Criteria for estimation of Fusarium scab resistance in wheat
1994
Ittu, M. | Saulescu, N.N. | Ittu, G. (Research Institute for Cereals and Industrial Crops, Fundulea (Romania))
To appreciate the level of resistance to Fusarium which produces scab in wheat different criteria as: the visual score of Fusarium attack, the weight of heads, the number and the weight of each of the white, shrivelled and white+shrivelled kernel were analysed. Under artificial and natural inoculations 21 winter wheat genotypes with different levels of resistance to this pathogen were investigated. Under artificial inoculation the yield reduction expressed as head weight and kernel weight (percent from nonincluded control) was supplementary calculated. The results indicated that the weight reduction of heads beside the visual score of attack were valuable criteria for estimation of resistance, easy to be applied in the routine screening trials. If more details on the level of resistance are necessary, the utilization of kernel number and kernel weight even more laborious, is recommended. Under natural conditions of Fusarium scab epidemics from 1991, the number and the weight of shrivelled kernels accurately expressed the level of resistance. The regression analyses between the intensity of attack and yield losses allowed the identification of the both resistant and tolerant genotypes. Fundulea 29, Fundulea 549, Fundulea 308 and Fundulea 574 registered low values for yield losses and intensity of attack, while Fundulea 336, Fundulea 132 proved as tolerant with relative low yield losses corresponding to high score of Fusarium attack.
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