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  • Title: Genetic analysis of rooting ability of transplanted rice (Oryza sativa L.) under different water conditions.
    Author: Ikeda H, Kamoshita A, Manabe T.
    Journal: J Exp Bot; 2007; 58(2):309-18. PubMed ID: 17075079.
    Abstract:
    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 (DeltaRW) 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 DeltaRW 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 DeltaRW 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.
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