Fire effects on plant reproductive fitness vary among individuals reflecting pollination‐dependent mechanisms
Fire effects on plant reproductive fitness vary among individuals reflecting pollination‐dependent mechanisms
复制标题
火灾对植物繁殖适应性的影响因个体而异，反映了授粉依赖机制
DOI：
10.1002/ajb2.16160
复制
发表时间：
2023
影响因子：
3
通讯作者：
Wagenius, Stuart
中科院分区：
文献类型：
--
作者：
Richardson, Lea K.;Beck, Jared;Eck, Daniel J.;Shaw, Ruth;Wagenius, Stuart
PremiseFire在世界范围内的许多植物物种中诱导开花，通过更大的资源可用性可能改善生殖适合度，如开花努力所证明的，以及改善授粉结果，如结实所证明的。火后开花同步性的增加，从而交配机会，可能会改善授粉。然而，很少有研究评估火灾对健身多个组成部分的影响。因此，火灾对生殖fitness的影响的程度和机制仍然不清楚。MethodsOver多年来，规定烧伤在草原保护区，我们算花茎，花，果实，和种子的三个草原多年生植物，狭叶紫锥菊，Liatris aspera，和一枝黄花speciosa。我们使用aster生活史模型来评估火灾和交配机会如何影响每年的母亲健身和其组成部分在个别plants.ResultsInEchinaceaandLiatris，但不是在一枝黄花，火灾增加头数，火灾和交配机会增加母亲健身。尽管结实率低（受精率），但有许多花头的焚烧紫锥菊和Liatris植物产生了许多种子。与此相反，植物的平均数量的花头有高的种子集，并产生了许多种子，只有当交配机会丰富。ConclusionsFire通过资源和授粉依赖的机制在松果菊和Liatris增加年度生殖适合度，但没有影响Solidagofitness。同步性和结实率之间的一致关系意味着时间交配机会在授粉过程中起着重要作用。虽然火促进了许多植物物种的开花，但我们的研究结果表明，即使是密切相关的物种也对火表现出不同的反应，这可能会影响更广泛的植物群落。
PremiseFire induces flowering in many plant species worldwide, potentially improving reproductive fitness via greater availability of resources, as evident by flowering effort, and improved pollination outcomes, as evident by seed set. Postfire increases in flowering synchrony, and thus mating opportunities, may improve pollination. However, few studies evaluate fire effects on multiple components of fitness. Consequently, the magnitude and mechanism of fire effects on reproductive fitness remain unclear.MethodsOver multiple years and prescribed burns in a prairie preserve, we counted flowering stems, flowers, fruits, and seeds of three prairie perennials,Echinacea angustifolia,Liatris aspera, andSolidago speciosa. We used aster life‐history models to assess how fire and mating opportunities influenced annual maternal fitness and its components in individual plants.ResultsInEchinaceaandLiatris, but not inSolidago, fire increased head counts, and both fire and mating opportunities increased maternal fitness. BurnedEchinaceaandLiatrisplants with many flower heads produced many seeds despite low seed set (fertilization rates). In contrast, plants with an average number of flower heads had high seed set and produced many seeds only when mating opportunities were abundant.ConclusionsFire increased annual reproductive fitness via resource‐ and pollination‐dependent mechanisms inEchinaceaandLiatrisbut did not affectSolidagofitness. The consistent relationship between synchrony and seed set implies that temporal mating opportunities play an important role in pollination. While fire promotes flowering in many plant species, our results reveal that even closely related species exhibit differential responses to fire, which could impact the broader plant community.