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Insect Cytokine Growth-Blocking Peptide May Regulate Density-Dependent Phase Trait Of Cuticular Melanization In The Larval Armyworm, Mythimna Separata

文献类型： 外文期刊

作者： Zhang, YC; He, J; Zhang, YX; Li, Y; Yu, Y; Jiang, XF; Pan, WD

作者机构：

关键词： Growth Blocking Peptide; Density-Dependent; Cuticular Melanization; Dopa Decarboxylase; Mythimna Separata

期刊名称： JOURNAL OF ASIA-PACIFIC ENTOMOLOGY

ISSN： 1226-8615

年卷期： 2020 年 23 卷 2 期

页码：

收录情况： JCR（2021版）

摘要： Growth-blocking peptide (GBP) is a 25 amino acid insect cytokine found in lepidopteran insects that has diverse biological activities such as larval growth regulation, paralysis induction, cell proliferation and stimulation of immune cells. Density-dependent phase polyphenism is a phenomenon of phenotypic plasticity in which the expression of a variety of traits can be affected by local population density. In the present study, the armyworm Mythimna separata larvae with four rearing densities (1 larva/vial, 2 larvae/vial, 4 larvae/vial and 6 larvae/vial) were tested for cuticular melanization and body weight throughout the third-fifth instar, and the functional role of GBP in regulating the changes was investigated. The results indicated that when reared at high densities, the larvae exhibited less body weight and more degree of cuticular melanization than larvae reared at low densities. The gene expression of GBP in armyworm larvae showed an initial rise and then decline trend with increased rearing densities in the third to fifth instar. Compared with control, more degree of cuticular melanization was observed in GBP-injected larvae (500 ng/larva in volume 50 mu L) than that in Ringer's solution-injected counterparts. Furthermore, the gene expression level of dopa decarboxylase and prophenoloxidase increased significantly in GBP-injected fifth instar larvae from 6 h to 12 h after injection, suggesting the role of GBP in modulating density-dependent phase trait of armyworm cuticular melanization.

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