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Science 22 February 2008:
Vol. 319. no. 5866, p. 1061
DOI: 10.1126/science.1149786
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Brevia

Juvenile Hormone Regulates Butterfly Larval Pattern Switches

Ryo Futahashi1,2 and Haruhiko Fujiwara1*

Insect color patterns can be very diverse. This variation is also seen among many larval instar stages, which can take on vastly different phenotypes. Young caterpillars of the swallowtail butterfly, Papilio xuthus, are mimics of bird droppings, whereas the fifth larval instar is camouflaged among the leaves of host plants (cryptic pattern). We find that juvenile hormone (JH) titers decrease during the fourth larval instar. Furthermore, treatment with JH analog at the beginning of the fourth instar stage resulted in reproducing the mimetic pattern instead of the usual cryptic one and likewise altered gene expression patterns to that associated with the mimetic pattern. These findings suggest that JH regulates the progressive larval pattern switch of this insect.

1 Department of Integrated Biosciences, Graduate School of Frontier Sciences, University of Tokyo, Bioscience Building 501, Kashiwa, Chiba 277-8562, Japan.
2 National Institute of Agrobiological Sciences, 1-2 Owashi, Tsukuba, Ibaraki 305-8634, Japan.

* To whom correspondence should be addressed. E-mail: haruh{at}k.u-tokyo.ac.jp

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
yellow and ebony Are the Responsible Genes for the Larval Color Mutants of the Silkworm Bombyx mori.
R. Futahashi, J. Sato, Y. Meng, S. Okamoto, T. Daimon, K. Yamamoto, Y. Suetsugu, J. Narukawa, H. Takahashi, Y. Banno, et al. (2008)
Genetics 180, 1995-2005
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Science. ISSN 0036-8075 (print), 1095-9203 (online)