Tolerance to Fusarium Head Blight elicited by phytohormones in wheat

MALBRÁN I.; CASTRO AM; YANNICCARI M; LORI G.; SALDUA VL; GIMÉNEZ DO

Annual Wheat Newsletter

Kansas State University

Lugar: Kansas; Año: 2018 vol. 64 p. 13 - 20

The Fusarium head blight (FHB) is a very important wheat disease caused by Fusarium graminerarum with remarkable economical damages in Argentina. Since there are only few resistance sources of resistance, several year ago we tested Synthetic 6X as a donor for FHB resistance. Several doble haploid lines showed induced resistance against FHB after phytohormones treatment. Two novel lines (L and M) and a comercial cultivar (ACA 315) have been tested in two different localities (La Plata and Tres Arroyos) during three years. A Split-plot design was used in order to compare the responses to the following hormones treatments: Salicilic acid (SA), Jasmonic acid (JA), Giberellic acid (GA), a solution with a strain of Pseudomonas fluorescens (Pf) or water (control), these were sprayed at anthesis. Twenty four hours later half of the plots of each pre-treatment of every genotype were inoculated. Spikes were harvested manually and the number of total grains (TG), damaged kernel (DK) and 1000- kernel weight (TKW) were recorded. The pre-treatment with Giberelic acid increased the TG in the lines L, M and ACA315 with and without inoculación with Fg compared to the controls and the rest of the treatments. JA induced a lower DK in the lines L and M. The commercial variety did not show differences between treatments. The treatment with PF induced the highest levels of tolerance in both experimental lines with the lower values of DK and with higher TKW. These results were similar in both localities in the last two years. The elicitation of SAR in the experimental lines increased the tolerance to FEB.