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

ABSTRACT: 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.

SUBMITTER: Rosas U

PROVIDER: S-EPMC3773737 | biostudies-literature | 2013 Sep

REPOSITORIES: biostudies-literature

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

Rosas Ulises U Cibrian-Jaramillo Angelica A Ristova Daniela D Banta Joshua A JA Gifford Miriam L ML Fan Angela Huihui AH Zhou Royce W RW Kim Grace Jaeyoon GJ Krouk Gabriel G Birnbaum Kenneth D KD Purugganan Michael D MD Coruzzi Gloria M GM

Proceedings of the National Academy of Sciences of the United States of America 20130826 37

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 t ...[more]

PMID: 23980140

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

Publications

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

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