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JXB Advance Access originally published online on October 30, 2006
Journal of Experimental Botany 2007 58(2):309-318; doi:10.1093/jxb/erl162
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

Genetic analysis of rooting ability of transplanted rice (Oryza sativa L.) under different water conditions

H Ikeda1, A Kamoshita2,* and T Manabe3

1Field Production Science Center, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Midoricho, Nishitokyo, 188-0002 Japan
2Asian Natural Environmental Science Center, The University of Tokyo, Midoricho, Nishitokyo, 188-0002 Japan
3Plant Biotechnology Institute, Ibaraki Agricultural Center, Mito, 311-4203 Japan

* To whom correspondence should be addressed: E-mail: akamoshita{at}anesc.u-tokyo.ac.jp

In order to assess the benefits of superior rooting ability of rice (Oryza sativa L.) for growth after transplanting under water-limiting conditions, genetic differences in the rooting ability of rice seedlings 30 d after sowing, with their visible roots either pruned or not pruned, were quantified by several root parameters 4 d after transplanting (DAT), under flooded or non-flooded paddy fields (four treatments in total), together with production traits at maturity. Ninety-eight recombinant inbred lines from the two japonica ecotypes, a lowland variety Otomemochi, and an upland variety Yumenohatamochi, were genotyped with 107 simple sequence repeat (SSR) markers. Otomemochi in general produced more adventitious roots, partitioned a greater proportion of biomass to roots, and had a greater increment of root dry weight ({Delta}RW) at 4 DAT than Yumenohatamochi, but these variety differences were less clear under non-flooded conditions without root pruning. Several quantitative trait loci (QTLs) associated with rooting ability were identified mainly in chromosomes 1, 4, and 6 across the four treatments or in combined analysis. On the other hand, QTLs for {Delta}RW around RM2357 in chromosome 5 and for maximum new root length in RM215–RM205 in chromosome 9 were found only under root pruning treatments and under non-flooded conditions without root pruning, respectively. Greater {Delta}RW was associated with higher head dry weight per hill at maturity only in the non-flooded and root-pruning treatments. This study suggests the importance of rooting ability after transplanting and, possibly, other mechanisms for adaptation to non-flooded conditions.

Key words: Non-flooded paddy, rice (Oryza sativa L.), root pruning, transplanting, water scarcity


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