Character Variation in Angiosperm Families by Aaron. Goldberg

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By Aaron. Goldberg

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B The avoidance of four-way junctions is hypothesized to be due to the cytoskeleton elements extending from the nucleus to the cortex seeking the shortest distance due to tension during PPB/phragmosome formation. Previous junctions have an out-pocketing which places the cortex in that area farther way from the nucleus tain, are known to be under tension in preprophase (Hahne and Hoffman 1984; Goodbody et al. 1991). Since elements under tension with mobile attachment points will tend to adopt the shortest path across the cell, tension could provide a simple explanation for alignment of the division plane with the cell’s short axis.

Comprehensive analysis of periodically expressed genes has only been performed in suspension cultured cells, which lack many of the developmental pathways that control and interface with cell cycle regulation in intact plants. New technologies, such as laser microdissection microscopy, are increasingly being used to sample the transcript profile, proteome and even metabolites from small numbers of well-defined cells within a tissue context (Nelson et al. 2006). When used with appropriate markers, this approach could be used to 28 P.

2004). This model is similar to the proposal for how MTs form aligned cortical arrays during interphase (Dixit et al. 2006). Although the factors responsible for spatially restricted alterations to MT dynamics/stability needed to bring about PPB formation by either mechanism are largely unknown, members of the MAP65 family of MT bundling proteins, which associate with PPBs in preprophase/prophase cells (Smertenko et al. 2004) may be important for stabilization of PPB MTs. 2 Insights from Genetic and Pharmacological Perturbations One advance in our understanding of how MT lengths are regulated during PPB formation has come from studies of Arabidopsis MOR1.

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