1984. Agc and temperature effects on saturation of leaf fatty acids of SmiJLlrgcl cernua, an arctic herb. Can. J. Bot. 62: 1018-1021. Leaves from 90-day-old Snrifraga cernua plants which had been grown at 10°C had more linolenic acid and less linoleic, oleic, and palmitic acids than did leaves from plants grown at 20°C. When the linolenic acid content of thc leaves was measured over the entire life cycle, the plants reached 66 days of age before the linolenic acid content was greater in 10°C-grown plants than in 20°C-grown plants. Plants grown at 20°C, which had been shifted to 10°C for 4 days, generally had more linolenic acid than plants grown continually at 20°C, but there were few statistically significant differences. Larger increases tended to occur in plants which were older than 58 days at the time of the temperature shift. The corresponding shift of 10°C-grown plants to 20°C for 4 days resulted in inconsistent differences in linolenic acid content. MARIE, B. A. H., et W. R. CUMMINS. 1984. Age and temperature effects on saturation of leaf fatty acids of Sa.rifraga cernun, an arctic herb. Can. J. Bot. 62: 1018-1021. Les plants de Sa.rifraga cernua Bges de 90 jours ont plus d'acide linolenique et moins d'acides linolCique, oliique et palmitique dans leurs feuilles lorsqu'ils sont cultivts B 10 plut6t qu'a 20°C. Lorsque la teneur en acide IinolCnique des feuillcsest mesurCe pendant tout le cycle de la plante, elle devient plus ClevCe chez les plantes cultivies a 10°C que chcz celles cultivies a 20°C quand I'2ge des plantes atteint 66 jours. Les plantes cultivCes 20°C, mais qui sont plackes a 10°C pendant 4 jours, ont gCnCralement plus d'acide linolknique que les plantes qui restent continuellement i 20°C, mais peu de ces differences sont statistiquement significatives. L'augmentation de I'acide linolenique a tendance a &tre plus forte chez les plantes qui sont BgCes de plus de 58 jours lorsqu'elles reqoivent le traitement de 4 jours a 10°C. Chez les plantes cultivCes a 10 mais placCes a 20°C pendant 4 jours, les difftrences qui apparaissent dans la teneur en acide IinolCnique sont imprCvisibles.[Traduit par le journal]