Marker-assisted development of near-isogenic lines for scab resistance qtls of wheat
CEREAL RESEARCH COMMUNICATIONS(2008)
摘要
Fusarium head blight (FHB) or scab resistance in wheat is a complex quantitative trait. Near-isogenic lines (NILs) carrying single FHB resistance QTL are valuable genetic stocks for genetic analysis and breeding. In previous studies, we mapped type I resistance QTLs against initial penetration and type 11 QTLs against fungal spread within spikes in the Nanda2419 x Wangshuibai RIL population. Using the molecular markers linked to the QTLs, we have developed NILs for four of the FHB resistance QTLs by marker-assisted introgression into the susceptible line Mianyang99-323. Background examination indicated that the recipient genome contents of the NILs have reached over 98% after three generations of backcross. These NILs showed significantly better resistance than the recurrent parent, providing another piece of evidence for successful enhancement of scab resistance by marker-assisted selection.
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关键词
wheat,FHB resistance,QTL near-isogenic lines,marker-assisted selection
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