International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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Original Research Articles                      Volume : 7, Issue:6, June, 2018

PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
Email : /
Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2018: 95.39
NAAS RATING 2020: 5.38

Int.J.Curr.Microbiol.App.Sci.2018.7(6): 1940-1946

Mapping QTLs for resistance to Northern Leaf Blight in Tropical Maize (Zea mays L.)
Shridhar Hegde1*, M. Kumar2, Mahantesh Gangashetti3 and N. Meenakshi Ganesan4
1Centre for Plant Breeding and Genetics, Tamil Nadu Agricultural University,
Coimbatore, Tamil Nadu, India
2Department of cotton, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, India
3Directorate of Research, Tamil Nadu Agricultural University, Coimbatore, Tamilnadu, India
4Pioneer Hi-Bred Pvt. Ltd., Kallinayakanahalli 561 213, Gauribidanur, Chikkaballapur, Karnataka, India
*Corresponding author

Northern Corn Leaf Blight (NCLB or NLB) caused by Exserohilum turcicum is a common disease of maize in many parts of the world including India. Resistance to NCLB is complexly inherited and controlled by several quantitative trait loci (QTL) distributed across the genome. Phenotype as well as linked DNA marker based selection for resistance to NCLB is expected to be effective. Hence an investigation was carried out involving a total of 569 F2:3 families derived from two crosses viz., PH234 X PHBP3 and PH234 X PH84K, where PH234 is resistant parent and PHBP3 and PH84K are susceptible parents. During rainy 2016 and 2017 seasons, these F3 progenies were screened for their reaction to NLB. Characterization of QTLs affecting resistance to NLB was undertaken using the genetic linkage map with polymorphic SNP marker loci and the phenotypic data of F2:3 families. Total five QTLs conferring resistance to NLB were identified which were spread on chromosomes 2, 3, 4, 7 and 10. While the QTL on chromosome 7 was more consistent, others were less consistent. Phenotypic variation explained by these QTLs varied from 3% to 16%. The detection of more than one QTL supports the hypothesis that quantitative genes control resistance to Exserohilumturcicum.

Keywords: Maize, northern leaf blight, SNPs, Linkage map, QTLs

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How to cite this article:

Shridhar Hegde, M. Kumar, Mahantesh Gangashetti and N. Meenakshi Ganesan. 2018. Mapping QTLs for resistance to Northern Leaf Blight in Tropical Maize (Zea mays L.).Int.J.Curr.Microbiol.App.Sci. 7(6): 1940-1946. doi:
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