Sensitivity of Wheat Genotypes to a Toxic Fraction Produced by Cephalosporium gramineum and Correlation with Disease Susceptibility.

摘要: ABSTRACT Cephalosporium stripe is an important disease of winter wheat (Triticum aestivum) in several areas the world, especially where stubble mulch and early seeding are practiced to maintain soil moisture prevent erosion. We developed a procedure mass-produce toxic fraction produced by gramineum through modification method Kobayashi Ui. Exposure excised leaves concentration 60 mul/ml for 72 h distinct wilting symptoms that allowed us distinguish toxin-sensitive genotypes repeatable manner. Twenty belonging four germ plasm groups (common, club, durum, synthetic) were evaluated. Variation toxin sensitivity was mostly at level group, all differences among highly significant (P < 0.001) based on linear contrasts. Seventeen representing common, durum planted C. gramineum-infested fields two locations. The logarithm percentage tillers showing whitehead each locations significantly 0.0001) correlated with measured assay (r = 0.80 0.84). common sensitive fraction, but showed substantial range reactions field. However, we found no case toxin-insensitive genotype being susceptible These results suggest insensitivity may be mechanism resistance stripe, other mechanisms operative as well. useful initial screening reduce number tested