花朵的绊倒机制影响花粉传递动力学

Q3 Agricultural and Biological Sciences Journal of Pollination Ecology Pub Date : 2024-01-19 DOI:10.26786/1920-7603(2023)770
Molly Dieterich Mabin, Connor Slawin, Amy-Mei Lynch, F. Fragoso, Johanne Brunet
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引用次数: 0

摘要

昆虫授粉者会影响花粉传递动力学,从而对花粉移动和植物种群的遗传结构产生影响。以前从未研究过具有绊倒机制的花朵的花粉转移动态。在这里,我们研究了蜜蜂身上积累的花粉是否会随着在一次觅食过程中被 Bombus impatiens Cresson 绊倒的 Medicago sativa L. 花朵数量的增加而增加,同时控制了蜜蜂的体型和访问的花朵数量。在第二个实验中,我们确定重访被绊倒花朵的次数是否会增加花粉在柱头上的沉积。我们在温室中设置了三株总状花序数量可控的 M. sativa 植物,并在蜜蜂觅食时跟踪它们,记录每株植物、总状花序和访问的花朵。对于花粉的积累,我们在蜜蜂觅食结束时收集它们,并计算它们身上的花粉粒。对于花粉的沉积,我们收集重访次数在 0 到 6 次之间的花朵,并计算柱头上的花粉粒。蜜蜂身体上的花粉粒数量随着觅食过程中被绊倒的花朵数量的增加而增加,但并不受访问花朵数量或蜜蜂个体大小的影响。沉积在柱头上的花粉粒数量并不随重访被绊倒的花朵的次数而增加。后一种结果与没有绊倒机制的植物形成了鲜明对比,在没有绊倒机制的植物中,重访次数会增加花粉沉积和结籽。绊倒会影响花粉转移的动态,我们将讨论它的影响如何随着绊倒方式的不同而变化。
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The tripping mechanism of flowers affects pollen transfer dynamics
Insect pollinators affect pollen transfer dynamics, with consequences for pollen movement and the genetic structure of plant populations. Pollen transfer dynamics has not been previously examined in flowers with a tripping mechanism. Here we examine whether pollen accumulated on a bee’s body increases with the number of Medicago sativa L. flowers tripped by Bombus impatiens Cresson during a foraging bout, while controlling for bee body size and number of visited flowers. In a second experiment, we determine whether the number of revisits to a tripped flower increases pollen deposition onto the stigmas. We set up three M. sativa plants with a controlled number of racemes in a greenhouse room, and followed individual bees as they foraged, recording each plant, raceme, and flower visited. For pollen accumulated, we collected bees at the end of their foraging bout and counted pollen grains on their body. For pollen deposition, we collected flowers with between 0 and 6 revisits and counted the pollen grains on the stigmas. The number of pollen grains on a bee’s body increased with the number of flowers tripped in a foraging bout, but was not affected by the number of flowers visited or the size of individual bees. The number of pollen grains deposited on a stigma did not increase with the number of revisits to a tripped flower. This latter result contrasts with plants without a tripping mechanism where the number of visits increases pollen deposition and seed set. Tripping affects pollen transfer dynamics and we discuss how its effect may vary with the mode of tripping.
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来源期刊
Journal of Pollination Ecology
Journal of Pollination Ecology Environmental Science-Ecology
CiteScore
1.50
自引率
0.00%
发文量
17
审稿时长
17 weeks
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