capacity to engage in the exchange of positional information, which directs transcriptional/post-transcriptional events essential for the imprinting of cell fate.…”

Section: Role Of Macromolecular Trafficking In Plant Developmentmentioning

confidence: 99%

Plasmodesmal cell-to-cell transport of proteins and nucleic acids

1996

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The complexity associated with post-translational processing, in terms of protein sorting and delivery is now well understood. Although such studies have been focused almost exclusively on the fate of proteins within the cell in which they are synthesized, recent studies indicate that it is time to broaden this focus to incorporate the concept of intercellular targeting of proteins. Direct evidence is now available that viral and endogenous proteins can be synthesized in a particular cell and subsequently transported into neighboring (or more distant) cells. Plasmodesmata, plasma membrane-lined cytoplasmic pores, are thought to establish the intercellular pathway responsible for this cell-to-cell trafficking of macromolecules (proteins and nucleic acids). These recent findings establish a new paradigm for understanding the manner in which higher plants exert control over developmental processes. We discuss the concept that programming of plant development involves supracellular control achieved by plasmodesmal trafficking of informational molecules, herein defined as supracellular control proteins (SCPs). This novel concept may explain why, in plants, cell fate is determined by position rather than cell lineage. Finally, the circulation of long-distance SCPs, within the phloem, may provide the mechanism by which the plant signals to the shoot apical meristem that it is time to switch to the reproductive phase of its development.

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Section: Role Of Macromolecular Trafficking In Plant Developmentmentioning

confidence: 99%

Plasmodesmal cell-to-cell transport of proteins and nucleic acids

1996

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“…The conceptual nature of this picture is illustrated by the work of Huala & Sussex (1993). Drawing largely on pre‐developmental genetics work, they described cases in which meristems may be considered determined but their derivatives may not.…”

Section: Developmental Geneticsmentioning

confidence: 99%

Models of shoot apical meristem function

Tooke

Battey

2003

New Phytologist

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Contents Summary 37 Introduction 37 How things began 38 Cytology 39 Morphology 41 Developmental genetics 44 Conclusions 49 Acknowledgements 50 References 50 Summary In this review we describe how concepts of shoot apical meristem function have developed over time. The role of the scientist is emphasized, as proposer, receiver and evaluator of ideas about the shoot apical meristem. Models have become increasingly popular over the last 250 years, and we consider their role. They provide valuable grounding for the development of hypotheses, but in addition they have a strong human element and their uptake relies on various degrees of persuasion. The most influential models are probably those that most data support, consolidating them as an insight into reality; but they also work by altering how we see meristems, re‐directing us to influence the data we collect and the questions we consider meaningful.

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“…In most dicotyledonous species, shoot apical meristems consist of 3 superimposed cell layers: a superficial L1, a subsurface L2, and a deeper L3 (Sussex 1989;Huala and Sussex 1993). These layers give rise to separate cell lineages that generate the whole shoot and are distinguished by their positions and patterns of cell division.…”

Section: B Cytohistological Zonation and Chimerismmentioning

confidence: 99%

“…These layers give rise to separate cell lineages that generate the whole shoot and are distinguished by their positions and patterns of cell division. Nearly all roots, the shoots arising from them, and the central vascular tissues, such as the pith and part of the vascular tissues of stems and leaves, originate in tissue derived from L3 cells, which divide in all planes (Stewart and Derman 1970;Pratt, 1983;Huala and Sussex 1993). Subepidermal tissues such as the leaf initials, the gametes, outer part of the cortex, and sometimes part of the vascular tissues are derived from the L2 cells, which divide anticlinally within the meristem but in other planes during differentiation.…”

Section: B Cytohistological Zonation and Chimerismmentioning

confidence: 99%

“…Subepidermal tissues such as the leaf initials, the gametes, outer part of the cortex, and sometimes part of the vascular tissues are derived from the L2 cells, which divide anticlinally within the meristem but in other planes during differentiation. An important discovery was that cell differentiation to delimit the major tissues in plants is dependent on position rather than cell lineage and that cell commitment to organ identity does not occur until late in cell development (Sussex 1989;Huala and Sussex 1993). Nearly all roots, the shoots arising from them, and the central vascular tissues, such as the pith and part of the vascular tissues of stems and leaves, originate in tissue derived from L3 cells, which divide in all planes (Stewart and Derman 1970;Pratt, 1983;Huala and Sussex 1993).…”

Section: B Cytohistological Zonation and Chimerismmentioning

confidence: 99%

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