Abstract: Resis tance mechanism of 10 wheat variet ies were observed and analysed. The results indicated that there were larger dif ferences in resis tance of wheat characters to wheat midge.Resis tant varieties were related to height of plant, ear length, spikelet densi ty, flag leaf length and width, stem waxnature, grain husk fine hair, hardness, thickness. On the basis of field insect plot appraisal, the biochemical mechanisms of 8 wheat varieties/ l ines resistant to wheat midge(sitodiplosis mose llana Gehin) were studied by chmical analysis methods to e xplore the possible factors contribut ing to wheat midge resistance. Total phenolics, tannins and soluble sugar were the main factors of wheat resistance to wheat midge and thei r rather s trong ef fects appeared at early milky stage. Total phenols was the more important fac tor of these three. Total phenolics and tannins were the substanes of wheat induced resis tance to wheat midge, whi le soluble sugar had no relation to induced resistance.

Key words: Wheat varieties, Sitodiplosis mosel lana Gehin, Resistance mechanism

CLC Number: 

• S435.122