Mapping of quantitative trait loci for seminal root morphology and gravitropic response in rice |
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Authors: | Gareth J Norton Adam H Price |
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Institution: | (1) Department of Plant and Soil Science, School of Biological Sciences, University of Aberdeen, Aberdeen, AB24 3UU, UK |
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Abstract: | In order to gain a better understanding of the complex root traits observed in previous studies using a mapping population
derived from a Bala × Azucena cross, an experiment was conducted growing plants in agar-filled Perspex chambers with the aim
of identifying quantitative trait loci (QTLs) for both seminal root morphology (SRM) and gravitropic response. A total of
four main effect QTLs were detected for SRM (a measurement of the degree of a wavy/curly seminal root phenotype); two were
located on chromosome 2, one at the top of chromosome 3 and one on chromosome 11. Two main effect QTLs were detected for the
gravitropic response (the degree of bending of the growing seminal root when subjected to a 90° rotation); one on chromosome
6 and 1 on chromosome 11. As well as main effect QTLs, an epistatic interaction was observed for each of the traits. For SRM
an interaction was detected between the top and the bottom of chromosome 4. For the gravitropic response an interaction was
observed between a location on chromosome 6 and 11. Both these interactions were confirmed by analysis of variance using marker
classes and the epistatic gravitropic response was also confirmed using a pair of near isogenic lines. All the SRM QTLs detected
in this experiment co-localise with root growth QTLs (root penetration or morphology) detected previously in the mapping population.
This information could prove valuable in attempts to identify candidate genes for these potentially valuable QTLs because
we could postulate that the underlying genes should be involved in the pathway of gravity detection, signal transduction or
the growth response to gravity. |
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Keywords: | QTL mapping Rice Seminal root morphology Root gravitropism |
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