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Figure 7


Fig. 7. Tissue structure of A. gracilis before and after exposure to 1500 J m-2 of UV-B. (A) Cross-section of A. gracilis without UV-B exposure, clearly showing the cuticle (C) and epidermis (E). (B) Section of A. gracilis immediately after exposure to UV-B. The cuticle swelled and the epidermis necrosed. (C) After 2 h exposure, the cuticle shows breakdown, and the epidermis, circular muscle (CM) and longitudinal muscle (L) show necrosis. (D) After 18 h exposure, the epidermis and circular muscle are destroyed and only the longitudinal muscle is present. Scale bar, 50 µm.