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Journal of Experimental Botany, Vol. 53, No. 373, pp. 1429-1436, June 2002
© 2002 Oxford University Press

Original Papers

{alpha}4-Fucosyltransferase is regulated during flower development: increases in activity are targeted to pollen maturation and pollen tube elongation

Caroline Joly, Renaud Léonard, Abderrahman Maftah and Catherine Riou-Khamlichi1

Glycobiologie et Biotechnologie EA3176, Institut des Sciences de la Vie et de la Santé, Université de Limoges, 123 avenue Albert Thomas, 87060 Limoges Cedex, France

{alpha}4-Fucosylation represents a final step of protein N- glycosylation. {alpha}4-fucosylated N-glycans are thought to be involved in cell-to-cell communication and recognition in primates and plants. Nevertheless, in the plant life cycle, the function of {alpha}4-fucosylation remains largely unknown. To gain an insight into the role of {alpha}4-fucosylation during development, the study focused on tobacco flowers. It is shown that an increase in {alpha}(1,4)fucosyltransferase (Fuc-T) activity is only observed during anther development, whereas it remains at a constant but low level (around 20 pmol Fuc h-1 mg-1 protein) in the gynoecium and perianth. At least a 4-fold higher activity is detected in mature pollen grains. These data suggest that {alpha}(1,4)Fuc-T activity is regulated during anther development. Furthermore, {alpha}(1,4)Fuc-T activity could be required during pollen tube elongation where the activity level peaks at 350 pmol h-1 mg-1 protein. Based on enzyme profile and cycloheximide effects on pollen germination and activity, it is hypothesized that the gene encoding {alpha}4-Fuc-T could be regulated late during pollen development. A potential role of {alpha}4- fucosylation during pollen tube elongation is also discussed.

Key words: Elongation, fucosylation, pollen, tobacco.


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 GlycobiologyHome page
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