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Polymorphism of red receptors: sensitivity spectra of proximal photoreceptors in the small white butterfly Pieris rapae crucivora

Xudong Qiu and Kentaro Arikawa^*

Graduate School of Integrated Science, Yokohama City University, Yokohama, Japan

View larger version (19K): [in a new window]   Fig. 1. Diagram of the Pieris rapae crucivora ommatidium. Distal photoreceptors (R1–4) bear photoreceptive microvilli in the distal two-thirds of the rhabdom. Proximal photoreceptors (R5–8) contribute their microvilli to the proximal one-third of the rhabdom. R9 adds a few microvilli at the base of the rhabdom. Pigment granules in R5–8 are seen as four spots in transverse sections, and their arrangement is a reliable marker for identifying the ommatidial type (see, for example, Fig. 2C). T, tapetum.

View larger version (47K): [in a new window]   Fig. 2. An example of a LW620 receptor in a type I ommatidium. (A) Sensitivity spectrum. (B) Green-induced fluorescence picture of a transverse section containing the Alexafluor 568-injected receptor shown in A (arrowhead). The receptor is an R8. (C) Same section taken under regular transmission light, indicating that the Alexafluor 568-injected receptor is a member of a type I ommatidium with pigment arranged trapezoidally (arrowhead). Scale bar, 10 µm.

View larger version (43K): [in a new window]   Fig. 3. An example of a LW620 receptor in a type III ommatidium. (A) Sensitivity spectrum. (B) Green-induced fluorescence picture of a transverse section containing the Alexafluor 568-injected receptor shown in A (arrowhead). The receptor is an R6. (C) Same section taken under regular transmission light, indicating that the Alexafluor 568-injected receptor is a member of a type III ommatidium with pigment arranged rectangularly (arrowhead). Scale bar, 10 µm.

View larger version (58K): [in a new window]   Fig. 4. An example of a LW640 receptor in a type II ommatidium. (A) Sensitivity spectrum. (B) Green-induced fluorescence picture of a transverse section containing the Alexafluor 568-injected receptor shown in A (arrowhead). The receptor is an R8. (C) Same section taken under regular transmission light, indicating that the Alexafluor 568-injected receptor is a member of a type II ommatidium with pigment arranged in a square (arrowhead). Scale bar, 10 µm.

View larger version (17K): [in a new window]   Fig. 5. Sensitivity spectra of the two different classes of red receptor, LW620 and LW640, identified in the proximal tier of the ommatidia of Pieris rapae crucivora. Values are means ± S.E.M., N=number of cells analyzed in the present study.