Resource Allocation and Seed Size Selection in Perennial Plants under Pollen Limitation
Resource Allocation and Seed Size Selection in Perennial Plants under Pollen Limitation
复制标题
花粉限制下多年生植物的资源分配和种子大小选择
DOI：
10.1086/692543
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发表时间：
2017-09-01
影响因子：
2.9
通讯作者：
Fan, Zhiwei
中科院分区：
文献类型：
--
作者：
Huang, Qiaoqiao;Burd, Martin;Fan, Zhiwei
花粉限制可能影响植物资源分配模式，但其在种子大小选择中的作用尚不清楚。利用多年生菊科植物资源配置的进化稳定策略模型，我们发现在不依赖于密度的种群生长条件下，花粉限制（即降低胚珠受精率）会增加最优种子大小。在任何花粉限制水平（包括无花粉限制）下，最佳种子大小使幼虫存活率与产生一粒种子所需的资源投资（包括胚珠产生和种子供应）之比最大化；即最优是单位成本的适应度效果最大化。种子投资可能影响配种后成虫存活率。在我们的模型中，花粉限制增加了个体种子大小，但减少了总体生殖分配，因此花粉限制也应该增加了对交配后成虫存活的最优分配。在密度依赖性种群生长条件下，最佳种子大小与胚珠受精率成反比。然而，花粉限制并不影响育种后成虫存活和胚珠生产的最佳分配。这些结果强调了花粉限制对多年生植物种子大小和繁殖后成虫存活的生态学和进化的影响中分配权衡的重要性。
Pollen limitation may affect resource allocation patterns in plants, but its role in the selection of seed size is not known. Using an evolutionarily stable strategy model of resource allocation in perennial iteroparous plants, we show that under density-independent population growth, pollen limitation (i.e., a reduction in ovule fertilization rate) should increase the optimal seed size. At any level of pollen limitation (including none), the optimal seed size maximizes the ratio of juvenile survival rate to the resource investment needed to produce one seed (including both ovule production and seed provisioning); that is, the optimum maximizes the fitness effect per unit cost. Seed investment may affect allocation to postbreeding adult survival. In our model, pollen limitation increases individual seed size but decreases overall reproductive allocation, so that pollen limitation should also increase the optimal allocation to postbreeding adult survival. Under density-dependent population growth, the optimal seed size is inversely proportional to ovule fertilization rate. However, pollen limitation does not affect the optimal allocation to postbreeding adult survival and ovule production. These results highlight the importance of allocation trade-offs in the effect pollen limitation has on the ecology and evolution of seed size and postbreeding adult survival in perennial plants.