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Journal of Experimental Botany, Vol. 53, No. 373, pp. 1463-1473, June 2002
© 2002 Oxford University Press

Original Papers

Involvement of polyamines in root development at low temperature in the subantarctic cruciferous species Pringlea antiscorbutica

Irène Hummel, Ivan Couée1, Abdelhak El Amrani, Josette Martin-Tanguy and Françoise Hennion

Université de Rennes 1, Centre National de la Recherche Scientifique, UMR 6553, Campus de Beaulieu, Bâtiment 14, 263 avenue du Général Leclerc, F-35042 Rennes Cedex, France

Polyamine involvement in root development at low temperature was studied in seedlings of Pringlea antiscorbutica R. Br. This unique endemic cruciferous species from the subantarctic zone is subjected to strong environmental constraints and shows high polyamine contents. In the present study, free polyamine levels were modified by inhibitors of polyamine biosynthesis (D-arginine, difluoromethylornithine, cyclohexylammonium, and methylglyoxal-bis-guanylhydrazone) and variations of the endogenous pools were compared to changes in root growth. The arginine decarboxylase pathway, rather than that of ornithine decarboxylase, seemed to play a major role in polyamine synthesis in Pringlea antiscorbutica seedlings. Root, but not shoot, phenotypes were greatly affected by these treatments, which modified polyamine endogenous levels according to their expected effects. A positive correlation was found between agmatine level and growth rate of the primary root. Spermidine and spermine contents also showed positive correlations with primary root growth whereas the putrescine level showed neutral or negative effects on this trait. Free polyamines were therefore found to be differentially involved in the phenotypic plasticity of root architecture. A comparison of developmental effects and physiological concentrations suggested that agmatine and spermine in particular may play a significant role in the control of root development.

Key words: Agmatine, low temperature, polyamines, Pringlea antiscorbutica, root development.


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