Annual Plant Reviews, Volume 12 A fundamental feature of developmental biology is that of the establishment of polarity. It can be described at different levels - polarity of the organism, polarity in tissue patterning and organ development, and polarity of the cell. This volume provides an account of current research into the mechanisms by which polarity is generated at the level of the cell, organ and organism in plants, drawing especially on recent work with model organisms. The emphasis is on the use of the techniques of molecular genetics to dissect molecular mechanisms. This is the first volume to bring together the diverse aspects of polarity in plant development. It is directed at researchers and professionals in plant developmental biology, cell biology and molecular biology. Visit www. blackwellplantsci. com the plant science site from Blackwell Publishing.