Context‐dependency of resource allocation trade‐offs highlights constraints to the evolution of floral longevity in a monocarpic herb
Context‐dependency of resource allocation trade‐offs highlights constraints to the evolution of floral longevity in a monocarpic herb
复制标题
环境——资源分配权衡的依赖性——凸显了对单果草本植物花寿命进化的限制
DOI：
10.1111/nph.15498
复制
发表时间：
2018
期刊：
影响因子：
9.4
通讯作者：
Woodard, Alyssa J.
中科院分区：
文献类型：
--
作者：
Spigler, Rachel B.;Woodard, Alyssa J.
花寿命是花展示的重要组成部分，但对其在物种内进化的实证研究却显着缺乏。花寿命的进化模型基于资源分配理论，并提出选择作用于可遗传变异，以优化寿命的竞争花的建设和维护成本。关键的假设仍然未经测试的野生物种。我们测量了最大的花的寿命，以及雄性先熟期，花的大小，花的数量和开花率在家庭的一次结实的herbSabatia angulocyte高和低资源下生长。我们评估了展示性状之间的遗传变异、可塑性和相关性，包括基本的资源分配权衡及其与资源可用性的相互作用。资源的可用性影响平均花寿命和花数，在这些反应的遗传变异。重要的是，在低资源条件下，花寿命-花数和花数-花大小的权衡都是显著的，并且更强。我们的工作强调了权衡的背景依赖性和可塑性在资源分配中的潜在重要性，当资源高时，植物以更快的速度投资于新花的建设，而不是维持更长寿的花。
Floral longevity is a critical component of floral display, yet there is a conspicuous paucity of empirical research on its evolution within species. Evolutionary models of floral longevity are grounded in resource allocation theory and propose that selection acts on heritable variation to optimize longevity in light of competing floral construction and maintenance costs. Key assumptions remain untested within wild species.We measured maximum floral longevity alongside protandry, flower size, flower number and flowering rate across families of the monocarpic herbSabatia angularisgrown under high and low resources. We evaluated genetic variation, plasticity and correlations between display traits, including fundamental resource–allocation trade‐offs and their interactions with resource availability.All display traits showed significant genetic variation. Resource availability influenced mean floral longevity and flower number, with genetic variation in these responses. Importantly, both floral longevity–flower number and flower number–size trade‐offs were significant and stronger under low resources.This study reinforces the application of resource allocation theory to floral display trait evolution. Our work highlights the context‐dependency of trade‐offs and the potential importance of plasticity in resource allocation, with plants investing in the construction of new flowers at faster rates when resources are high rather than in the maintenance of longer‐lived flowers.