Cover illustration: Plant reproduction in flowering plants involves a number of key events. The top picture shows pollen tubes from a pollinated stigma, stained with aniline blue to show the callose in the walls and plugs, which is laid down at intervals as it grows. (Image: Noni Franklin-Tong.) The middle image shows a bee pollinating a flower of Papaver rhoeas, the field poppy. Because of a self-incompatibility mechanism operating in this species, `self' pollen is rejected. (Photo: Noni Franklin-Tong.) The male gametes contained in pollen are the products of meiosis. The bottom image shows Arabidopsis thaliana meiotic metaphase I chromosomes stained with dual fluorescence in situ hybridization (FISH) of telomere (red) and paracentromeric heterochromatin (green) probes. (Image: SJ Amstrong.)
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