PMID: 11607292May 15, 1992Paper

Extension growth of the water mold Achlya: interplay of turgor and wall strength

Proceedings of the National Academy of Sciences of the United States of America
N P Money, F M Harold

Abstract

When hyphae of the water mold Achlya were subjected to osmotic stress, imposed with polyethylene glycol (PEG)-300 or sucrose, turgor pressure fell in proportion to the increase in external osmotic pressure. There was no evidence of turgor regulation, even over a period of days, yet the extension rate was unaffected until turgor was reduced to less than a third of the normal level of 0.6-0.8 MPa (6-8 bars). Measurements of the pressure at which the hyphae burst indicate that they respond to osmotic stress by softening their apical cell walls, sustaining extension growth despite reduced turgor pressure. The effect of osmolytes excluded by the wall was very different; superfusion of growing hyphae with PEG-6000 or dextran-6000 reduced turgor and stopped extension but did not induce wall softening. Furthermore, the hyphae did not resume growth during an hour or more of continuous exposure to these substances. Although the two classes of osmolytes have the same effect on turgor, they may induce different strains within the cell wall; this might then affect the capacity of the organism to detect the drop in turgor or to soften its cell wall. The interplay between turgor and wall strength supports the proposition that turgor supplies ...Continue Reading

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Citations

Nov 15, 2002·Fungal Genetics and Biology : FG & B·Franklin M Harold
Jan 1, 1997·Annual Review of Cell and Developmental Biology·D J Cosgrove
Nov 29, 2011·International Journal of Microbiology·Alexandra Brand
Sep 10, 2013·Journal of Experimental Botany·Amir Sanati Nezhad, Anja Geitmann
Oct 5, 2010·Trends in Cell Biology·Gregory Jedd
Apr 9, 2008·Seminars in Cell & Developmental Biology·T J MitchisonL Mahadevan
Oct 7, 2004·Fungal Genetics and Biology : FG & B·Roger R LewAshley Garrill
May 4, 2002·Annual Review of Biophysics and Biomolecular Structure·Martin BastmeyerClemens Bechinger
Dec 10, 1999·Fungal Genetics and Biology : FG & B·I B Heath, G Steinberg
Aug 4, 2004·Fungal Genetics and Biology : FG & B·Nicholas P MoneyJ P Ravishankar
Sep 28, 2000·Journal of Experimental Botany·T E ProseusJ S Boyer
May 20, 2005·Nature·Guillaume T CharrasT J Mitchison
Sep 1, 2012·American Journal of Botany·Otger CampàsL Mahadevan
Jun 7, 2011·Nature Reviews. Microbiology·Roger R Lew
Jun 27, 2001·Applied and Environmental Microbiology·C P Selitrennikoff
Jan 26, 2017·Journal of Peptide Science : an Official Publication of the European Peptide Society·Kusum SinghSharmistha Dey
Jan 30, 2007·Eukaryotic Cell·Gero Steinberg
Sep 19, 2014·Plant Physiology·Jan KnoblauchMichael Knoblauch
Feb 1, 1997·Fungal Genetics and Biology : FG & B·G D Gupta, I B Heath
Sep 8, 2021·The New Phytologist·Jacques Dumais
Oct 1, 2021·Molecular Microbiology·Tina Bedekovic, Alexandra C Brand

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