Control of plant height by 24 alleles at 12 quantitative trait loci in rice

Abstract

Plant height (PH) is controlled by quantitative trait loci (QTLs) in rice. In the present study, a recombinant inbred line population developed by crossing two rice cultivars, Lemont and Yangdao4, was grown in eight environments for QTL analysis. Multiple interval mapping detected 53 PH-QTLs, 39 of which clustered at 12 chromosome regions/putative loci. An examination of the 12 putative loci identified 24 alleles that are simultaneously involved in controlling PH. Linear regression analyses suggested that these 24 alleles function additively across the 12 loci to control PH, and plants carrying more PH-increasing alleles at the 12 loci were taller than those carrying more PH-decreasing alleles. Multiple comparison tests indicated that the effect of a single allele at the 12 loci was small and that multiple alleles must be pyramided to attain a statistically significant effect. The closest markers to the 12 loci can be used directly in marker-assisted breeding to manipulate PH.

QTLs and Candidate Loci Associated with Drought Tolerance Traits of Kaybonnet x ZHE733 Recombinant Inbred Lines Rice Population

“…The majority of the QTL found in this study were mapped to regions that were similar to those found in earlier studies [16,[128][129][130][131][132][133][134]. According to many studies (including those by Lanceras et al in [138], and Xu et al in 2020 [139]), chromosome 1 has the highest concentration of QTLs for PH (qPHC1.1). Most of the QTLs connected to grain yields were found on chromosomes 5 and 6 (qTPBC6.2, qFGC5.1, qFGD5.1, and qFGC6.2) [45,127,131,[140][141][142].…”

Detection of QTLs for Plant Height Architecture Traits in Rice (Oryza sativa L.) by Association Mapping and the RSTEP-LRT Method

“…In addition, higher activity of the SBI significantly reduced the rice PH, and, therefore, its application in rice production contributed to breed improved lodging-resistant rice varieties and thus increased yield. Although several studies on associations between markers and the plant height have been conducted in rice [ 10 , 30 , 31 , 32 , 33 ], to date, no report has documented a QTL analysis of the relationships between plant height and its components traits (panicle length and the length of all internodes), using two mapping strategies.…”