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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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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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V. Argandona ; H. Niemeyer ; L. Corcuera | 1981
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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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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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S. Wratten, - Editeur scientifique ; D. Thackray, - Editeur scientifique ; P. Edwards, - Editeur scientifique ; H. Niemeyer, - Editeur scientifique | 1987
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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 ; F. Perez ; H. Niemeyer, - Editeur scientifique ; F. Perez, - Editeur scientifique | 1985
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C. Johansson ; J. Pettersson ; H. Niemeyer | 1997In olfactometric experiments a wingless adult of Sitobion avenae was attracted by odours of a wingless adult of Rhopalosiphum padi feeding on a wheat plant. When the stimulus consisted of either a wingless R. padi without plant material or a whe[...]
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E. Giamoli ; H. Niemeyer | 1997
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C. Figueroa ; J. Simon ; J. Legallic ; H. Niemeyer | 1999A set of molecular markers to differentiate the aphid (Hemiptera: Aphidoidea) species Sitobion avenae (Fabricius) from Sitobion fragariae (Walker), is presented. These markers correspond to (1) a region of the mitochondrial DNA, (2) five species[...]
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J. Pettersson ; A. Quiroz ; D. Stephansson ; H. Niemeyer | 1995
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C. Ramirez ; N. Olea ; H. Niemeyer | 1999The pattern of cell punctures in the electrical penetration graph was studied from the start of a probe leading to the first phloem phase by the aphid Sitobion fragarine (Walker) (Sternorrhyncha: Aphididae) on two cultivars of the wheat, Triticu[...]
