Influence of temperature on common wheat – Fusarium culmorum (W.G. Smith) saccardo interactions [Articol]

Abstract

The paper presents data on the reaction of common wheat genotypes to Fusarium culmorum isolates. By treating the grains with culture filtrates, under controlled conditions, it was found that low temperature contributes to increasing the virulence of F. culmorum isolates and to changing the factorial weight of phytopathosystem components in the source of variation in growth organs. The lowest values of the heritability coefficient (h2) were recorded in the case of the embryonic radicle length for both thermal variants under study (I – control: 18-19°C, II – 18-19 / 8-9 / 18-19°C). In contrast to the radicle, the stem recorded much higher h2 values at both temperatures, which is evidence of its more pronounced genetic determinism and the weaker influence of fungal culture filtrates and temperature. The vigor index recorded relatively high values of heritability coefficient (0.65-0.70) and genetic progress (21.8-27.6%) for both thermal conditions, which denotes additive control of growth and development characters and, at the same time, opportunities to create wheat genotypes resistant to F. culmorum in short terms.