New quantitative trait loci (QTLs) for turcicum leaf blight in maize

Rajesh Singh¹, RP Srivastava²

¹Genetics and Plant Breeding, IAS, BHU, Varanasi -221005

²Department of Agriculture, Quantum Global Campus, Mandawar, Roorkee, Dehradun-247167

Received: 16 April 2017                    Revised Accepted: 18 June 2017

ABSTRACT

Turcicum Leaf Blight (TLB) is an important maize disease which causes heavy loss every year. A study was conducted to identify quantitative trait loci (QTLs) for NCLB resistance in maize. A mapping population from F_2:3 families were developed involving the two inbred lines viz., CM 212 (susceptible) and CM 338 (resistant) and evaluated in two Indian environments (Varanasi, Uttar Pradesh and Nagenahalli, Karnataka) to locate and map QTLs. Data on four disease severity traits viz., Percent Disease Index (PDI), Area under Disease Progress Curve (AUDPC-PDI) based on PDI, Lesion Area (LA), AUDPC based on lesion area (AUDPC-LA) were generated for QTL mapping. Four QTLs were identified on 4^th chromosome of maize.

Key Words: Area Under Diseases Progress Curve (AUDPC), Percent Diseases Index (PDI), Quantitative Trait Loci (QTL), Turcicum leaf blight (TCLB)