Environmental drivers and genomic architecture of trait differentiation in fire‐adapted Banksia attenuata ecotypes. Issue 4 (21st November 2018)

• Record Type: Journal Article
• Authors: He, Tianhua; Lamont, Byron B.; Enright, Neal J.; D'Agui, Haylee M.; Stock, William
• Is Part Of: Journal of integrative plant biology. Volume 61:Issue 4(2019)
• Page Start: 417
• Page End: 432
• Publication Date: 2018-11-21
• Subjects: Plants -- Periodicals; Plants -- China -- Periodicals; Electronic journals; 580.5
• DOI: 10.1111/jipb.12697
• Languages: English
• ISSNs: 1672-9072

Abstract

Abstract: Trait divergence between populations is considered an adaptive response to different environments, but to what extent this response is accompanied by genetic differentiation is less clear since it may be phenotypic plasticity. In this study, we analyzed phenotypic variation between two Banksia attenuata growth forms, lignotuberous (shrub) and epicormic resprouting (tree), in fire‐prone environments to identify the environmental factors that have driven this phenotypic divergence. We linked genotype with phenotype and traced candidate genes using differential gene expression analysis. Fire intervals determined the phenotypic divergence between growth forms in B. attenuata . A genome‐wide association study identified 69 single nucleotide polymorphisms, putatively associated with growth form, whereas no growth form‐ or phenotype‐specific genotypes were identified. Genomic differentiation between the two growth forms was low (Fst = 0.024). Differential gene expression analysis identified 37 genes/transcripts that were differentially expressed in the two growth forms. A small heat‐shock protein gene, associated with lignotuber presence, was differentially expressed in the two forms. We conclude that different fire regimes induce phenotypic polymorphism in B. attenuata, whereas phenotypic trait divergence involves the differential expression of a small fraction of genes that interact strongly with the disturbance regime. Thus, phenotypic plasticity among resprouters is the general strategy for surviving varying fire regimes. Abstract : Banksia attenuata has tree and shrub growth forms in ecosystems with frequent fire as an ecological disturbance in southwestern Australia. The divergence in growth form is determined by fire frequency in their habitats and by the differential expression of a small number of genes that interact with the disturbance regime.