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Discovery of Octopamine and Tyramine in Nectar and Their Effects on Bumblebee Behavior.

iScience(2022)SCI 2区

Univ Texas Austin | Univ Nevada

Cited 13|Views24
Abstract
Nectar chemistry can influence the behavior of pollinators in ways that affect pollen transfer, yet basic questions about how nectar chemical diversity impacts plant-pollinator relationships remain unexplored. For example, plants' capacity to produce neurotransmitters and endocrine disruptors may offer a means to manipulate pollinator behavior. We surveyed 15 plant species and discovered that two insect neurotransmitters, octopamine and tyramine, were widely distributed in floral nectar. We detected the highest concentration of these chemicals in Citrus, alongside the well-studied alkaloid caffeine. We explored the separate and interactive effects of these chemicals on insect pollinators in a series of behavioral experiments on bumblebees (Bombus impatiens). We found that octopamine and tyramine interacted with caffeine to alter key aspects of bee behavior relevant to plant fitness (sucrose responsiveness, long-term memory, and floral preferences). These results provide evidence for a means by which synergistic or antagonistic nectar chemistry might influence pollinators.
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Ethology,Neuroscience,Plant biology,Interaction of plants with organisms
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要点】:研究发现花蜜中的神经递质octopamine和tyramine,并证实它们与已知物质咖啡因共同作用能改变大黄蜂的行为,影响植物授粉效率。

方法】:通过调查15种植物的花蜜,分析其中的化学成分,并在实验中对大黄蜂的行为进行测试。

实验】:在一系列行为实验中,研究了octopamine和tyramine单独及与咖啡因共同作用下对大黄蜂(Bombus impatiens)的蔗糖响应性、长期记忆和花朵偏好性的影响,使用的数据集为实验观察记录。