|DEL PONTE, E - Federal University Of Rio Grande Do Sul|
|TESSMANN, D - University Of Maringa|
|KUHNEM, P - Federal University Of Rio Grande Do Sul|
|GOMES, L - Federal University Of Rio Grande Do Sul|
|SPOLTI, P - Federal University Of Rio Grande Do Sul|
|NICOLLI, C - Federal University Of Rio Grande Do Sul|
|SILVA, C - University Of Maringa|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 5/14/2015
Publication Date: 5/14/2015
Citation: Del Ponte, E.M., Ward, T.J., Tessmann, D.J., Kuhnem, P.R., Gomes, L.B., Spolti, P., Nicolli, C.P., Silva, C.N. 2015. Multi-cereal molecular surveys suggest host preference among members of the Fusarium graminearum species complex from southern Brazil [abstract].
Technical Abstract: This study aimed to assess the extent and distribution of members of the Fusarium graminearum species complex (FGSC) associated with cereals grown in southern Brazil between 2009 and 2012. The total collection comprised 1,127 isolates, which were divided into four collections obtained from: 1) diseased wheat spikes from >150 wheat fields (n= 663 isolates); 2) maize kernels (n=104); 3) maize stubbles from 20 fields (n=271); and 4) rice kernels (n=89) from >100 flooded lowland rice fields. Multilocus genotyping was used to determine species identity and trichothecene genotypes for most isolates. In the wheat collection, F. graminearum with a 15-ADON genotype was dominant (83%), followed by F. meridionale with a NIV genotype (12.8%), F. cortaderiae with mostly NIV and a few 3-acetyl deoxynivalenol (3-ADON) (2.6%), F. austroamericanum with mostly 3-ADON and a few NIV (1.2%) and F. asiaticum with the NIV genotype (0.4%). Frequency of F. meridionale in wheat increased with the decrease in latitude. For the maize kernel collection, F. meridionale was dominant (72%), followed by F. graminearum with the 15-ADON genotype (14.5%) and F. cortaderiae with the 3-ADON and NIV genotypes (13.5%). For the maize stubble collection, F. meridionale was also dominant (50%), followed by F. graminearum with the 15-ADON genotype (30%) and F. cortaderiae with the NIV and 3-ADON genotypes (20%). For both maize collections, a higher number of species were found with increased latitude and elevation (>800m). For the rice collection, F. asiaticum with the NIV genotype was dominant (69%), followed by F. graminearum (14.6%) with the 15-ADON genotype, and F. cortaderiae (14.6%) and F. meridionale (0,01%), both with the NIV genotype. These results suggest strong effect of cereal host in shaping the composition and distribution of FGSC diversity in Brazil. The fact that NIV-producing species are dominant in maize and rice may have significant implications for food safety and the economics of cereal production.