Unraveling the complex trait of harvest index with association mapping in rice (Oryza sativa L.)

Harvest index is a measure of success in partitioning assimilated photosynthate. An improvement of harvest index means an increase in the economic portion of the plant. Our objective was to identify genetic markers associated with harvest index traits using 203 O. sativa accessions. The phenotyping...

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Veröffentlicht in:PloS one 2012-01, Vol.7 (1), p.e29350-e29350
Hauptverfasser: Li, Xiaobai, Yan, Wengui, Agrama, Hesham, Jia, Limeng, Jackson, Aaron, Moldenhauer, Karen, Yeater, Kathleen, McClung, Anna, Wu, Dianxing
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creator Li, Xiaobai
Yan, Wengui
Agrama, Hesham
Jia, Limeng
Jackson, Aaron
Moldenhauer, Karen
Yeater, Kathleen
McClung, Anna
Wu, Dianxing
description Harvest index is a measure of success in partitioning assimilated photosynthate. An improvement of harvest index means an increase in the economic portion of the plant. Our objective was to identify genetic markers associated with harvest index traits using 203 O. sativa accessions. The phenotyping for 14 traits was conducted in both temperate (Arkansas) and subtropical (Texas) climates and the genotyping used 154 SSRs and an indel marker. Heading, plant height and weight, and panicle length had negative correlations, while seed set and grain weight/panicle had positive correlations with harvest index across both locations. Subsequent genetic diversity and population structure analyses identified five groups in this collection, which corresponded to their geographic origins. Model comparisons revealed that different dimensions of principal components analysis (PCA) affected harvest index traits for mapping accuracy, and kinship did not help. In total, 36 markers in Arkansas and 28 markers in Texas were identified to be significantly associated with harvest index traits. Seven and two markers were consistently associated with two or more harvest index correlated traits in Arkansas and Texas, respectively. Additionally, four markers were constitutively identified at both locations, while 32 and 24 markers were identified specifically in Arkansas and Texas, respectively. Allelic analysis of four constitutive markers demonstrated that allele 253 bp of RM431 had significantly greater effect on decreasing plant height, and 390 bp of RM24011 had the greatest effect on decreasing panicle length across both locations. Many of these identified markers are located either nearby or flanking the regions where the QTLs for harvest index have been reported. Thus, the results from this association mapping study complement and enrich the information from linkage-based QTL studies and will be the basis for improving harvest index directly and indirectly in rice.
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An improvement of harvest index means an increase in the economic portion of the plant. Our objective was to identify genetic markers associated with harvest index traits using 203 O. sativa accessions. The phenotyping for 14 traits was conducted in both temperate (Arkansas) and subtropical (Texas) climates and the genotyping used 154 SSRs and an indel marker. Heading, plant height and weight, and panicle length had negative correlations, while seed set and grain weight/panicle had positive correlations with harvest index across both locations. Subsequent genetic diversity and population structure analyses identified five groups in this collection, which corresponded to their geographic origins. Model comparisons revealed that different dimensions of principal components analysis (PCA) affected harvest index traits for mapping accuracy, and kinship did not help. 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An improvement of harvest index means an increase in the economic portion of the plant. Our objective was to identify genetic markers associated with harvest index traits using 203 O. sativa accessions. The phenotyping for 14 traits was conducted in both temperate (Arkansas) and subtropical (Texas) climates and the genotyping used 154 SSRs and an indel marker. Heading, plant height and weight, and panicle length had negative correlations, while seed set and grain weight/panicle had positive correlations with harvest index across both locations. Subsequent genetic diversity and population structure analyses identified five groups in this collection, which corresponded to their geographic origins. Model comparisons revealed that different dimensions of principal components analysis (PCA) affected harvest index traits for mapping accuracy, and kinship did not help. In total, 36 markers in Arkansas and 28 markers in Texas were identified to be significantly associated with harvest index traits. Seven and two markers were consistently associated with two or more harvest index correlated traits in Arkansas and Texas, respectively. Additionally, four markers were constitutively identified at both locations, while 32 and 24 markers were identified specifically in Arkansas and Texas, respectively. Allelic analysis of four constitutive markers demonstrated that allele 253 bp of RM431 had significantly greater effect on decreasing plant height, and 390 bp of RM24011 had the greatest effect on decreasing panicle length across both locations. Many of these identified markers are located either nearby or flanking the regions where the QTLs for harvest index have been reported. Thus, the results from this association mapping study complement and enrich the information from linkage-based QTL studies and will be the basis for improving harvest index directly and indirectly in rice.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>22291889</pmid><doi>10.1371/journal.pone.0029350</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record>
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subjects Agricultural production
Agriculture
Agriculture - methods
alleles
Analysis
Arkansas
Biology
Biomass
Bumpers, Dale L
chromosome mapping
Chromosome Mapping - methods
Climate
Correlation
Cultivars
Efficiency - physiology
Gene mapping
Genetic aspects
Genetic Association Studies
Genetic diversity
Genetic markers
Genetic Markers - genetics
Genetic Markers - physiology
genetic variation
Genotype
Genotyping
Geography
Germplasm
Grain
Harvest
harvest index
heading
inflorescences
kinship
Mapping
Markers
microsatellite repeats
Models, Genetic
Multivariate analysis
Oryza - genetics
Oryza sativa
Phenotype
Phenotyping
Photosynthesis
Phylogeny
plants
Population
Population genetics
Population structure
principal component analysis
Principal components analysis
provenance
Quantitative genetics
Quantitative trait loci
Quantitative Trait Loci - genetics
Quantitative Trait Loci - physiology
Rice
Seed set
Seeds - genetics
Sorghum
Subtropical climates
subtropics
Taxonomy
temperate zones
Texas
title Unraveling the complex trait of harvest index with association mapping in rice (Oryza sativa L.)
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