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Dose-dependent interactions between two loci trigger altered shoot growth in BG-5 × Krotzenburg-0 (Kro-0) hybrids of Arabidopsis thaliana. | LitMetric

AI Article Synopsis

  • Hybrids of Arabidopsis thaliana can experience reduced fitness compared to their parent plants due to genetic interactions, with previous research mainly focusing on immune conflicts.
  • This study identifies a new hybrid incompatibility phenomenon in A. thaliana from a cross between two specific accessions, highlighting growth issues in F hybrids and linking them to changes in hormone levels and stem architecture.
  • The research discovered specific genetic loci related to these traits and demonstrated that increasing growth temperature could alleviate some of the hybrid growth problems, providing insights into the mechanisms behind hybrid incompatibility in plants.

Article Abstract

Hybrids occasionally exhibit genetic interactions resulting in reduced fitness in comparison to their parents. Studies of Arabidopsis thaliana have highlighted the role of immune conflicts, but less is known about the role of other factors in hybrid incompatibility in plants. Here, we present a new hybrid incompatibility phenomenon in this species. We have characterized a new case of F hybrid incompatibility from a cross between the A. thaliana accessions Krotzenburg-0 (Kro-0) and BG-5, by conducting transcript, metabolite and hormone analyses, and identified the causal loci through genetic mapping. The F hybrids showed arrested growth of the main stem, altered shoot architecture, and altered concentrations of hormones in comparison to parents. The F phenotype could be rescued in a developmental-stage-dependent manner by shifting to a higher growth temperature. These F phenotypes were linked to two loci, one on chromosome 2 and one on chromosome 3. The F generation segregated plants with more severe phenotypes which were linked to the same loci as those in the F . This study provides novel insights into how previously unknown mechanisms controlling shoot branching and stem growth can result in hybrid incompatibility.

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Source
http://dx.doi.org/10.1111/nph.14781DOI Listing

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