Phenotypic characterisation and evaluation of resistance to Fusarium ear rot, fumonisin contamination and agronomic traits in a collection of maize landraces
Lorenzo Stagnati A B # , Alessandra Lanubile
A B # * , Giovanna Soffritti A , Paola Giorni A , Graziano Rossi C , Adriano Marocco A B and Matteo Busconi A B
A
B
C
Handling Editor: Zed Rengel
Abstract
Maize is a major crop in Italy and is constantly affected by the fungus Fusarium verticillioides, producing ear rot and grain contamination by fumonisins. Finding new genotypes resistant to Fusarium infection is an important goal for the improvement of maize cultivation.
The objective of this work was to test a collection of 33 traditional landraces from the Emilia-Romagna (Italy) region for Fusarium ear rot (FER) severity, fumonisin content, and their agronomic performance.
Primary ears were artificially inoculated with a toxigenic strain of F. verticillioides in a 2-year experimental trial. The landrace ‘Nostrano di Storo’ and a commercial hybrid of FAO maturity class 300 were also included and used as comparisons representing a well-known and highly valued landrace and a modern flint hybrid, respectively.
The collection showed great phenotypic variability for all the agronomic traits assessed and responded differently to the Fusarium infection with percentages of FER ranging from 6.6% to 49.3%, and fumonisins from 4.3 mg/kg to 34.5 mg/kg. Thirteen and six landraces displayed FER percentages and fumonisin content very similar to the hybrid, respectively. Moreover, eight landraces exhibited grain yield values comparable to the hybrid. Interestingly, Va221, Va227 and EMR03 showed the best combination among these three traits.
This local material can be considered suitable for breeding purposes targeting the development of FER and fumonisin resistant germplasm.
The collection may represent a resource for future research aimed at evaluating the response to multiple pathogens and their associated mycotoxins.
Keywords: agrobiodiversity, ear morphology, Emilia-Romagna region, fumonisins, Fusarium verticillioides, grain yield, kernel type, maize germplasm.
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