Identification of Cercospora leaf spot (Cercospora traversiana) resistance among fenugreek accessions and morphological characterization of the pathogen.

Prasad, R., Acharya, S.N., Erickson, R.S., and Thomas, J.E. (2014). "Identification of Cercospora leaf spot (Cercospora traversiana) resistance among fenugreek accessions and morphological characterization of the pathogen.", Australian Journal of Crop Science, 8(6), pp. 822-830.

Abstract

Cercospora leaf spot is a destructive and widespread disease of fenugreek (Trigonella foenum-graecum L.). To identify resistant germplasms and to morphologically characterize the disease pathogen on fenugreek plants, 48 accessions adapted to western Canada were screened by artificially inoculating plants with 1×104 spores ml-1 conidial suspensions of C. traversiana in growth cabinets. Out of these, nine accessions were characterized as resistant (R) or moderately resistant (MR) and the rest were susceptible. A more detailed study with 20 selected (9 resistant and 11 other) accessions using the artificial inoculation method revealed that the accessions were significantly (p ≤ 0.01) different in their reaction to the disease. In the later test only two (L3717 and PI138687) had R and two (L3698 and F86) had MR ratings. An ANOVA for the agronomic traits measured indicated that the interaction effect of accession and treatment (with or without inoculation) was significant and the R or MR rated accessions were less affected by inoculation than the rest. The western Canada adapted accessions recovered from the fungal inoculation and produced a reasonable seed and biomass yield. Although further studies are warranted to verify the findings, the disease symptoms described, the disease effect on agronomic traits observed, and morphology of the pathogen may serve as a reference for future studies involving plant reaction to C. traversiana.

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