| viridaphin a(1) glucoside, a green pigment possessing cytotoxic and antibacterial activity from the aphid megoura crassicauda. | a green pigment, viridaphin a(1) glucoside (1), was isolated from the green aphid megoura crassicauda. one- and two-dimensional nmr spectrometric analyses of 1 and its aglycone established the structure as an octacyclic compound. viridaphin a(1) glucoside exhibited cytotoxicity against hl-60 human tumor cells with an ic(50) of 23 ++m and antibacterial activity against bacillus subtilis nbrc 3134 with a minimum inhibitory concentration of 10.0 ++g/ml. these results suggested that aphid pigments m ... | 2011 | 21830784 |
| interspecific symbiont transfection confers a novel ecological trait to the recipient insect. | in japan, pea aphids acyrthosiphon pisum mainly feed on vetch and clover, and many aphid clones produce more progeny on vetch than on clover. in this context, particular genotypes of the facultative symbiont regiella insecticola enhance reproduction of infected pea aphids specifically on clover, thereby broadening the suitable food plant range of the insect. a species that is sympatric to a. pisum, vetch aphids megoura crassicauda, are commonly found on vetch but not on clover. laboratory rearin ... | 2010 | 20880856 |
| a hemiterpene glucoside as a probing deterrent of the bean aphid, megoura crassicauda, from a non-host vetch, vicia hirsuta. | the bean aphid, megoura crassicauda mordvilko, feeds selectively on plants belonging to the genus vicia (fabaceae). however, it never infests the tiny vetch, v. hirsuta (l.) gray. the aphid appeared to discriminate between host and non-host plants by tasting specific chemicals during penetration of its stylet into the plant tissues. the aphid, after being stimulated by specific probing stimulants, deposited characteristic proteinous stylet sheaths through a parafilm membrane, which has one side ... | 2006 | 16434070 |
| juvenile hormone titer and wing-morph differentiation in the vetch aphid megoura crassicauda. | most aphids exhibit wing polyphenism, in which winged and wingless females are produced depending on aphid densities. although juvenile hormone (jh) has been implicated in the regulation of aphid wing polyphenism, relatively few studies examining the direct relationship between jh titer and resultant wing morphs have been undertaken. we therefore investigated the relationship between jh iii titer and the development of wing morphs in the vetch aphid megoura crassicauda during postembryonic devel ... | 2013 | 23434762 |
| acylated flavonol glycosides as probing stimulants of a bean aphid, megoura crassicauda, from vicia angustifolia. | a bean aphid, megoura crassicauda, which feeds selectively on the plant genus vicia (fabaceae), was found to be stimulated to probe an extract solution of the host plant, narrowleaf vetch, vicia angustifolia l., depositing characteristic stylet sheaths on a parafilm membrane. two acylated flavonol glycosides were isolated as the specific probing stimulants from the extracts and characterized as quercetin 3-o-alpha-l-arabinopyranosyl-(1-->6)-[2"-o-(e)-p-coumaroyl]-beta-d-glucopyranoside and querc ... | 2002 | 12169306 |
| screening of upregulated genes induced by high density in the vetch aphid megoura crassicauda. | aphids exhibit several polyphenisms in which discontinuous, alternative phenotypes are produced depending on environmental conditions. one representative example is the wing polyphenism, where winged and wingless females are produced through parthenogenesis. previous work has shown that, in some aphid species, the density condition sensed by the mother aphid determines the developmental fate of embryos in her ovary, with high densities leading to winged progeny and low densities to wingless prog ... | 2012 | 22514053 |
| differential regulations of wing and ovarian development and heterochronic changes of embryogenesis between morphs in wing polyphenism of the vetch aphid. | in wing polyphenisms that produced alternative wing morphs depending on environmental conditions, the developmental regulations to balance between flight and reproductive abilities should be important. many species of aphids exhibit wing polyphenisms, and the development of wing and flight muscles is thought to incur costs of reproductive ability. to evaluate the relationship between flight and reproduction, the fecundity and the wing- and ovarian development in the parthenogenetic generations w ... | 2015 | 19878289 |