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首页> 外文期刊>American Journal of Botany >Morphological variation and female reproductive success in two sympatric Trillium species: evidence for phenotypic selection in Trillium erectum and Trillium grandiflorum (Liliaceae)
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Morphological variation and female reproductive success in two sympatric Trillium species: evidence for phenotypic selection in Trillium erectum and Trillium grandiflorum (Liliaceae)

机译：两种同胞延龄草属物种的形态学变异和女性生殖成功：直立延龄草和延龄草延龄草（百合科）的表型选择证据

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摘要

I investigated the mating systems and phenotypic variation of two sympatric spring ephemerals, Trillium erectum and T. grandiflorum (Liliaceae), and phenotypic selection acting through female reproductive success for 11 morphological characters in five sympatric populations of the two species. I examined the degree of self-compatibility, pollinator-visitation rates, and pollen limitation of fruit and seed production in both species. Both Trillium species were self-compatible, but outcrossed flowers produced more successful fruits and seeds than self-pollinated flowers. Pollinator-visitation rates to the two species were low compared to other insect-pollinated spring ephemerals. In addition, both T. erectum and T. grandiflorum experienced pollen limitation in fruit and/or seed production; however, levels of fecundity in both species may be influenced by resource availability as well. I found significant phenotypic variation in 11 morphological characters within and among the five study populations. The sizes of all morphological characters were positively correlated. In general, larger T. erectum and T. grandiflorum produced more seeds. Phenotypic selection analysis revealed that direct and indirect selection acted on the size of morphological characters for both species. But there was no detectable selection acting on plant shape. This study reveals that variation in plant size exists within and among populations of both species, and this variation is associated with variance in female reproductive success. Spatial and temporal variation in pollinator and/or resource abundance may play a role in the phenotypic variation exhibited by both Trillium species.
机译：我研究了两个同伴的春季短暂性状，延龄草和大花丹草（百合科）的交配系统和表型变异，以及通过雌性 同胞种群中11个形态特征的>生殖成功。我检查了两个物种中水果和种子生产的自我相容性程度，授粉者访视率以及花粉限制。两种 延龄草属物种都是自相容的，但异花 比自花授粉的 产生的果实和种子更成功。与其他昆虫已授粉的春季短暂植物相比，这两个物种的授粉访花率 低。在 中，直立木和大花木都在果实和/或种子生产中受花粉限制。但是，两个物种的繁殖力水平 也可能受到资源可用性 的影响。我在五个研究人群中和五个研究人群中发现了11个形态特征上的显着表型变异。所有形态特征的 大小呈正相关。 通常，较大的直立木和大花黄豆产生更多的 种子。表型选择分析表明，直接选择和 间接选择对两种物种的形态特征 大小都有影响。但是没有可检测的选择对植物的形状起作用 。这项研究表明，两个物种的种群内部和种群之间都存在植物大小的变异，而这种变异与雌性繁殖成功的变异有关。传粉媒介和/或 资源丰富度的时空变化可能在两种延龄草属物种表现出的表型变化 中起作用。

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