Cover illustration: The cover photograph depicts a 3-day-old maize (Zea mays) seedling germinated in a paper roll. At this early stage of root development only the primary root and its root hairs are visible. The current status of the genetic analysis of root formation in maize is highlighted in a review by Hochholdinger et al. See pp. 359–368. Photograph is by Katrin Woll.
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