AI Article Synopsis

  • In a study aimed at understanding flowering time (FL) adaptation in flax, researchers conducted a genome-wide association study (GWAS) on 200 flax plant accessions across four different environments.
  • They identified 40 quantitative trait nucleotides (QTNs) related to FL, which were associated with 27 quantitative trait loci (QTL), revealing that genetic factors affect flowering time primarily through additive gene actions.
  • The analysis highlighted nine significant QTL that influence FL in multiple environments and pointed towards candidate genes, suggesting that these genes may play roles in key developmental processes like transitioning from vegetative to reproductive phases and flower development.

Article Abstract

In a rapidly changing climate, flowering time (FL) adaptation is important to maximize seed yield in flax (Linum usitatissimum L.). However, our understanding of the genetic mechanism underlying FL in this multipurpose crop remains limited. With the aim of dissecting the genetic architecture of FL in flax, a genome-wide association study (GWAS) was performed on 200 accessions of the flax core collection evaluated in four environments. Two single-locus and six multi-locus models were applied using 70,935 curated single nucleotide polymorphism (SNP) markers. A total of 40 quantitative trait nucleotides (QTNs) associated with 27 quantitative trait loci (QTL) were identified in at least two environments. The number of QTL with positive-effect alleles in accessions was significantly correlated with FL (r = 0.77 to 0.82), indicating principally additive gene actions. Nine QTL were significant in at least three of the four environments accounting for 3.06-14.71% of FL variation. These stable QTL spanned regions that harbored 27 Arabidopsis thaliana and Oryza sativa FL-related orthologous genes including FLOWERING LOCUS T (Lus10013532), FLOWERING LOCUS D (Lus10028817), transcriptional regulator SUPERMAN (Lus10021215), and gibberellin 2-beta-dioxygenase 2 (Lus10037816). In silico gene expression analysis of the 27 FL candidate gene orthologous suggested that they might play roles in the transition from vegetative to reproductive phase, flower development and fertilization. Our results provide new insights into the QTL architecture of flowering time in flax, identify potential candidate genes for further studies, and demonstrate the effectiveness of combining different GWAS models for the genetic dissection of complex traits.

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Source
http://dx.doi.org/10.1007/s00438-021-01785-yDOI Listing

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