Short-wavelength light guides many behaviors that are crucial for an insect's survival. In Drosophila melanogaster, short-wavelength light induces both attraction and avoidance behaviors. How light cues evoke two opposite valences of behavioral responses remains unclear. Here, we comprehensively examine the effects of (1) light intensity, (2) timing of light (duration of exposure, circadian time of day), and (3) phototransduction mechanisms processing light information that determine avoidance versus attraction behavior assayed at high spatiotemporal resolution in Drosophila. External opsin-based photoreceptors signal for attraction behavior in response to low-intensity ultraviolet (UV) light. In contrast, the cell-autonomous neuronal photoreceptors, CRYPTOCHROME (CRY) and RHODOPSIN 7 (RH7), signal avoidance responses to high-intensity UV light. In addition to binary attraction versus avoidance behavioral responses to UV light, flies show distinct clock-dependent spatial preference within a light environment coded by different light input channels.

中文翻译：

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集成了多个光电转换输入，以介导果蝇中的紫外线诱发的回避/吸引行为。

短波长光引导了许多行为，这些行为对于昆虫的生存至关重要。在果蝇中，短波长的光既引起吸引，又引起回避行为。尚不清楚光提示如何引起行为反应的两个相反价态。在这里，我们全面检查了以下因素的影响：（1）光强度，（2）光定时（曝光持续时间，昼夜节律时间），以及（3）处理光信息的光转导机制，这些信息决定了在高时空下测定的回避与吸引行为果蝇中的分辨率。外部基于视蛋白的感光体发出信号，表示响应低强度紫外（UV）光的吸引行为。相反，细胞自主神经元感光体CRYPTOCHROME（CRY）和RHODOPSIN 7（RH7），信号回避对高强度紫外线的响应。除了对紫外线的二元吸引与避免行为响应外，果蝇在由不同光输入通道编码的光环境中还表现出不同的时钟依赖性空间偏好。