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QTLs for nutritional contents of rice seedlings (Oryza sativa L.) in solution cultures and its implication to tolerance to iron-toxicity


Iron toxicity is one of the major constraints for lowland rice production in highly weathered soils, which are widely distributed in tropics and subtropics and often lack macronutrients such as potassium (K) and phosphorus (P). To analyze the genetic factors for excess iron accumulation under K or P deficiency, a set of seedlings in F3 and F8 generations from an Oryza sativa cross between a japonica cultivar ‚Gimbozu’ and an indica cultivar ‚Kasalath’ were raised and exposed to nutritional stresses in a short period under nutritional solutions. In the F8 lines, contents of K, P, Fe, and Mg in dried shoots were measured. Quantitative trait loci (QTL) for the iron accumulation and related mineral contents in each plant were analyzed with composite interval mapping. QTLs for the Fe, P and Mg content in shoots were compared in the maps of F3 and F8. The QTLs for the Fe content in shoots varied in three types of nutritional conditions, but consistently indicated two overlapping regions on chromosome 3 and 4. The obtained QTLs were crosschecked with those reported before. Some of these QTLs were indicative of iron excluding the power of the root, which was expressed under reduced P content in solution.

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Dry weight of shoot


Fe content in shoot


K content in shoot


Mg content in shoot


P content in shoot


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Correspondence to Hiroshi Ikehashi.

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Shimizu, A., Guerta, C.Q., Gregorio, G.B. et al. QTLs for nutritional contents of rice seedlings (Oryza sativa L.) in solution cultures and its implication to tolerance to iron-toxicity. Plant Soil 275, 57–66 (2005).

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  • iron-toxicity
  • multiple nutritional disorders
  • nutritional screening
  • Oryza sativa L.
  • QTL (quantitative trait loci)