QTL mapping of root aerenchyma formation in seedlings of a maize × rare teosinte 'Zea nicaraguensis' cross
| Autor: | Carlos Henry Loaisiga, R. McK. Bird, Hidekazu Takahashi, Fumie Omori, T. Takamizo, Bryan Kindiger, Yoshiro Mano |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Plant and Soil. 295:103-113 |
| ISSN: | 1573-5036 0032-079X |
| Popis: | Using a 141 F2 population generated from maize inbred B64 × teosinte Zea nicaraguensis cross, quantitative trait loci (QTLs) controlling aerenchyma formation in roots under non-flooding drained soil conditions were identified. Seedlings of Z. nicaraguensis formed clear aerenchyma in the cortex of adventitious roots in non-flooding conditions, whereas the maize inbred line B64 did not. In the F2 population, the capacity to develop aerenchyma exhibited wide and continuous variation, suggesting the trait was controlled by multiple genes. A linkage map was developed using 85 SSR markers, covering 1,224 cM across all ten chromosomes. Composite interval mapping analysis revealed that four QTLs for aerenchyma formation under non-flooding conditions were located to two regions of chromosome 1 (identified as Qaer1.02-3 and Qaer1.07), chromosome 5 (Qaer5.09) and chromosome 8 (Qaer8.06-7), and these explained 46.5% of the total phenotypic variance. The multiple interval mapping approach identified additional QTLs on chromosomes 1 (Qaer1.01) and 5 (Qaer5.01). Using these results, it may be possible to use SSR markers linked to aerenchyma formation in a marker assisted selection approach to introduce aerenchyma formation in drained soil conditions into maize for the eventual development of flooding tolerant maize hybrids. |
| Databáze: | OpenAIRE |
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