Study on rice root system under drought stress and discovery of QTL by genome wide association study (GWAS) using landrace and cultivated Rice

Name: Piyapond Puekphong

LCSH: Kasetsart University -- Theses. M.S. (Agronomy) 2022.

Classification :.LCCS: SB191.R5

LCSH: Kasetsart University. -- Department of Agronomy -- Theses.

LCSH: Rice -- Breeding.

LCSH: Rice -- Effect of drought on.

LCSH: Rice -- Genetics.

Abstract: Drought is one of the important factors affecting in rice production, especially during reproductive stage. This research aims to study on rice performance under well-watered (WW) and drought stress (DS) conditions and identify QTL for root morphological and anatomical traits by GWAS in diverse population. Field experiments were conducted with 236 rice accessions in lattice design with 3 replications. WW and DS were established at 55 days after seeding (DAS) until 86 DAS. After that, rice performance including morphological traits, root architecture traits and anatomy traits were measured. The results showed that drought stress decrease in plant height (PH), tiller number (TN), biomass (BIO), grain yield (YIE) and nodal root number per tiller (NT) by 19%, 21%, 48%, 39% and 34%, respectively. However, anatomical traits under DS showed greater than WW including root thickness (RTH), cortical area (CTA) and stele area (STA). Under well-watered condition, YIE had significant and positively correlated with TN (r=0.178). BIO had significantly and positively correlated with PH (r = 0.433 **), while it was significantly and negatively correlated with DTF (r = -0.288**). In addition, TN had significantly negative correlation with PH (r= -0.519**). In Drought stress condition, YIE had negatively correlated with FW (r= -0.234) and NT (r=- 0.162) but it showed positively correlated with BIO (r=0.246). Moreover, one thundered eighty-six significant nucleotide polymorphisms (SNPs) were identified by association mapping. Then 161 candidate genes were detected in root traits that involve root development. These results suggested that nodal root number and lateral density are importance traits for rice performance under drought stress and 32 genes were associated with drought tolerance in rice. Future research may provide important tools for drought tolerant breeding program to develop new varieties.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Chanate Malumpong

Role: Thesis Advisor

Name: Theerayut Toojinda

Role: Thesis Co-Advisor

Name: Jonaliza L. Siangliw

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/piyapond-puek-all.pdf

CallNumber: SB191.R5.P59

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Agronomy

Grantor: Kasetsart University

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