scholarly journals Interaction between Wall Deposition and Cell Elongation in Dark-Grown Hypocotyl Cells in Arabidopsis

2004 ◽  
Vol 135 (2) ◽  
pp. 959-968 ◽  
Author(s):  
Guislaine Refrégier ◽  
Sandra Pelletier ◽  
Danielle Jaillard ◽  
Herman Höfte
Keyword(s):  
Cell Elongation ◽  
Wall Deposition

Apical control of band elongation in Antithamnion defectum (Ceramiaceae, Rhodophyta)

1988 ◽  
Vol 66 (7) ◽  
pp. 1308-1315 ◽  
Author(s):  
David Garbary ◽  
Daniel Belliveau ◽  
Robert Irwin
Keyword(s):  
Cell Elongation ◽  
Experimental Conditions ◽  
Axial Cell ◽  
Wall Deposition ◽  
Apical Control ◽  
Band Position ◽  
Apical Cells ◽  
In Cells

Cell elongation in the Ceramiaceae typically occurs by means of one or two bands located apically and (or) basally in each cell. In axial cells of Antithamnion defectum two bands are present; however, most cell elongation occurs as a result of new wall deposition in bands at the base of each axial cell. In cells of determinate branches, only the basal band is present. In experimental conditions in which apical cells of indeterminate branches are differentially excised, location of the primary elongation band can be reestablished in relation to remaining indeterminate axes. Thus, the primary elongation band in axial cells is always basal with respect to indeterminate apical cells. When all indeterminate apices are removed, band growth becomes highly disrupted, and diffuse, irregularly located bands are formed. These results suggest that regulation of band position and elongation is through apical control.

scholarly journals Slm9, a Novel Nuclear Protein Involved in Mitotic Control in Fission Yeast

Genetics ◽  
2000 ◽  
Vol 155 (2) ◽  
pp. 623-631
Author(s):  
Junko Kanoh ◽  
Paul Russell
Keyword(s):  
Cell Cycle ◽  
Fission Yeast ◽  
Cell Elongation ◽  
Nuclear Protein ◽  
G1 Arrest ◽  
Permissive Temperature ◽  
Cdc2 Kinase ◽  
Synthetic Lethal ◽  
Cycle Arrest ◽  
Novel Protein

Abstract In the fission yeast Schizosaccharomyces pombe, as in other eukaryotic cells, Cdc2/cyclin B complex is the key regulator of mitosis. Perhaps the most important regulation of Cdc2 is the inhibitory phosphorylation of tyrosine-15 that is catalyzed by Wee1 and Mik1. Cdc25 and Pyp3 phosphatases dephosphorylate tyrosine-15 and activate Cdc2. To isolate novel activators of Cdc2 kinase, we screened synthetic lethal mutants in a cdc25-22 background at the permissive temperature (25°). One of the genes, slm9, encodes a novel protein of 807 amino acids. Slm9 is most similar to Hir2, the histone gene regulator in budding yeast. Slm9 protein level is constant and Slm9 is localized to the nucleus throughout the cell cycle. The slm9 disruptant is delayed at the G2-M transition as indicated by cell elongation and analysis of DNA content. Inactivation of Wee1 fully suppressed the cell elongation phenotype caused by the slm9 mutation. The slm9 mutant is defective in recovery from G1 arrest after nitrogen starvation. The slm9 mutant is also UV sensitive, showing a defect in recovery from the cell cycle arrest after UV irradiation.

scholarly journals Transcriptome and metabolome profiling provide insights into molecular mechanism of pseudostem elongation in banana

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Guiming Deng ◽  
Fangcheng Bi ◽  
Jing Liu ◽  
Weidi He ◽  
Chunyu Li ◽  
...  
Keyword(s):  
Cell Wall ◽  
Cell Elongation ◽  
Molecular Mechanisms ◽  
Specific Gene ◽  
Wild Type ◽  
Banana Plant ◽  
Cell Wall Modification ◽  
Dwarf Cultivar ◽  
Important Trait ◽  
Metabolome Profiling

AbstractBackgroundBanana plant height is an important trait for horticultural practices and semi-dwarf cultivars show better resistance to damages by wind and rain. However, the molecular mechanisms controlling the pseudostem height remain poorly understood. Herein, we studied the molecular changes in the pseudostem of a semi-dwarf banana mutant Aifen No. 1 (Musaspp. Pisang Awak sub-group ABB) as compared to its wild-type dwarf cultivar using a combined transcriptome and metabolome approach.ResultsA total of 127 differentially expressed genes and 48 differentially accumulated metabolites were detected between the mutant and its wild type. Metabolites belonging to amino acid and its derivatives, flavonoids, lignans, coumarins, organic acids, and phenolic acids were up-regulated in the mutant. The transcriptome analysis showed the differential regulation of genes related to the gibberellin pathway, auxin transport, cell elongation, and cell wall modification. Based on the regulation of gibberellin and associated pathway-related genes, we discussed the involvement of gibberellins in pseudostem elongation in the mutant banana. Genes and metabolites associated with cell wall were explored and their involvement in cell extension is discussed.ConclusionsThe results suggest that gibberellins and associated pathways are possibly developing the observed semi-dwarf pseudostem phenotype together with cell elongation and cell wall modification. The findings increase the understanding of the mechanisms underlying banana stem height and provide new clues for further dissection of specific gene functions.

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