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Auteur H. Niemeyer |
Documents disponibles écrits par cet auteur (23)
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article/chapitre/communication
C. Caillaud ; H. Niemeyer | 1996article/chapitre/communication
A. Givovich ; J. Sandstrom ; H. Niemeyer ; J. Pettersson | 1994Phloem sap of wheat seedlings differing in whole leaf hydroxamic acid (Hx) concentrations was collected by cutting stylets of feeding aphids. DIMBOA-glucoside was the only Hx-related product found. Concentration of DIMBOA-glucoside in phloem sap[...]article/chapitre/communication
A. Givovich ; H. Niemeyer | 1996Wheats and triticales resistant to Russian wheat aphid (RWA), Diuraphis noxia, contained medium to very high concentrations of hydroxamic acids. Feeding behaviour and performance of RWA in wheat seedlings differing in hydroxamic acid (Hx) levels[...]article/chapitre/communication
C. Ramirez ; H. Niemeyer | 1999Extended sieve element salivation (E1 waveform in the electrical penetration graph) is a characteristic activity during early sieve element punctures, particularly in resistant plants. In order to explore a chemically-mediated mechanism of resis[...]article/chapitre/communication
P. Caballero ; C. Ramirez ; H. Niemeyer | 2001The effect of alternative host condition on the pattern of specialisation of the aphid Rhopalosiphum maidis (Fitch) was studied. R. maidis commonly occurs in Chile on Johnson grass (Sorghum halepense L.) but rarely on contiguous wheat (Triticum [...]article/chapitre/communication
C. Ramirez ; H. Niemeyer | 2000It was hypothesized that (I) previous experience of aphids on a host plant leads to differences in their feeding behavior relative to aphids without previous experience on it and that (2) a change in the physiological state of the aphid modifies[...]article/chapitre/communication
V. Argandona ; L. Corcuera ; H. Niemeyer ; B. Campbell | 1983article/chapitre/communication
E. Gianoli ; C. Caillaud ; B. Chaubet ; J. Di Pietro ; H. Niemeyer | 1997Aphid genotype has been shown to be a source of variability in the induction of phytochemical responses in wheat after aphid infestation as well as in their performance on wheat lines. Two clones of the aphid Sitobion avenae (F.) that differed m[...]