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Natural Variation in Maize Aphid Resistance Is Associated with 2,4-Dihydroxy-7-Methoxy-1,4-Benzoxazin-3-One Glucoside Methyltransferase Activity[C][W]
A natural transposon insertion appears to mediate an ecologically relevant trade-off between the direct toxicity and defense-inducing properties of maize benzoxazinoids.
Dual Chemical Barriers Protect a Plant Against Different Larval Stages of an Insect
Feeding bioassays with different larval stages of the insect were used to monitor the isolation and identification of two bioactive constituents that could explain the natural resistance of this plant.
Seasonal and Population Variation in Flavonoid and Alliarinoside Content of Alliaria petiolata
Variation in the chemistry of the plant may account for observed variation in development rates and survival of the larvae and several apigenin compounds were isolated and identified by spectral studies.
Isothiocyanates Stimulating Oviposition by the Diamondback Moth, Plutella xylostella
Recognition of cabbage as a host plant for the diamondback moth (DBM) has previously been shown to depend on compounds that are extracted by soaking intact foliage in chloroform. Analysis of such
Sequestration of aristolochic acids by the pipevine swallowtail, Battus philenor (L.): evidence and ecological implications
This study confirmed that populations of B. philenor from Virginia and east Texas sequester aristolochic acids from its Aristolochia food plants, helping explain the abundant ecological data indicating that both immature and adult B. Philenor are unpalatable and protected from natural enemies.
Contact chemoreception related to host selection and oviposition behaviour in the monarch butterfly, Danaus plexippus
Electrophysiological study was conducted to identify the contact chemoreceptors that are sensitive to the known oviposition stimuli and are therefore probably involved in host recognition.
Chemistry of preen gland secretions of passerines: different pathways to same goal? why?
It is suggested that the evolution in variation of preen gland secretion is probably due to selective pressures caused by ectosymbionts such as feather-mites and feather-chewing lice that live on feathers and probably feed on the secretions and surrounding environments.
A cyanoallyl glucoside from Alliaria petiolata, as a feeding deterrent for larvae of Pieris napi oleracea.
Feeding inhibition assays showed comparable activity for the synthetic and natural glycosides, and structural assignment was confirmed by synthesis of peracetylated alliarinoside and its 2E isomer.
Identification and Distribution of Oviposition Stimulants for Monarch Butterflies in Hosts and Nonhosts
A geographical pattern of flavonol distribution that may have affected the evolution of host recognition by the butterflies is suggested.