21601644
not annotated - annotated - LINNAEUS only
Analysis of the Fusarium graminearum species complex from wheat, barley and maize in South Africa provides evidence of species-specific differences in host preference.
Species identity and trichothecene toxin potential of 560 members of the Fusarium graminearum species complex (FGSC) collected from diseased wheat, barley and maize in South Africa was determined using a microsphere-based multilocus genotyping assay. Although three trichothecene types (3-ADON, 15-ADON and NIV) were represented among these isolates, strains with the 15-ADON type predominated on all three hosts. A significant difference, however, was identified in the composition of FGSC pathogens associated with Gibberella ear rot (GER) of maize as compared to Fusarium head blight (FHB) of wheat or barley (P<0.001). F. graminearum accounted for more than 85% of the FGSC isolates associated with FHB of wheat and barley (N=425), and was also the dominant species among isolates from maize roots (N=35). However, with the exception of a single isolate identified as an interspecific hybrid between Fusariumboothii and F. graminearum, GER of maize (N=100) was exclusively associated with F. boothii. The predominance of F. graminearum among FHB isolates, and the near exclusivity of F. boothii among GER isolates, was observed across all cultivars, collection dates, and provinces sampled. Because these results suggest a difference in host preference among species of the FGSC, we hypothesize that F. graminearum may be less well adapted to infect maize ears than other members of the FGSC.
Ann file
T1 Species 16 36 Fusarium graminearum
N1 Reference T1 Taxonomy:5518
T2 Species 58 63 wheat
N2 Reference T2 Taxonomy:4565
T3 Species 65 71 barley
N3 Reference T3 Taxonomy:4513
T4 Species 76 81 maize
N4 Reference T4 Taxonomy:4577
T5 Species 243 263 Fusarium graminearum
N5 Reference T5 Taxonomy:5518
T6 Species 281 285 FGSC
N6 Reference T6 Taxonomy:5518
T7 Species 311 316 wheat
N7 Reference T7 Taxonomy:4565
T8 Species 318 324 barley
N8 Reference T8 Taxonomy:4513
T9 Species 329 334 maize
N9 Reference T9 Taxonomy:4577
T10 Species 656 660 FGSC
N10 Reference T10 Taxonomy:5518
T11 Species 715 720 maize
N11 Reference T11 Taxonomy:4577
T12 Species 766 771 wheat
N12 Reference T12 Taxonomy:4565
T13 Species 775 781 barley
N13 Reference T13 Taxonomy:4513
T14 Species 796 810 F. graminearum
N14 Reference T14 Taxonomy:5518
T15 Species 846 850 FGSC
N15 Reference T15 Taxonomy:5518
T16 Species 883 888 wheat
N16 Reference T16 Taxonomy:4565
T17 Species 893 899 barley
N17 Reference T17 Taxonomy:4513
T18 Species 963 968 maize
N18 Reference T18 Taxonomy:4577
T19 Species 1077 1092 Fusariumboothii
N19 Reference T19 Taxonomy:282271
T20 Species 1097 1111 F. graminearum
N20 Reference T20 Taxonomy:5518
T21 Species 1120 1125 maize
N21 Reference T21 Taxonomy:4577
T22 Species 1166 1176 F. boothii
N22 Reference T22 Taxonomy:282271
T23 Species 1198 1212 F. graminearum
N23 Reference T23 Taxonomy:5518
T24 Species 1261 1271 F. boothii
N24 Reference T24 Taxonomy:282271
T25 Species 1451 1455 FGSC
N25 Reference T25 Taxonomy:5518
T26 Species 1477 1491 F. graminearum
N26 Reference T26 Taxonomy:5518
T27 Species 1527 1532 maize
N27 Reference T27 Taxonomy:4577
T28 Species 1564 1568 FGSC
N28 Reference T28 Taxonomy:5518