Warren John, Mackenzie Sally
Institute of Rural Studies, Llanbadarn Fawr , University of Wales, Aberystwyth, Ceredigion SY23 3AL, UK.
Conservation and Ecology Department, SAC Aberdeen, Craibstone, Bucksburn, Aberdeen AB2 9TS, UK.
New Phytol. 2001 Jul;151(1):237-241. doi: 10.1046/j.1469-8137.2001.00159.x.
• Flower-colour polymorphism within the British flora appears more common in species whose flowers typically contain pink, purple or blue anthocyanin pigments rather than other coloured pigments. In this study we test the hypothesis that this variation in anthocyanin pigmentation may be maintained by selection related to environmental heterogeneity and stress tolerance. • Observations were made of stem pigmentation, shoot dry mass and seed production in five polymorphic species under different droughted and well watered conditions. • The results show that over both treatments the morphs did not differ in their fitness. However, a significant morph times treatment interaction revealed that the pigmented plants performed relatively better in the droughted conditions, while the unpigmented plants performed relatively better in the well watered treatment. • The results support the idea that anthocyanin based flower-colour polymorphisms may be better considered as polymorphism for the presence or absence of anthocyanin pigmentation throughout the entire plant. This variation may be maintained by selection related to environmental heterogeneity and stress tolerance.
• 在英国植物群中，花色多态性在那些花朵通常含有粉色、紫色或蓝色花青素色素而非其他颜色色素的物种中似乎更为常见。在本研究中，我们检验了这样一个假设：花青素色素沉着的这种变化可能通过与环境异质性和胁迫耐受性相关的选择得以维持。
• 对五个多态性物种在不同干旱和充分浇水条件下的茎色素沉着、地上部干质量和种子产量进行了观察。
• 结果表明，在两种处理下，不同形态的适合度没有差异。然而，显著的形态×处理交互作用表明，有色素的植株在干旱条件下表现相对较好，而无色素的植株在充分浇水处理下表现相对较好。
• 这些结果支持了这样一种观点，即基于花青素的花色多态性可能更好地被视为整个植株中花青素色素沉着存在与否的多态性。这种变化可能通过与环境异质性和胁迫耐受性相关的选择得以维持。
