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首页> 外文期刊>International journal of plant sciences >BEYOND SIMPLE REPRODUCTIVE ASSURANCE: CLEISTOGAMY ALLOWS ADAPTIVE PLASTIC RESPONSES TO POLLEN LIMITATION
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BEYOND SIMPLE REPRODUCTIVE ASSURANCE: CLEISTOGAMY ALLOWS ADAPTIVE PLASTIC RESPONSES TO POLLEN LIMITATION

机译：超越简单的生殖保障：卵裂畸形允许对花粉限制采取适应性塑料反应

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Historically, the persistence of mixed mating (reproduction via both self- and cross-fertilization) has presented a puzzle because classic theory predicts that mixed mating should be evolutionarily unstable. One mechanism that could contribute to the maintenance of mixed mating in cleistogamous species is the ability to invest in the appropriate type of reproduction (outcrossing vs. selfing) for a given pollination environment. We tested whether Collomia grandiflora plants responded to pollen limitation by plastically shifting relative investment in cleistogamous (obligately self-fertilizing) versus chasmogamous (potentially outcrossing) reproduction. We estimated reproductive effort (seed production) for chasmogamous and cleistogamous reproductive modes in hand-pollinated and unpollinated plants. We also investigated whether plastic responses to pollen limitation could be constrained by water availability or early nutrient fertilization. Pollen limitation significantly increased cleistogamous reproductive effort, and responses were consistent across gradients of water availability and soil fertility. Our results suggest that dimorphic cleistogamy can provide more than a fixed level of reproductive assurance, as plasticity in allocation to cleistogamy versus chasmogamy can simultaneously enable outcrossing when pollinators are abundant and increase selfing when pollinators are scarce. We argue that such plasticity could be a factor in the evolutionary maintenance of mixed mating in cleistogamous plants.
机译：从历史上看，混合交配的持久性（通过自我和交叉受精繁殖）一直是一个难题，因为经典理论预测混合交配在进化上应该是不稳定的。可能有助于维持配伍物种混合交配的一种机制是针对给定授粉环境投资适当类型的繁殖的能力（异交与自交）。我们测试了大花哥伦比亚植物是否通过塑性改变相对于无性繁殖（可能自交）繁殖相对于无性繁殖（专心自肥）的相对投资来响应花粉限制。我们估计了人工授粉和未授粉植物的异性繁殖和生殖繁殖方式的生殖努力（种子生产）。我们还调查了对花粉限制的塑性反应是否可以通过水的供应或早期的养分施肥来限制。花粉限制显着增加了多妻制生殖能力，并且在水可利用量和土壤肥力梯度之间的响应是一致的。我们的研究结果表明，双态变态的配种可以提供比固定水平更高的生殖保证，因为授粉者丰富时，分配给可育和变态的可塑性可以同时实现异种杂交，而缺乏传粉者则可以增加自交。我们认为，这种可塑性可能是在杂种植物中混合交配的进化维持的一个因素。

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