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GrainGenes Reference Report: TAG-92-230

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Reference	TAG-92-230
Title	Identification of QTLs affecting traits of agronomic importance in a recombinant inbred population derived from a subspecific rice cross
Journal	Theoretical and Applied Genetics
Year	1996
Volume	92
Pages	230-244
Author	Xiao J Li J Yuan L Tanksley S
Abstract	To detect QTLs controlling traits of agronomic importance in rice, two elite homozygous lines 9024 and LH422, which represent the indica and japonica subspecies of rice (Oryza saliva), were crossed Subsequently a modified single-seed-descent procedure was employed to produce 194 recombinant inbred lines (F8). The 194 lines were genotyped at 141 RFLP marker loci and evaluated in a field trial for 13 quantitative traits including grain yield. Transgressive segregants were observed for all traits examined. The number of significant QTLs (LOD greater than or equal to 2.0) detected affecting each trait ranged from one to six. The percentage of phenotypic variance explained by each QTL ranged from 5.1% to 73.7%. For those traits for which two or more QTLs were detected, increases in the traits were conditioned by indica alleles at some QTLs and japonica alleles at others. No significant evidence was found for epistasis between markers associated with QTLs and all the other markers. Pleitropic effects of single QTLs on different traits are suggested by the observation of clustering of QTLs. No QTL for traits was found to map to the vicinity of major gene loci governing the same traits qualitatively. Evidence for putative orthologous QTLs across rice, maize, oat, and barley is discussed.
Keyword	[ Hide all but 1 of 24 ] agronomic-characteristics alleles chromosome-maps crosses crossing gene-mapping genetic markers genetic variance inbred-lines indica-varieties japonica-varieties loci oryza sativa phenotype phenotypic-variance pleiotropy quantitative genetics quantitative-trait-loci quantitative-traits recombinant-inbred-lines restriction fragment length polymorphism segregation transgressive-segregation varieties

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