Genetic Relationship Between Maize Resistance to Corn Borer Attack and Yield

Abstract

-Selection for reduced stalk tunnel length by the Mediterranean corn borer (MCB, 12 Sesamia nonagrioides Lef.), while maintaining yield under infestation, has already been evaluated. 13Significant reductions for tunnel length were reported, but yield showed a non significant 14 tendency to decrease with selection that could be due to increased inbreeding or significant 15 genetic correlation between yield and resistance. Simultaneously, the presence of major QTLs for 16 resistance in chromosome 4 has been suggested. In the present study, we investigated the genetic 17 relationship between yield and stalk tunneling resistance by conducting one generation of 18 selection each for yield alone, resistance alone, and yield and resistance combined in a broad-

Usefulness of marker‐assisted selection to improve maize for increased resistance to Sesamia nonagrioides attack with no detrimental effect on yield

“…Adverse effects on yield when applying phenotypic selection for increased resistance to stem tunneling by MCB corn borers agreed with results obtained in other breeding programs and give further support to the notion that trade-offs may exist between growth and yield versus defense against herbivores (Klenke et al, 1986;Butron et al, 2012Rosenthal andDirzo, 1997;Butron et al, 2012) regulator activated a defensive pathway and was sufficient to increase resistance to insects, but this activation conferred a cost in plant productivity. In the same way, Butron et al (2012) showed that breeding for increased when yield made plants more susceptible tois improved stem tunneling by MCBtunnel length increases (Butron et al, 2012).…”

“…Similarly, in previous studies, indirect effects on plant and ear heights have been observed when selection for increased resistance has been performed (Sandoya et al, 2010;Butron et al, 2012). In a previous study (Butron et al, 2012), Butron et al (2012) showed it has been even shown that markers potentially linked to plant height could have some effect on tunnel length under determined conditions.…”

“…Indirect changes on ear and plant height suggested that selections for an indexes in which yield is prioritized could be detrimental for resistance in the medium-long term because tunnel length made by corn borers and plant height are often tightly associated (Jímenez-Galindo et al, 2017;Ordas et al, 2010;Schon et al, 1993;Samayoa et al, 2015;Samayoa et al, 2014). Similarly, in previous studies, indirect effects on plant and ear heights have been observed when selection for increased resistance has been performed (Sandoya et al, 2010;Butron et al, 2012). In a previous study (Butron et al, 2012), Butron et al (2012) showed it has been even shown that markers potentially linked to plant height could have some effect on tunnel length under determined conditions.…”

“…Maize attack by MCB larvae Stem damage by borers resulted results in extensive stem tunneling that increasesd lodging, early leaf senescence, interference with translocation of metabolites and, consequently, yield losses (Malvar et al, 2008). Two decades of investigations on maize resistance to stalk corn borers, especially to the Mediterranean corn borer (MCB), have shown that breeding for reduced increased resistance to stem tunneling by MCB often resulted in reduced yield (Butron et al, 2012). Accordingly Con formato: Fuente: Cursiva with these results, high genetic correlation coefficients between yield potential and resistance susceptibility as well as localization of genomic regions with opposing effects on both traitsresistance to stem tunneling by MCB and yield have been reported (Jímenez-Galindo et al, 2017;Ordas et al, 2010).…”

Selection efficiency of tunnel length and stalk breakage to obtain maize inbred lines resistant to stem borer attack

“…In general, tunnel length is better as selection criteria for increasing resistance to corn borers, but, in some genetic backgrounds, genetic linkage between yield and stalk tunneling by stem borers could make that selection for reduced tunnel length resulted in significant yield reductions (Schulz et al 1997;Kreps et al 1998;Butrón et al 2012). Pedigree selection for reduced tunnel length was successful for developing inbreds, such as EP105, that in hybrid combinations were comparable to hybrid checks for agronomic performance.…”