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Sugars regulate cold-induced gene expression and freezing-tolerance in barley cell cultures

Lookup NU author(s): Dr Roger Pearce


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The hypothesis that the extracellular concentration of sugars helps regulate the acclimation of plant cells to cold was tested in this work. Suspension cultures were used to control the concentration of sugars in the medium supplied to barley cell cultures (Hordeum vulgare L. cv. Igri), replacing the medium daily to help maintain the concentration. Freezing tolerance and the levels of mRNA expression of the stress-response genes blt4.9 (coding for a non-specific lipid transfer protein) and dhn1 (coding for a dehydrin) were measured. Similar levels of freezing-tolerance and gene expression were obtained in the experiments as occur during cold-acclimation in the crown of the whole plant. In the cell cultures, cold (6/2°C) did not induce an increase in freezing tolerance or in the expression of detectable levels of blt4.9 or dhn1 mRNAs when only 1 g l-1 sucrose was supplied. However, the cells in this low sucrose medium in the cold were not sugar-starved, indicating that this did not explain the failure of the cells to acclimate when grown in the cold environment. Ten g l-1 sucrose supplied to cells grown in the warm (25°C) induced acclimation to freezing and up-regulation of expression of blt4.9 and dhn1 mRNAs. Osmolality of the medium did not explain this. Thirty g l-1 sucrose induced yet higher levels of freezing tolerance and of blt4.9 and dhn1 mRNAs in cultures grown in either the cold or the warm environment. The results implicate sugars in the regulation of cold acclimation.

Publication metadata

Author(s): Reza Tabaei-Aghdaei S, Pearce RS, Harrison P

Publication type: Article

Publication status: Published

Journal: Journal of Experimental Botany

Year: 2003

Volume: 54

Issue: 387

Pages: 1565-1575

ISSN (print): 0022-0957

ISSN (electronic): 1460-2431

Publisher: Oxford University Press


DOI: 10.1093/jxb/erg173

PubMed id: 12730262


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