AI Article Synopsis
- Significant root elongation in rice varieties was observed under phosphorus-deficient conditions, with notable differences in response among 62 varieties.
- Researchers selected two contrasting varieties ('Gimbozu' and 'Kasalath') to create hybrids for analyzing quantitative trait loci (QTLs) related to root elongation.
- A significant QTL linked to root elongation was found on chromosome 6, which explained about 20% of the variability and may also influence the plant's ability to manage iron levels in shoots, aiding in the development of better rice varieties for nutrient deficiencies.
Article Abstract
A significant level of root elongation was induced in rice (Oryza sativa) grown under phosphorus-deficient conditions. The root elongation clearly varied among a total of 62 varieties screened under two different phosphorus levels. Two contrasting varieties, 'Gimbozu', with a low elongating response and 'Kasalath', with a high elongating response, were chosen and crossed to produce a hybrid population for QTL analyses. QTLs for the phosphorus deficiency-induced root elongation were detected by two linkage maps, i.e., one with 82 F3 families constructed by 97 simple sequence repeat (SSR) and sequence-tag site markers and another with 97 F8 lines by 790 amplified fragment length polymorphism and SSR markers. A single QTL for the elongation response was detected on chromosome 6, with a LOD score of 4.5 in both maps and explained about 20% of total phenotypic variance. In addition, this QTL itself, or a region tightly linked with it, partly explained an ability to reduce accumulation of excess iron in the shoots. The identified QTL will be useful to improve rice varieties against a complex nutritional disorder caused by phosphorus deficiency and iron toxicity.
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| http://dx.doi.org/10.1007/s00122-004-1751-4 | DOI Listing |
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