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Baum et al.'s study of primary root development in Arabidopsis shows a dynamic root apical meristem (RAM) in which the number of cells increases and then decreases and the architecture of the initial tiers of cells changes. It begins as a closed system, defined as an organization based on distinct initials, and becomes over time an open system in which common initials are shared by differing cell files. Periclinal divisions forming the middle cortex and the endodermis occur in a spiral sequence, while coordinated divisions of vascular parenchyma cells and pericycle cells form the vascular cambium and the phellogen. (see p. 908)

Reclassifying cultivated potatoes

Huáman and Spooner propose a new classification for landrace populations of cultivated potatoes using cultivar-group names under the International Code of Nomenclature of Cultivated Plants (ICNCP) rather than "Linnean" species designations under the International Code of Botanical Nomenclature (ICBN). They argue for classification of these landraces under a single cultivated species, Solanum tuberosum, because of their reticulate hybrid origins and because of the overlap of most species-specific characters. Further, they present data from the first morphological study of all potato landraces, grown and measured in the living condition in upland Peru. (see p.947)

Using nickel defensively

Martens and Boyd make the first field validation of the defensive role of nickel hyperaccumulation, using the winter annual Streptanthus polygaloides (Brassicaceae) growing on the western side of the Sierra Nevada in California. The phenomenon of nickel hyperaccumulation is known worldwide on high-nickel serpentine soils. With an experimental method that will serve as a model for similar studies elsewhere, they showed that caged plants of differing tissue metal concentrations in a natural setting exhibited differing levels of herbivore damage. (see p. 998)

Grappling with Reid's paradox

Reid's paradox is the observation that mean dispersal distances of most trees and herbs are too small to account for recolonization of northern latitudes following retreat of the glaciers. Using the bog plant Sarracenia purpurea (Sarraceniaceae), whose broad range from Canada to Georgia, is a classic example of Reid's paradox, Ellison and Parker confirm that most seeds disperse within 5 cm of the parent plant and raise important questions about the effect of isolated habitats, like bogs, on long-distance dispersal. (see p. 1024)

This Article Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Search for Related Content