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Plant and Cell Physiology, 2002, Vol. 43, No. 12 1526-1533
© 2002 Oxford University Press

QTL Analysis of Al Tolerance in Recombinant Inbred Lines of Arabidopsis thaliana

Yuriko Kobayashi and Hiroyuki Koyama1

Laboratory of Plant Cell Technology, Faculty of Agriculture, Gifu University, 1-1 Yanagido, Gifu, 501-1193 Japan

Quantitative trait loci (QTLs) and epistasis for Arabidopsis thaliana aluminum (Al) tolerance were analyzed using a recombinant inbred (RI) population of 100 lines derived from a cross between Landsberg erecta and Columbia (Col). Root growth of the RI population was determined in hydroponics using solutions containing 0 or 4 µM of AlCl3 and a series of nutrients, except Pi, at pH 5.0. Al tolerance was defined as relative root length [RRL: plus Al/minus Al (%)], and the RI lines ranged from 22.6 to 97.4% with a broad sense heritability of 0.99. Using the composite interval mapping method, two significant single factor QTLs (P<0.05) were detected by RRL on chromosomes 1 and 4, where the Col allele showed positive and negative effects on the Al tolerance. These QTLs could explain about 43% of the total variation of Al tolerance among the RI population. On the other hand, five epistatic loci pairs were identified by the complete pair-wise search method (P<0.0005). No single factor QTL and epistatic loci pairs were shared by the root length in the control and the RRL, suggesting that the loci identified by the RRL would be specific for Al treatment and controlling Al tolerance among the RI population.

1 Corresponding author: E-mail, koyama@cc.gifu-u.ac.jp; Fax, +81-58-293-2911.


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