Genetic analysis and qtl mapping for grain chalkiness characteristics of brown rice (oryza sativa l)

Yang Qin, Suk Man Kim, Jae Keun Sohn

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10 Scopus citations

Abstract

Grain chalkiness is one of the important appearance qualities in rice marketing. But it is a complex trait, controlled by polygenes and easily influenced by the environment. Genetic analysis and QTL detection was carried out on six characteristics of grain chalkiness consisting of the percentage of chalkiness (PGC), white belly (PWB) and white core grains (PWC), and the area of chalkiness (CA), white belly (WBA) and white core (WCA) in brown rice. A total of 16 main-effect QTLs associated with chalkiness characteristics of brown rice were mapped on seven chromosomes over two years. Among them, qPGC7.1 and qPWB7.2were simultaneously located on chromosome 7 flanked by 7038 and 7042 at LOD scores 4.34 and 3.76, while qPWC2.1 and qWCA2.1 were simultaneously located on chromosome 2 flanked by RM492 and RM324 with LOD scores of 2.50 and 3.39. Twelve epistatic combinations were detected for five chalkiness characteristics except for CA Results indicated that WBA was mainly influenced by the additive effects of main-effect QTLs. PGC and PWC were affected by the effects of epistatic QTLs and the interactions between additive-by-additive effects and the environment. The effects of epistatic QTLs and the main-effect QTLs played important roles on CA, PWB and WCA For the genetic improvement of grain chalkiness in breeding system, more attention should be paid to epistatic effects and the additive effects of main-effect QTLs.

Original languageEnglish
Pages (from-to)155-164
Number of pages10
JournalGenes and Genomics
Volume31
Issue number2
DOIs
StatePublished - Apr 2009

Keywords

  • Chalkiness characteristics
  • Epistatic effects
  • QTL and environment interactions
  • QTLs

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