QTL mapping of a partial resistance to the corn delphacid‐transmitted viruses in Lepidopteran‐resistant maize line Mp705

Abstract

A partial resistance to maize mosaic virus (MMV) and maize stripe virus (MStV) was mapped in a RILs population derived from a cross between lines MP705 (resistant) and B73 (susceptible). A genetic map constructed from 131 SSR markers spanned 1399 cM with an average distance of 9.6 cM. A total of 10 QTL were detected for resistance to MMV and MStV, using composite interval mapping. A major QTL explaining 34–41% of the phenotypic variance for early resistance to MMV was detected on chromosome 1. Another major QTL explaining up to 30% of the phenotypic variation for all traits of resistance to MStV was detected in the centromeric region of chromosome 3 (3.05 bin). After adding supplementary SSR markers, this region was found to correspond well to the one where a QTL of resistance to MStV already was located in a previous mapping study using an F2 population derived from a cross between Rev81 and B73. These results suggested that these QTL of resistance to MStV detected on chromosome 3 could be allelic in maize genome.

Quantitative Trait Locus Analysis for Yield Traits of Cassava (<i>Manihot</i> <i>esculenta</i> Crantz)

“…A precise and reliable phenotypic evaluation is one of the main prerequisites for QTL mapping [29] . In the present study, the 4 unconditional QTLs and 5 conditional QTLs affecting cassava HI were located on six LGs (LGs 2, 4, 7, 9, 11, and 12) (Figure 2 and Table 6).…”