It has long been disputed whether and belong to the same genus, with regarded as a red form of . However, it is unclear why and have different body colors. Since carotenoids are responsible for the color of many organisms, the carotenoid profiles of and were compared by HPLC. There was no difference in carotenoid type, but contained significantly more neoxanthin, astaxanthin, α-carotene, β-carotene, and γ-carotene, which may contribute to the deep red color. The transcriptome sequencing of both species identified 4079 differentially expressed genes (DEGs), of which 12 were related to carotenoid metabolism. RNA interference (RNAi) experiments demonstrated that silencing seven of these DEGs resulted in the different accumulation of carotenoid compounds in and . In addition, the body of turned yellow after two days of feeding with double-stranded RNAs and small interfering RNAs. In conclusion, differences in the carotenoid profiles of and may be responsible for the different body colors.
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| http://dx.doi.org/10.3390/insects14100823 | DOI Listing |
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