Mapping of QTLs conferring resistance to bacterial leaf streak in rice |
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Authors: | D Tang W Wu W Li H Lu A J Worland |
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Institution: | (1) College of Crop Sciences, Fujian Agricultural University, Fuzhou, Fujian, China Fax: +86-591-3744744 e-mail: wuwr@fjau.edu.cn, CN;(2) Cereals Research Department, John Innes Centre, Norwich, NR4 7UH, UK, GB |
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Abstract: | A large F2 and a RI population were separately derived from a cross between two indica rice varieties, one of which was highly resistant to bacterial leaf streak (BLS) and the other highly susceptible. Following
artificial inoculation of the RI population and over 2 years of testing, 11 QTLs were mapped by composite interval mapping
(CIM) on six chromosomes. Six of the QTLs were detected in both seasons. Eight of the QTLs were significant following stepwise
regression analysis, and of these, 5 with the largest effects were significant in both seasons. The detected QTLs explained
84.6% of the genetic variation in 1997. Bulked segregant analysis (BSA) of the extremes of the F2 population identified 3 QTLs of large effect. The 3 QTLs were dentical to 3 of the 5 largest QTLs detected by CIM. The independent
detection of the same QTLs using two methods of analysis in separate mapping populations verifies the existence of the QTLs
for BLS and provides markers to ease their introduction into elite varieties.
Received: 13 October 1999 / Accepted: 29 October 1999 |
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Keywords: | Rice Bacterial leaf streak Mapping Bulked segregant analysis QTL |
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