ACTION SPECTRA AND CHROMATIC MECHANISMS OF CELLS IN MEDIAN OCELLI OF DRAGONFLIES
ACTION SPECTRA AND CHROMATIC MECHANISMS OF CELLS IN MEDIAN OCELLI OF DRAGONFLIES
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DOI：
10.1085/jgp.65.4.399
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发表时间：
1975-01-01
影响因子：
3.8
通讯作者：
DEVOE, RD
中科院分区：
文献类型：
--
作者：
CHAPPELL, RL;DEVOE, RD
光谱敏感性记录在细胞内的正中单眼的Anax junius，Aeschna tuberculifera，和Libellululfenchella。所有细胞在360和500 nm处都有峰值灵敏度，而仅在Anax中发现的UV蓝/绿细胞在440 nm处有第三个峰值灵敏度。在每个单眼中，细胞与细胞之间的UV与绿色敏感性的比率不同，但没有记录到仅UV或仅绿色的细胞。一半的测试细胞有一个反向浦肯野位移：他们更敏感的绿色在低照度，但更敏感的紫外线在高照度;他们的强度响应曲线在370和520 nm交叉，但成为平行的大响应。波长420 nm和更短的引发了一个家庭的低强度响应曲线与一个斜率;波长440 nm和更长的引发了一个家庭的曲线与另一个斜率。橙色适应光选择性地适应绿色的敏感性，而紫外适应光的选择性影响不大。对数选择性适应的量与对数橙色适应强度成正比。它的结论是，两个光谱机制，可以记录从每个细胞，可能是通过耦合的UV和绿色细胞或可能是因为每个细胞包含两个视色素。选择性的色彩适应可能为单眼提供了一种“自动色彩控制”，而反向浦肯野位移可能会延长单眼对当时天空的敏感性。
Spectral sensitivities were recorded intracellularly in median ocelli of Anax junius, Aeschna tuberculifera, and Libellulapulchella. All cells had peak sensitivities at 360 and 500 nm while UV-blueWgreen cells found only in Anax had a third peak sensitivity at 440 nm. Ratios of UV-to-green sensitivities varied from cell to cell in each ocellus, but no UV-only or green-only cells were recorded. Half of the cells tested had a reverse Purkinje shift: They were more sensitive in the green at low illuminations but more sensitive in the UV at high illuminations; their intensity-response curves at 370 and 520 nm crossed but became parallel for large responses. Wave-lengths 420 nm and shorter elicited a family of low intensity-response curves with one slope; wavelengths 440 nm and longer elicited a family of curves with another slope. Orange-adapting lights selectively adapted sensitivity in the green, but UV-adapting lights had little selective effect. Amounts of log-selective adaptation were proportional to log orange-adapting intensity. It is concluded that two spectral mechanisms can be recorded from each cell, possibly by coupling of UV and green cells or possibly because each cell contains two visual pigments. Selective chromatic adaptations may provide the ocellus with a kind of" automatic color control," while the reverse Purkinje shift could extend the ocellus' sensitivity to prevailing skylight.