Genetic Control of Anther Cell Division and Differentiation

Hord, Carey L.H.; Mā, Hong

doi:10.1007/7089_2007_136

Cited by 6 publications

(7 citation statements)

References 44 publications

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“…Collectively, microscopic reconstructions and experimental manipulations of redox refute the prevailing lineage model of anther development that asserts that a monoclonal germinal lineage is founded by a singular asymmetric cell division in each lobe (3, 4). We propose that early anther lobes in maize are composed of equivalent, multipotent L2-d cells expressing MAC1, MSCA1, and its archesporial fate–determining target(s).…”

mentioning

confidence: 91%

“…Most animals sequester germline stem cells during embryogenesis (1, 2), whereas plants are strictly vegetative until intrinsic and environmental cues trigger reproduction (3, 4). The morphogenetic mechanism underlying the somatic-to-germinal switch is a botanical mystery, which if understood would permit tailored manipulations in crop breeding and yield enhancement.…”

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confidence: 99%

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Hypoxia Triggers Meiotic Fate Acquisition in Maize

Kelliher

Walbot

2012

Science

188

199

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Evidence from confocal microscopic reconstruction of maize anther development in fertile, mac1 (excess germ cells), and msca1 (no germ cells) flowers indicates that the male germ line is multiclonal and uses the MAC1 protein to organize the somatic niche. Furthermore, we identified redox status as a determinant of germ cell fate, defining a mechanism distinct from the animal germ cell lineage. Decreasing oxygen or H2O2 increases germ cell numbers, stimulates superficial germ cell formation, and rescues germinal differentiation in msca1 flowers. Conversely, oxidizing environments inhibit germ cell specification and cause ectopic differentiation in deeper tissues. We propose that hypoxia, arising naturally within growing anther tissue, acts as a positional cue to set germ cell fate.

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mentioning

confidence: 91%

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confidence: 99%

Hypoxia Triggers Meiotic Fate Acquisition in Maize

Kelliher

Walbot

2012

Science

188

199

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“…Within each lobe, cells divide and differentiate to form distinct somatic cell layers surrounding the developing reproductive cells, or the pollen mother cells (PMCs). The proper formation and development of these somatic cell layers is critical for the development and eventual release of pollen grains (Mariani et al, 1990(Mariani et al, , 1991Denis et al, 1993;Ross et al, 1996;Sanders et al, 1999;Zhao et al, 2002;Ma, 2005;Hord and Ma, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…To date, only a few genes are known to be involved in early anther cell division and cell differentiation events, including SPOROCYTELESS/NOZZLE (SPL/NZZ), EXCESS MICROSPO-ROCYTES1/EXTRA SPOROGENOUS CELLS (EMS1/EXS), SOMATIC EMBRYOGENESIS1 (SERK1), SERK2, and TAPETUM DETERMINANT1 (TPD1) (Schiefthaler et al, 1999;Yang et al, 1999;Canales et al, 2002;Zhao et al, 2002;Yang et al, 2003Yang et al, , 2005Ito et al, 2004;Albrecht et al, 2005;Colcombet et al, 2005;Ma, 2005;Hord and Ma, 2006). SPL/NZZ was shown to promote microsporogenesis under the control of AGAMOUS in whorl three floral organs (Ito et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…The mutant anther lobes completely lack the nutritive tapetum layer. Although the excess PMCs enter meiosis and undergo nuclear division, they fail to complete cytokinesis and degrade completely by anther stage 7 (Ma, 2005;Hord and Ma, 2006). EMS1/ EXS, SERK1, and SERK2 encode LRR-RLKs, indicating an essential role for a position-dependent intercellular signaling event (Canales et al, 2002;Zhao et al, 2002;Albrecht et al, 2005;Colcombet et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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The BAM1/BAM2 Receptor-Like Kinases Are Important Regulators ofArabidopsisEarly Anther Development

et al. 2006

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Anther development involves the formation of several adjacent cell types required for normal male fertility. Only a few genes are known to be involved in early anther development, particularly in the establishment of these different cell layers. Arabidopsis thaliana BAM1 (for BARELY ANY MERISTEM) and BAM2 encode CLAVATA1-related Leu-rich repeat receptorlike kinases that appear to have redundant or overlapping functions. We characterized anther development in the bam1 bam2 flowers and found that bam1 bam2 anthers appear to be abnormal at a very early stage and lack the endothecium, middle, and tapetum layers. Analyses using molecular markers and cytological techniques of bam1 bam2 anthers revealed that cells interior to the epidermis acquire some characteristics of pollen mother cells (PMCs), suggesting defects in cell fate specification. The pollen mother-like cells degenerate before the completion of meiosis, suggesting that these cells are defective. In addition, the BAM1 and BAM2 expression pattern supports both an early role in promoting somatic cell fates and a subsequent function in the PMCs. Therefore, analysis of BAM1 and BAM2 revealed a cell-cell communication process important for early anther development, including aspects of cell division and differentiation. This finding may have implications for the evolution of multiple signaling pathways in specifying cell types for microsporogenesis.

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Time-resolved transcriptome of barley anthers and meiocytes reveals robust and largely stable gene expression changes at meiosis entry

Barakate

Orr

Schreiber

et al. 2020

Preprint

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In flowering plants, successful germinal cell development and meiotic recombination depend upon a combination of environmental and genetic factors. To gain insights into this specialised reproductive development programme we used short- and long-read RNA-sequencing (RNA-seq) to study the temporal dynamics of transcript abundance in immuno-cytologically staged barley (Hordeum vulgare) anthers and meiocytes. We show that the most significant transcriptional changes occur at the transition from pre-meiosis to leptotene–zygotene, which is followed by largely stable transcript abundance throughout prophase I. Our analysis reveals that the developing anthers and meiocytes are enriched in long non-coding RNAs (lncRNAs) and that entry to meiosis is characterized by their robust and significant down regulation. Intriguingly, only 24% of a collection of putative meiotic gene orthologues showed differential transcript abundance in at least one stage or tissue comparison. Changes in the abundance of numerous transcription factors, representatives of the small RNA processing machinery, and post-translational modification pathways highlight the complexity of the regulatory networks involved. These developmental, time-resolved, and dynamic transcriptomes increase our understanding of anther and meiocyte development and will help guide future research.One sentence summaryAnalysis of RNA-seq data from meiotically staged barley anthers and meiocytes highlights the role of lncRNAs within a complex network of transcriptional and post-transcriptional regulation accompanied by a hiatus in differential gene expression during prophase I.The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantcell.org) is: Robbie Waugh (robbie.waugh@hutton.ac.uk)

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Genetic Control of Anther Cell Division and Differentiation

Cited by 6 publications

References 44 publications

Hypoxia Triggers Meiotic Fate Acquisition in Maize

Hypoxia Triggers Meiotic Fate Acquisition in Maize

The BAM1/BAM2 Receptor-Like Kinases Are Important Regulators ofArabidopsisEarly Anther Development

Time-resolved transcriptome of barley anthers and meiocytes reveals robust and largely stable gene expression changes at meiosis entry

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