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Monosomic analysis of partial resistance and tolerance of wheat to septoria nodorum

Monosomic analysis of partial resistance and tolerance of wheat to septoria nodorum

Agronomie 8(9): 801-810

A complete series of F2 monosomic wheat was inoculated at boot and heading stages with two strains of Septoria nodorum Berk. (=Leptosphaeria nodorum Muller). Strain n.degree.6 was isolated from wheat cv. "Etoile de Choisy", and strain n.degree.42 from triticale cv. "Clercal". The strains had different levels of aggressiveness. The F2 monosomics were compared with the F2 disomic for reaction to the two strains, plant by plant, for the following characters: two elements of partial resistance (incubation time or L.P.I., rate of lesion extension or P. max); two elements of tolerance (disease intensity on the heads or I.E., thousand-kernel weight of diseased plants or P.M.G.M.). Table 1 and figure 1 show the results obtained with the two strains. For L.P.I., the two strains gave the same results on F2 2A, 7A, 1B, 2B, 4B, 1D, 2D, 3D; only 7A and 2B gave a resistant reaction. The F2 4A, 5B, 7B gave opposite results between the strains. With P, max, the same result for the resistance was given only with 3A, and opposite results with the F2 2B, 3B, 5B. For I.E. the resistance or susceptibility reactions were different with the strains. No concordance was found between characters of partial resistance and characters of tolerance, which were thus two different genetic systems. The relation between L.P.I. and P, max was only partial with strain 42. Statistical analysis showed interaction between F2 monosomic and strains for L.P.I. (table 2), for P, max (table 3), for I.E. (table 4) and for P.M.G.M. (tables 5 and 7). All three genomes of wheat were implicated but F2 5A, 1B, 4B, 5B, 7B did not participate in these interactions (table 6). These results on variation in the chromosomes implicated in partial resistance in relation to the origin of the pathogen are discussed in regard to the specificity of the relation in the case of aggressiveness. There may be a risk of appearance of specialized strains adapted to the level of partial resistance in the host. A breeding program for resistance to glume blotch should associate partial resistance of the leaves and tolerance of the head.

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