Inbreeding Reduces Floral Longevity and Flower Size in the Mixed-Mating Biennial Sabatia angularis
Inbreeding Reduces Floral Longevity and Flower Size in the Mixed-Mating Biennial Sabatia angularis
复制标题
DOI：
10.1086/724030
复制
发表时间：
2023-03-01
影响因子：
2.3
通讯作者：
Charles，Annmarie
中科院分区：
文献类型：
--
作者：
Spigler，Rachel B.;Charles，Annmarie
研究进展：众所周知，近交衰退有助于维持开花植物的异交，因为它对发芽、存活和生育力有直接的负面影响。 然而，近亲繁殖衰退也可能通过影响控制生物相互作用的性状而间接影响适应性。关于授粉成功相关性状的近交衰退，人们知之甚少。虽然通常与传粉者的吸引力或奖励有关，但传粉成功也取决于花的寿命。花寿命的近交衰退还没有被研究过，但有可能复合授粉面临的自交plants.Methodology.We调查了近交衰退的性状相关的授粉成功在混合交配的两年生Sabatia angulinaL. （Pursh）（龙胆科（Gentianaceae））。在受控的、无传粉者的条件下，我们进行杂交以创建自交和异交种子的家庭，并将这些植物培育成花朵。我们比较了自交和异交个体的以下性状：花数，花大小，花冠寿命，柱头寿命和株高。我们还考虑了近交衰退是否受到花数寿命权衡或植物大小的影响。初步结果：根据花冠和柱头寿命，自交植物产生的花明显较小，寿命明显短于异交植物的花。 与以前的工作一致，我们发现花的寿命和花的数量之间的权衡和寿命和株高之间的正相关关系。然而，我们没有发现近亲繁殖对花的数量或植株大小的抑制。结论：我们发现了新的证据表明近亲繁殖降低了花的寿命和花的大小。 尽管这些性状的近交衰退程度中等，但可能会使自交植物在花粉有限的环境中处于不利地位，特别是在花粉输出速度超过沉积速度，导致植物被迫依赖传粉者来产生种子的情况下。我们的工作有助于我们了解近交衰退如何改变植物传粉者相互作用的结果，并提出了有关其对生殖分配的影响的问题。
Premise of research. Inbreeding depression is well known to contribute to the maintenance of outcrossing in flowering plants because of its direct negative impacts on germination, survival, and fertility. Yet inbreeding depression could also impact fitness indirectly by affecting traits that govern biotic interactions. Relatively little is known about inbreeding depression on traits related to pollination success. Although often associated with pollinator attraction or reward, pollination success is also determined by floral longevity. Inbreeding depression in floral longevity has not been studied but has the potential to compound pollination disadvantages confronting inbred plants.Methodology. We investigated inbreeding depression for traits related to pollination success in the mixed-mating biennialSabatia angularisL. (Pursh) (Gentianaceae). Under controlled, pollinator-free conditions, we performed crosses to create families of selfed and outcross seed and raised these plants to flower. We compared selfed and outcrossed individuals for the following traits: flower number, flower size, corolla longevity, stigma longevity, and plant height. We also considered whether inbreeding depression was influenced by flower number–longevity trade-offs or plant size.Pivotal results. Selfed plants produced significantly smaller flowers that lived for a significantly shorter amount of time than flowers of outcrossed plants, based on corolla and stigma longevity. Consistent with prior work, we found trade-offs between floral longevity and flower number and positive relationships between longevity and plant height. However, we did not detect inbreeding depression for flower number or plant size.Conclusions. We find novel evidence that inbreeding reduces both floral longevity and flower size. Although moderate, inbreeding depression for these traits could leave selfed plants at a disadvantage in pollen-limited environments, especially where rates of pollen export outpace deposition such that plants are forced to rely on pollinators for seed production. Our work contributes to our understanding of how inbreeding depression can alter plant-pollinator interaction outcomes and raises questions about its influence on reproductive allocation.