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12 recherche sur le mot-clé
'hydroxamic acids' 
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A. Givovich ; H. Niemeyer | 1995Feeding behaviour of five species of cereal aphids in wheat seedlings differing in hydroxamic acid (Hx) levels, was monitored via electrical penetration graphs (EPG). Aphid species could be grouped as sensitive to the feeding deterrent effect of[...]
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A. Givovich ; H. Niemeyer | 1994The feeding behaviour of five cereal aphid species in wheat seedlings (measured by the time taken by an aphid to penetrate the phloem and the time spent in committed pholem ingestion) and their performance (measured as mean relative growth rates[...]
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C. Ramirez ; P. Caballero ; H. Niemeyer | 1999We hypothesized that aphids after previous exposure to hydroxamic acids (Hx), a family of secondary plant compounds deleterious to aphids, are able to reduce their subsequent exposure to them. This hypothesis was tested by evaluating the time to[...]
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E. Gianoli ; H. Niemeyer | 1997The effects of temperature and photoperiod on accumulation of hydroxamic acids (Hx) in wheat (Triticum aestivum L.) seedlings were evaluated under laboratory conditions. Hx concentrations were significantly higher at higher temperatures. No such[...]
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H. Niemeyer ; J. Jerez | 1997Hydroxamic acids are defensive secondary metabolites in wheat, the most abundant aglucones being DIMBOA and DIBOA, The location of genes coding for the accumulation of hydroxamic acids by wheat (Triticum aestivum L.) seedlings was explored compa[...]
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R. Loayzamuro ; C. Figueroa ; H. Niemeyer | 2000Hydroxamic acids (Hx) are wheat secondary metabolites conferring resistance for cereals against aphids. The activity of five enzymatic systems were evaluated in the aphid Sitobion avenae reared on the high-Hx wheat cultivar Chagual and the low-H[...]
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A. Mayoral ; W. Tjallingii ; P. Castanera | 1996The feeding behaviour of Diuraphis noxia (Kurdjumov) (Homoptera: Aphididae) was electronically monitored on five cereal species (Triticum aestivum L., T. turgidum L., Secale cereale L. and x Triticosecale Wittmack) containing different hydroxami[...]
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D. Nicol ; S. Wratten | 1997From a previous worldwide screen of wheat cultivars as seedlings, five were selected to encompass a wide concentration range of the hydroxamic acid DIMBOA (0.99-8.07 mmol kg(-1) fr. wt). Compared with those in seedlings, the concentrations of DI[...]
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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[...]
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B. Leszczynski ; L. Wright ; T. Bakowski | 1989
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C. Caillaud ; H. Niemeyer | 1996
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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[...]
