Cover illustration: The inset cover shows the intermediate floral mutant of barley (right) compared to single-floreted spikelet of wildtype barley (left). A barley phytomer model is proposed, in which the origins of vegetative and generative structures can be explained by a single repeating phytomer unit. The model can be applied to wheat and related grasses. See Forster et al. (pp. 725-733).
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