| habitat selection of three chrysomelid species associated with rumex spp. | habitat selection of three chrysomelid beetles feeding on the rumex plants was studied in relation to the ecological requirements of the three species and the habitat characteristics arising in their unstable and often unpredictable environment. the different ecological requirements and bionomic characteristics of the three chrysomelids were associated not only with their differing degrees of feeding specialization; they also influenced habitat selection. for example, the small body size and low ... | 1985 | 28311588 |
| insect diapause-specific peptide from the leaf beetle has consensus with a putative iridovirus peptide. | diapause and hibernation during periods of environmental adversity are essential features of the life cycle in many organisms, yet the molecular basis for these events differs among animals. we have identified an endogenous diapause/hibernation-specific peptide, from the leaf beetle gastrophysa atrocyanea. this peptide provides antifungal activity, acts as a n-type voltage-gated ca2+ channel blocker, and has a new consensus sequence with an unknown polypeptide encoded in the insect iridescent vi ... | 2003 | 14706547 |
| a chitinase structurally related to the glycoside hydrolase family 48 is indispensable for the hormonally induced diapause termination in a beetle. | two proteins (apap i and ii) of the glycoside hydrolase family 48 (family gh48) were isolated from the active adults of the leaf beetle gastrophysa atrocyanea. full-length and cdnas were sequenced. apap i expression and function were examined in detail. the protein has a chitinase but not a glucanase and cellobiohydrolase activity. it is expressed in the feeding stages, including beetles whose diapause was terminated with a juvenile hormone agonist. suppression of the apap i expression by means ... | 2006 | 16684504 |
| beetles do it differently: two stereodivergent cyclisation modes in iridoid-producing leaf-beetle larvae. | larvae of the chrysomelina species phaedon cochleariae, hydrothassa marginella, phratora vulgatissima, gastrophysa viridula, gastrophysa atrocyanea, gastrophysa cyanea and gastrophysa polygoni produce the iridoid chrysomelidial (1) to defend themselves against predators. feeding experiments with a deuterated precursor ([(2)h(5)]8-hydroxygeraniol 9) and in vitro isotope exchange experiments with defensive secretion in (2)h(2)o revealed differences in the cyclisation of the ultimate precursor 8-ox ... | 2013 | 23341265 |
| expression profiling of a diapause-specific peptide (dsp) of the leaf beetle gastrophysa atrocyanea and silencing of dsp by double-strand rna. | a diapause-specific peptide (dsp) composed of 41 amino acid residues including 6 cysteines, has been isolated from diapausing adults of the leaf beetle gastrophysa atrocyanea. in this study, dsp was found to be expressed primarily in diapausing adults and to a minor extent in pupae, but not in eggs, larvae, or post-diapausing adults. dsp was not induced by bacterial or fungal challenge. dsp-less adults were generated by the injection of double-stranded rna (dsrna) corresponding to the dsp gene i ... | 2005 | 15936770 |
| diet-consumer nitrogen isotope fractionation for prolonged fasting arthropods. | nitrogen acquisition for cellular metabolism during diapause is a primary concern for herbivorous arthropods. analyses of naturally occurring stable isotopes of nitrogen help elucidate the mechanism. relevant articles have cited (58 times up to mid-june 2011) anomalously elevated δ(15)n (per mil deviation of (15)n/(14)n, relative to atmospheric nitrogen=0 ‰) values (diet-consumer nitrogen isotope fractionation; up to 12 ‰) for a prolonged fasting raspberry beetle (byturus tomentosus degeer (cole ... | 2011 | 22166153 |