Regulation of Seed Yield in Plantago

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Abstract
The correlation and variation of 4 yield-components are important in regulating seed yield in the genus Plantago. Negative correlations between weight per seed and seed number per capsule, and between the capsule number per inflorescence and the inflorescence number per plant, are evident among 30 spp. These compromises have limited the variation in total seed yield per plant during speciation. Investigations of variation within populations using random samples, and within species using herbarium material, reveal that correlations between yield-components are positive or neutral, suggesting that phenotypic plasticity in yield-components is important in allowing plants to regulate their seed production in relation to the immediate environment. In order of increasing importance in the regulation of seed production, both within populations and within species, are seed number per capsule, weight per seed, capsule number per inflorescence and inflorescence number per plant.

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