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Yuxiang Zeng, Yuan Chen, Zhijuan Ji, Yan Liang, Anfu Zheng, Zhihua Wen and Changdeng Yang

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.

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