PRF: Cryptic Dioecy: Hypotheses for the Maintenance of Non-functional Floral Parts

这项研究将测试三个具体的假设， 解释了非功能性花药和花粉的维持 在功能性雌性植物Thalumtrum polygamum中产生， 一种秘密雌雄异株的本地多年生植物 系统 花药和花粉的生产可能会留在女性作为一个 昆虫传粉者的奖励，因为选择压力， 增加昆虫访问（适应假说）;作为一个 由于选择保持花药和 花粉生产在男性（即一个强大的，积极的遗传 雄株的花药和花粉产生之间存在相关性 和女性，遗传约束假说）;或作为 祖先的共性状态，因为很少或没有 选择性的好处，他们的去除（即没有“成本”的女性， 花药和花粉的产生，花粉囊假说）。 该项目的第二部分将评估 在T. 一夫多妻制，资源重新分配作为一种 选择性的力量对这种过渡很重要， 风媒传粉的变化。

This research will test three specific hypotheses that may account for the maintenance of non-functional anther and pollen production in functionally female plants of Thalictrum polygamum, a native perennial plant with a cryptically dioecious breeding system. Anther and pollen production may remain in females as a reward for insect pollinators because of selection pressure for increased insect visitation (Adaptation Hypothesis); as a correlated response because of selection maintaining anther and pollen production in males (i.e. a strong, positive genetic correlation exists between anther and pollen production in males and females, Genetic Constraint Hypothesis); or as vestiges of the ancestral cosexual state because there is little or no selective benefit to their removal (i.e. no "cost" to females for production of anthers and pollen, Ancestry Hypothesis). The second portion of this project will evaluate the evolutionary pathway by which dioecy has evolved in the T. polygamun, the possible role of resource reallocation as a selective force important to this transition, and the relevance of wind pollination to the change.