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Chlorosis caused by two recessively interacting genes reveals a role of RNA helicase in hybrid breakdown in Arabidopsis thaliana
Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany.
Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany.
Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany.
Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany.
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2017 (Engelska)Ingår i: The Plant Journal, ISSN 0960-7412, E-ISSN 1365-313X, Vol. 91, nr 2, s. 251-262Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Hybrids often differ in fitness from their parents. They may be superior, translating into hybrid vigour or heterosis, but they may also be markedly inferior, because of hybrid weakness or incompatibility. The underlying genetic causes for the latter can often be traced back to genes that evolve rapidly because of sexual or host-pathogen conflicts. Hybrid weakness may manifest itself only in later generations, in a phenomenon called hybrid breakdown. We have characterized a case of hybrid breakdown among two Arabidopsis thaliana accessions, Shahdara (Sha, Tajikistan) and Lövvik-5 (Lov-5, Northern Sweden). In addition to chlorosis, a fraction of the F2 plants have defects in leaf and embryo development, and reduced photosynthetic efficiency. Hybrid chlorosis is due to two major-effect loci, of which one, originating from Lov-5, appears to encode an RNA helicase (AtRH18). To examine the role of the chlorosis allele in the Lövvik area, in addition to eight accessions collected in 2009, we collected another 240 accessions from 15 collections sites, including Lövvik, from Northern Sweden in 2015. Genotyping revealed that Lövvik collection site is separated from the rest. Crosses between 109 accessions from this area and Sha revealed 85 cases of hybrid chlorosis, indicating that the chlorosis-causing allele is common in this area. These results suggest that hybrid breakdown alleles not only occur at rapidly evolving loci, but also at genes that code for conserved processes.

Ort, förlag, år, upplaga, sidor
2017. Vol. 91, nr 2, s. 251-262
Nyckelord [en]
Arabidopsis thaliana, Chlorosis, Hybrid breakdown, Local adaptation, RNA helicase
Nationell ämneskategori
Biologiska vetenskaper
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URN: urn:nbn:se:miun:diva-30991DOI: 10.1111/tpj.13560ISI: 000404795500006PubMedID: 28378460Scopus ID: 2-s2.0-85019677417OAI: oai:DiVA.org:miun-30991DiVA, id: diva2:1115091
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Version of record online: 30 May 2017

Tillgänglig från: 2017-06-26 Skapad: 2017-06-26 Senast uppdaterad: 2018-02-27Bibliografiskt granskad

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