QTL mapping for Type II resistance to Fusarium head blight and spike architecture traits in bread wheat

CENDOYA MARIA GABRIELA; MALBRÁN ISMAEL; LORI GLADYS ALBINA; ALONSO MARÍA PÍA; FRANCO MARÍA FIORELLA; PANELO JUAN SEBASTIÁN; PONTAROLI ANA CLARA

CROP BREEDING AND APPLIED BIOTECHNOLOGY

BRAZILIAN SOC PLANT BREEDING

Lugar: Viçosa, Minas Gerais; Año: 2022 vol. 22 p. 1 - 9

1518-7853

In breeding for resistance to Fusarium head blight (FHB) there should be precisedifferentiation between QTL for resistance and those for spike architecture traits that indirectlyaffect disease. QTL mapping for FHB Type II resistance and spike architecture traits was carriedout in a population of 80 RIL. Three QTL for FHB Type II resistance were identified respectively onchromosomes 2A, 4A and 6D; the latter is reported here for the first time. The number of florets perspike and per spikelet was associated with FHB Type II resistance but there was not co-localizationbetween QTL for these traits. However, QTL for number of spikelets per spike overlapped withthose for FHB Type II resistance on chromosomes 2A and 6D. Spike architecture traits -notably,the number of spikelets and florets per spike- should be considered in the design of breedingstrategies to increase Type II resistance to FHB in bread wheat.