Seed maturation: genetic programmes and control signals

Seed maturation is mainly governed by a few genes best studied in maize and Arabidopsis. The isolation of the LEC1 and FUS3 genes, besides the previou sly known VP1/ABI3 genes, and their identification as transcriptional regul ators provides the first direct hints as to their molecular mode of action. With the identification of new effector genes, the investigation of the ro le of hormones with new methods such as immunomodulation and the increasing ly recognised role of metabolites like sugars as important modulators of se ed development, we increasingly understand the complexity and structure of the regulatory network underlying seed maturation.