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Titre :
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Sugar metabolism of winter wheat cultivars stressed by cereal aphids
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Auteurs :
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H. Havlickova ;
J. Moravcova
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Type de document :
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article/chapitre/communication
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Année de publication :
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1998
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Format :
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81-87
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Langues:
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= Anglais
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Mots-clés:
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winter wheat cultivars
;
cereal aphids
;
Metopolophium dirhodum
;
Rhopalosiphum padi
;
Sitobion avenae
;
water soluble carbohydrates
;
Glucide
;
Metabolisme
;
Action sur la plante
;
Saccharose
;
Fructose
;
Glucose
;
Aphididae
;
Triticum aestivum
;
Gramineae
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Résumé :
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The sugar metabolism of five winter wheat cultivars (Hana, Regina, Sparta, Viginta and Zdar) infested by the cereal aphids Metopolophium dirhodium (Wlk.), Rhopalosiphum padi (L.) and Sitobion avenae (F.) was assessed during two vegetative seasons. Plants growing under greenhouse conditions were separately infested by M. dirhodum and R. padi at the end of the booting stage, while infestation of ears by S. avenae was carried out at the beginning of anthesis. In both leaves and ears infested by aphids cultivar and aphid dependent changes in the metabolism of water soluble carbohydrates (WSC) were determined. In infested plant tissues the WSC content positively correlated with the level of cultivar infestation by M. dirhodum and negatively with R. padi densities on leaves and S. avenae numbers in ears. Feeding of M. dirhodum increased the WSC content in the leaves of all cultivars. Cultivar infestation exceeding 265 individuals of R. padi on the leaves per tiller and 100 individuals of S. avenae per ear led to a decrease in WSC content in analysed plant tissues as compared to uninfested ones. Three main sugars, sucrose, glucose and fructose were detected in the leaves and ears of both uninfested and infested plants. The proportion of sucrose in the WSC content of all cultivars was lower and that of glucose higher in infested plant parts as compared to uninfested ones. The proportion of fructose varied. The changes in sugar metabolism of aphid infested wheat plants are discussed in relation to the physiology and biochemistry of plants growing under biotic and abiotic stress conditions.
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Source :
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Rostlinna Vyroba - 0370-663 X, vol. 44, n° 2
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