Differences in aphid infestation of winter wheat cultivars in relationship to biochemical characteristics
1996
Havlickova, H. (Vyzkumny Ustav Rostlinne Vyroby, Prague-Ruzyne (Czech Republic))
Five winter wheat cultivars were tested in glasshouse conditions for suitability to cereal aphids Metopolophium dirhodum, Rhopalosiphum padi and Sitobion avenae in relationship to biochemical characteristics of plants. Suitability of cultivars for aphids was evaluated by aphid dry matter per tiller/spike 14 days after artifical infestation. The content of dry matter, free amino acids and sugars in leaves and spikes were determined in the control plants parallelly with infestation. Dry matter and basic metabolite contents in leaves of cultivar was in statistically significant positive correlation with reproduction of R. padi and in negative correlation with reproduction of M. dirhodum on plants. Relationship between biochemical characteristics of cultivars' spikes and reproduction of S. avenae was not confirmed. Based on differences in reproduction of aphids, a certain level of antibiosis of the Regina cultivar to aphids was associated with the low content of dry matter and metabolites, above all amino acids in leaves and antibiosis in the Hana cultivar to M. dirhodum was connected with low level of water in leaves. The Sparta cultivar of a little development precocity, highest dry matter content, free amino acids and sugars in leaves was the best host for R. padi and less suitable for M. dirhodum.
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