Contents

16 November 1990
Vol 250, Issue 4983

About The Cover

Shown is a wild-type flower of Antirrhinum majus (snapdragon), a plant used for genetic and molecular studies of the mechanisms of flower development. Lower parts of the corrolla leaves have been removed, revealing reproductive organs (the pistil and four stamens). Z. Schwarz-Sommer et al. have studied homeotic genes in Antirrhinum majus (page 931). In this issue is a collection of articles that describe progress in understanding molecular aspects of plant biology. See page 923 to 966. [Photograph by Dietrich Bock]