Qtls Mapping for Turcicum Leaf Blight Resistance in Maize (Zea Mays L.)

Abstract

Turcicum leaf blight (TLB) is a prevalent maize disease found throughout the world, including India. To identify quantitative trait loci (QTLs) for TLB resistance with the help of appropriate mapping populations, namely F_2:3 families and F_2:6 families or recombinant inbred lines (RILs) evaluated in two environments were investigated. The cross CM 212 × V 336 was selected to generate the F_2:3 families and the established F_2:3 mapping population of cross CM 212 x CM 145 was further advanced to generate the F_2:6 families for construction of linkage map and mapping of QTLs. The present investigation identified a total of 23 QTLs for TLB resistance in maize. Out of these QTLs, Nine QTLs were found in Linkage Group 4 (LG 4), followed by four QTLs in LG 2, two QTLs in each of LG 1, 3, 5 and 9 and one QTL in each of LG 6 and 7. On the other hand, the LOD values for these QTLs ranged from 2.64 to 14.84 in individual environments and over environments for both mapping populations, while the associated R² values ranged from 10.80 to 18.98. The majority of the QTLs had over dominance at their respective chromosomes due to gene action.

Bangladesh J. Bot. 51(2): 199-206, 2022 (June)