Cover illustration: The inset photograph shows an Alstroemeria var Rebecca cyme overlayed on analysis graphs of microarray data generated using GENESPRING version 5.1 (Silicon Genetics). Microarrays were used to identify changes in gene expression during petal senescence of Alstroemeria flowers. The processes and molecular mechanisms of programmed cell death and senescence in floral organs are reviewed in Rogers (pp. 309–315).
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