Fine mapping of QTLs for rice grain yield under drought reveals sub-QTLs conferring a response to variable drought severities

Fine-mapping studies on four QTLs, qDTY 2.1 , qDTY 2.2 , qDTY 9.1 and qDTY 12.1 , for grain yield (GY) under drought were conducted using four different backcross-derived populations screened in 16 experiments from 2006 to 2010. Composite and Bayesian interval mapping analyses resolved the originall...

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Veröffentlicht in:Theoretical and applied genetics 2012-06, Vol.125 (1), p.155-169
Hauptverfasser: Dixit, Shalabh, Swamy, B. P. Mallikarjuna, Vikram, Prashant, Ahmed, H. U., Sta Cruz, M. T., Amante, Modesto, Atri, Dinesh, Leung, Hei, Kumar, Arvind
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container_issue 1
container_start_page 155
container_title Theoretical and applied genetics
container_volume 125
creator Dixit, Shalabh
Swamy, B. P. Mallikarjuna
Vikram, Prashant
Ahmed, H. U.
Sta Cruz, M. T.
Amante, Modesto
Atri, Dinesh
Leung, Hei
Kumar, Arvind
description Fine-mapping studies on four QTLs, qDTY 2.1 , qDTY 2.2 , qDTY 9.1 and qDTY 12.1 , for grain yield (GY) under drought were conducted using four different backcross-derived populations screened in 16 experiments from 2006 to 2010. Composite and Bayesian interval mapping analyses resolved the originally identified qDTY 2.1 region of 42.3 cM into a segment of 1.6 cM, the qDTY 2.2 region of 31.0 cM into a segment of 6.7 cM, the qDTY 9.1 region of 32.1 cM into two segments of 9.4 and 2.4 cM and the qDTY 12.1 region of 10.6 cM into two segments of 3.1 and 0.4 cM. Two of the four QTLs ( qDTY 9.1 and qDTY 12.1 ) having effects under varying degrees of stress severity showed the presence of more than one region within the original QTL. The study found the presence of a donor allele at RM262 within qDTY 2.1 and RM24334 within qDTY 9.1 showing a negative effect on GY under drought, indicating the necessity of precise fine mapping of QTL regions before using them in marker-assisted selection (MAS). However, the presence of sub-QTLs together in close vicinity to each other provides a unique opportunity to breeders to introgress such regions together as a unit into high-yielding drought-susceptible varieties through MAS.
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However, the presence of sub-QTLs together in close vicinity to each other provides a unique opportunity to breeders to introgress such regions together as a unit into high-yielding drought-susceptible varieties through MAS.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer-Verlag</pub><pmid>22361948</pmid><doi>10.1007/s00122-012-1823-9</doi><tpages>15</tpages></addata></record>
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subjects Agriculture
Biochemistry
Biomedical and Life Sciences
Biotechnology
Chromosome mapping
Chromosomes
Crop yields
Drought
Droughts
Environmental aspects
Genetic aspects
Genetic Markers
India
Influence
Inheritance Patterns - genetics
Life Sciences
Lod Score
Morphology
Original Paper
Oryza - genetics
Oryza - growth & development
Oryza sativa
Phenotype
Philippines
Physical Chromosome Mapping - methods
Physiological aspects
Plant Biochemistry
Plant Breeding/Biotechnology
Plant Genetics and Genomics
Population Dynamics
Quantitative trait loci
Quantitative Trait Loci - genetics
Quantitative Trait, Heritable
Seeds - genetics
Seeds - growth & development
title Fine mapping of QTLs for rice grain yield under drought reveals sub-QTLs conferring a response to variable drought severities
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