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| Effects of UVA radiation on cuticle microstructure of Tribolium castaneum |
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| DOI：10.16768/j.issn.1004-874X.2018.06.014 |
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| Abstract: |
| Ultraviolet A（ UVA） is a very important abiotic environmental factor to organisms. Cuticles are
always the first line of defense to UV radiation. Changes of cuticle morphology and physiology contributing to UV
resistance have been found in many marine organisms，higher plants，and human. But there were few researches
about the cuticle of insects influenced by UVA. In this study，we used SEM and TEM to analyze changes of
ultrastructural structure of larvae of Tribolium castaneum after 2 h and 4 h of UVA exposure. It was found that with the
irradiation time increasing，boundaries of scale corresponding to the underlying epidermal cells on the dorsal surface
of larvae were blurred and more secretions were deposited up to epidermal cells. In addition，the exocuticle became
much thicker，and electron dense outside region of the exocuticle enlarged. However，endocuticle nuclei，Golgi
apparatus and mitochondria were not influenced by UVA. These results might indicate that T. castaneum could change
cuticle properties to reduce UVA damages. |
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