Red-green opponency in the long visual fibre photoreceptors of brushfoot butterflies (Nymphalidae).

Red-green opponency in the long visual fibre photoreceptors of brushfoot butterflies (Nymphalidae).
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在长长的视觉纤维光感受器(若虫科)的长视觉纤维感光体中,红绿色的对立。

DOI:
10.1098/rspb.2021.1560
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发表时间:
2021-10-27
期刊:
Proceedings. Biological sciences
影响因子:
--
通讯作者:
Pirih P
Pirih P
中科院分区:
其他
文献类型:
--
作者:
Belušič G;Ilić M;Meglič A;Pirih P

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在许多蝴蝶中,祖先的三色昆虫视觉,基于对紫外线、蓝色和绿色敏感的光感受器,扩展了对红色敏感的细胞。尽管一些种类的蛱蝶可以很好地辨别红色,但关于红色受体的生理证据在蛱蝶中一直缺失。在Archaeoprepona属、Argynnis属、Charaxes属、Danaus属、Melitaea属、Morpho属、Heliconius属和Speyeria属的8个物种中,我们发现了一类新的绿色敏感光感受器,它们对红光刺激具有超极化反应。这些绿色阳性,红色阴性(G+R -)细胞被分配到R1/2位置,通常由紫外线和蓝色敏感细胞占据。光谱灵敏度、极化灵敏度和时间动力学表明,红色对手单位(R -)是基底光感受器R9,通过直接抑制突触与同一小眼中的R1/2相互作用。我们发现G+R -细胞只存在于含有纵向筛选色素的红色小眼中。R9的红色通道的实现与蝴蝶和凤蝶不同,其中细胞R5-8是红色受体。雌雄虫的红绿对手通道和四色视的潜力似乎在进化过程中被打开了几次,在神经处理的成本和扩展颜色信息的价值之间取得平衡。
In many butterflies, the ancestral trichromatic insect colour vision, based on UV-, blue- and green-sensitive photoreceptors, is extended with red-sensitive cells. Physiological evidence for red receptors has been missing in nymphalid butterflies, although some species can discriminate red hues well. In eight species from genera Archaeoprepona, Argynnis, Charaxes, Danaus, Melitaea, Morpho, Heliconius and Speyeria, we found a novel class of green-sensitive photoreceptors that have hyperpolarizing responses to stimulation with red light. These green-positive, red-negative (G+R–) cells are allocated to positions R1/2, normally occupied by UV and blue-sensitive cells. Spectral sensitivity, polarization sensitivity and temporal dynamics suggest that the red opponent units (R–) are the basal photoreceptors R9, interacting with R1/2 in the same ommatidia via direct inhibitory synapses. We found the G+R– cells exclusively in butterflies with red-shining ommatidia, which contain longitudinal screening pigments. The implementation of the red colour channel with R9 is different from pierid and papilionid butterflies, where cells R5–8 are the red receptors. The nymphalid red-green opponent channel and the potential for tetrachromacy seem to have been switched on several times during evolution, balancing between the cost of neural processing and the value of extended colour information.
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