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Lazzaro describes the organization of microtubules in the pollen grain and tube of spruce using confocal scanning and transmission electron microscopy. His remarkable micrographs illustrate important functional differences in microtubule organization within conifer pollen compared to the angiosperm model systems and, intriguingly, similarity to microtubule organization in tip growing cells of ferns. (see p. 759)

DNA amplification in developing cotton fiber cells

Van't Hof, using a novel method to isolate fiber cell nuclei that permits measurement of the nuclear DNA content by fluorescence, shows that the cell's nucleus increases its DNA content by about 24% preceding accelerated fiber growth and discusses the possible mechanisms involved. (see p. 776)

Dynamic root plasticity in Polygonum

Using computer-digitized tracings of roots, Bell and Sultan demonstrate dramatic and rapid root plasticity of the widespread weed Polygonum persicaria over time in response to changes in the amount and location of soil moisture. Their study compares these responses to those of a more ecologically restricted congener, P. cespitosum. (see p. 807)

Robinson Crusoe Island endemic

Lactoris fernandeziana is the sole representative of the ancient family Lactoridaceae. This species resides only on one small island in the famous southern Pacific archipelago of Juan Fernandez, off the coast of Chile. Bernardello et al. describe and discuss the reproductive biology of this unique species. (see p. 829)

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