Integration of responses within and across Arabidopsis natural accessions uncovers loci controlling root systems architecture

Phenotypic plasticity is presumed to be involved in adaptive change toward species diversification. We thus examined how candidate genes underlying natural variation across populations might also mediate plasticity within an individual. Our implementation of an integrative "plasticity space&quo...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2013-09, Vol.110 (37), p.15133-15138
Main Authors: Rosas, Ulises, Cibrian-Jaramillo, Angelica, Ristova, Daniela, Banta, Joshua A., Gifford, Miriam L., Fan, Angela Huihui, Zhou, Royce W., Kim, Grace Jaeyoon, Krouk, Gabriel, Birnbaum, Kenneth D., Purugganan, Michael D., Coruzzi, Gloria M.
Format: Article
Language:English
Subjects:
Adaptation, Physiological
Alleles
Allometry
Arabidopsis
Arabidopsis - anatomy & histology
Arabidopsis - genetics
Arabidopsis - physiology
Arabidopsis Proteins
Arabidopsis Proteins - genetics
Architecture
Biological Evolution
Biological Sciences
Datasets
Evolution
Flowers & plants
Genes
Genes, Plant
Genetic Variation
Genome-Wide Association Study
Genomics
Genotype & phenotype
Life Sciences
Mutation
Phenotype
Phenotypes
Phenotypic plasticity
Plant Roots
Plant Roots - anatomy & histology
Plant Roots - physiology
Plants
Polymorphism, Single Nucleotide
Root systems
Vegetal Biology
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Summary:Phenotypic plasticity is presumed to be involved in adaptive change toward species diversification. We thus examined how candidate genes underlying natural variation across populations might also mediate plasticity within an individual. Our implementation of an integrative "plasticity space" approach revealed that the root plasticity of a single Arabidopsis accession exposed to distinct environments broadly recapitulates the natural variation "space." Genome-wide association mapping identified the known gene PHOSPHATE 1 (PHO1) and other genes such as Root System Architecture 1 (RSA1) associated with differences in root allometry, a highly plastic trait capturing the distribution of lateral roots along the primary axis. The response of mutants in the Columbia-0 background suggests their involvement in signaling key modulators of root development including auxin, abscisic acid, and nitrate. Moreover, genotype-by-environment interactions for the PHO1 and RSA1 genes in Columbia-0 phenocopy the root allometry of other natural variants. This finding supports a role for plasticity responses in phenotypic evolution in natural environments.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.1305883110