Mapping Resistance to Argentinean Fusarium (Graminearum) Head Blight Isolates in Wheat.

Carolina Sgarbi,Marcos Yanniccari,Ismael Malbrán,Mian Abdur Rehman Arif,Ana Maria Castro,Luciana Saldúa,Andreas Börner,Ulrike Lohwasser,Gladys Albina Lori

doi:10.3390/ijms222413653

Abstract

Fusarium head blight (FHB) of wheat, caused by Fusarium graminearum (Schwabe), is a destructive disease worldwide, reducing wheat yield and quality. To accelerate the improvement of scab tolerance in wheat, we assessed the International Triticeae Mapping Initiative mapping population (ITMI/MP) for Type I and II resistance against a wide population of Argentinean isolates of F. graminearum. We discovered a total of 27 additive QTLs on ten different (2A, 2D, 3B, 3D, 4B, 4D, 5A, 5B, 5D and 6D) wheat chromosomes for Type I and Type II resistances explaining a maximum of 15.99% variation. Another four and two QTLs for thousand kernel weight in control and for Type II resistance, respectively, involved five different chromosomes (1B, 2D, 6A, 6D and 7D). Furthermore, three, three and five QTLs for kernel weight per spike in control, for Type I resistance and for Type II resistance, correspondingly, involved ten chromosomes (2A, 2D, 3B, 4A, 5A, 5B, 6B, 7A, 7B, 7D). We were also able to detect five and two epistasis pairs of QTLs for Type I and Type II resistance, respectively, in addition to additive QTLs that evidenced that FHB resistance in wheat is controlled by a complex network of additive and epistasis QTLs.

Highlights

Fusarium head blight (FHB) or scab, caused mainly by Fusarium graminearum (Schwabe) and F. culmorum (WG Smith) Sacc, is one of the most important fungal diseases affecting wheat in cereal producing areas of the world [1,2,3]
The Synthetic parent showed no significant differences with Sumai 3 for SE (Figure 1)
Regardless of the results reported previously, we conclude that 4D and 6D carry favorable alleles provided by Synthetic, which improved both Type I and infection [11]; (II) resistances to FHB

Summary

Introduction

Fusarium head blight (FHB) or scab, caused mainly by Fusarium graminearum (Schwabe) and F. culmorum (WG Smith) Sacc, is one of the most important fungal diseases affecting wheat in cereal producing areas of the world [1,2,3]. The damages induced by the disease are further aggravated by the frequent presence of mycotoxins in affected grains These persistent, thermo-stabile metabolites, produced in association with food and feeds, may cause health problems to human and animals even in low doses [4,5]. Monoculture, reduced tillage and maize/wheat rotations have greatly increased the level of inoculum in the soil and, the risk for epidemics of FHB [5]. They can reduce the damage induced by the disease to some extent, agronomic practices and fungicides currently available are far from effective at preventing the occurrence of epidemics. The development of resistant cultivars is the most economic, effective and environmental friendly approach to manage this disease [6]

Methods

Results

Discussion

Conclusion