Identification of the QTLs associated with resistance to northern corn leaf blight, southern rust and downy mildew diseases in Maize (Zea mays L)

Name: Oo, Nay Nay

LCSH: Kasetsart University -- Dissertations. Ph.D. (Agricultural Sciences) 2022.

Classification :.LCCS: SB608.M2

LCSH: Kasetsart University. -- Faculty of Agriculture at Kamphaeng Saen -- Dissertations.

LCSH: Corn -- Diseases and pests.

LCSH: Corn -- Disease and pest resistance.

LCSH: Corn blast disease.

Abstract: The foliar diseases northern corn leaf blight (NCLB), southern corn rust (SCR), and downy mildew (DM) are very important yield-limiting factors for maize growing regions of the world. Host resistance is more effective in controlling these diseases. The genetics of resistance have evolved as quantitative, indicating the need to discover quantitative trait loci (QTL) to initiate effective marker-assisted breeding strategies. Genome-wide association studies (GWAS) can efficiently discover genomic loci associated with phenotypic traits. In this study, the phenotypes of 277 recombinant inbred lines of maize with two isolates of NCLB disease were examined. Subsequently, the phenotypes of 262 lines in two isolates of SCR and one isolate of DM were examined for resistance. Using 434,871 SNP markers obtained from the SNP-600K genotyping array for maize, GWAS was performed with the Fixed and random model Circulating Probability Unification (FarmCPU) model using the Genomic Association and Prediction Integrated Tool (GAPIT) software. The results showed that 5 SNP markers or QTLs associated with NCLB resistance were identified on chromosomes 1, 2, 4, 6, and 9. In addition, 8 identical candidate genes were associated with plant defense mechanisms against NCLB disease. At SCR, 3 QTLs on chromosomes 3, 4, and 10 were significantly associated with resistance to SCR disease. Subsequently, 9 candidate genes were identified. For DM, only one QTL on chromosome 1 associated with resistance to DM and 1 candidate gene having a function in the plant protection mechanism were identified. These QTLs/SNP loci should be validated and will be useful for markerassisted selection and for a better understanding of resistance to NCLB, SCR, and DM in maize development.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Jintana Unartngam

Role: Thesis Advisor

Name: Vinitchan Ruanjaichon

Role: Thesis Co-Advisor

Name: Kularb Laosatit

Role: Thesis Co-Advisor

Name: Theerayut Toojinda

Role: Thesis Co-Advisor

Created: 2022

Modified: 2025-06-24

Issued: 2025-06-24

วิทยานิพนธ์/Thesis

วิทยานิพนธ์/Thesis

application/pdf

URL: http://www.lib.ku.ac.th/KUthesis/2565/nay-nay-all.pdf

CallNumber: SB608.M2.O56

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degraee

Descipline: Agricultural Sciences

Grantor: Kasetsart University

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