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Journal of Experimental Botany, Vol. 51, No. 343, pp. 299-304, February 2000
© 2000 Oxford University Press

Short Communication

Dehydrin transcript fluctuations during a day/night cycle in drought-stressed sunflower

Françoise Cellier1, Geneviève Conéjéro and Francine Casse

Biochimie et Physiologie Moléculaire des Plantes, INRA/CNRS (URA2133)/ENSA-M/UMII, place Viala, 34060 Montpellier cedex 1, France

To investigate environmental stimuli involved in the modulation of drought-induced gene expression, the influence of the day/night cycle on the expression of two dehydrin genes (HaDhn1 and HaDhn2) in leaves of sunflowers subjected to mild or severe drought stress has been studied. It was observed that the HaDhn1, but not HaDhn2, transcript oscillated in a diurnal fashion. In severely stressed plants, the peak of HaDhn1 mRNA accumulation occurred at midday.

Key words: Dehydrin transcript, drought stress, day/night cycle, sunflower


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