INTROGRESIÓN DE FUENTES DE RESISTENCIA A ROYA COMÚN Y TIZÓN FOLIAR EN LÍNEAS ENDOCRIADAS DE MAÍZ (Zea mays L.)

PEÑAS BALLESTEROS, A; MONTENEGRO LD; DEFACIO RD; MARTÍNEZ E; FERRER ME; IGLESIAS J

Pergamino, Buenos Aires

Congreso; XII Congreso Nacional de Maíz; 2022

Asociación de Ingenieros Agrónomos del Norte de Buenos Aires

Maize (Zea mays L.) is one of the most important crops worldwide and is affected byseveral pathogens that put productivity and grain quality at risk. Common rust (Pucciniasorghi) and northern corn leaf blight (Exserohilum turcicum) are among the mostimportant diseases affecting maize at the Corn Belt region of Argentina. The aim of thepresent work was to characterize the potential of four maize landraces (ARZM05074,ARZM08096, ARZM13057 (resistant ones) and ARZM04044 (susceptible)) as donorsof favorable alleles to improve disease resistance to both pathogens. In 2018/2019landraces were crossed to three inbreed lines, used as a female parent (LP29 (resistant),LP221 (moderately resistant) and LP2542 (susceptible)). In 2019/2020 the G1 crosses(population×inbred), were evaluated under infection with P. sorghi and E. turcicum. Adiallel analysis of G1 displayed important GCA values revealing that additive geneticeffects were predominant for both traits. Indeed, ARZM05074 stands out as potentialdonor of favorable alleles for disease resistance to P. sorghi and E. turcicum. Theresults presented here would help to broaden the genetic base of maize breedingprograms and to achieve food security in a sustainable manner. Further research shouldbe conducted in a broader environmental range.