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Vol. 47 No. 1, 2008
Physiological and Endocrine Differences between Diapausing and Nondiapausing Larvae of the Pine Caterpillar Dendrolimus tabulaeformis (Lepidoptera: Lasiocampidae)
Rui-Dong Han1,2, Ya-Ling Gan1, Xue-Hua Kong2, and Feng Ge1,*
1State
Key Laboratory of Integrated Management of Pest Insects and Rodents,
Institute of Zoology, Chinese Academy of Science, Haidian, Beijing
100080, China
2Institute of Plant-Protection, Weifang Sci-Tech Vocational College, Shouguang, Shandong Province 262700, China
Rui-Dong Han, Ya-Ling Gan, Xue-Hua Kong, and Feng Ge (2009) We investigated chemical and morphological differences between diapausing and non-diapausing larvae of the pine caterpillar, Dendrolimus tabulaeformis
(Lepidoptera: Lasiocampidae). Chemical analyses showed that both
the lipid content in the whole body and the concentration of trehalose
significantly differed between diapausing and non-diapausing
larvae. The lipid, protein, and amino acid contents of the
hemolymph of diapausing larvae were higher than those of non-diapausing
larvae. The content of free fatty acids of non-diapausing larvae was 4
times higher than that of diapausing larvae. Moreover, diapausing
larvae showed lower oxygen consumption than non-diapausing
larvae. Differences in the anatomy of incretions according to the
physiological condition (diapausing or non-diapausing) were evident,
and included the number of cells in the corpora allata, the volume of
the nucleus, and the internal structure of the cytoplasm. The
prothoracic glands also differed between diapausing and non-diapausing
larvae. These results suggest that the pine caterpillars
hormonally regulate their body composition to adapt to their
surroundings.
Key words: Dendrolimus tabulaeformis, Diapausing, Non-diapausing, Corpora allata, Prothoracic glands.
*Correspondence: Tel :86-10-64807130. Fax: 86-10-64807099. E-mail:gef@ioz.ac.cn
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