The present invention relates to a yeast strain of the species saccharomyces cerevisiae isolated from spontaneous leavened dough, which is capable of remaining viable at temperatures below 8° C., in an inactive condition with respect to carbon dioxide production, and of resuming a normal fermentative and leavening capacity when shifted to an optimal temperature range. Moreover, the invention relates to solid and fluid doughs, comprising at least water, flour and yeast according to the invention, to the uses of such doughs and their production.