scholarly journals Genome-wide association mapping of date palm fruit traits

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Khaled M. Hazzouri ◽  
Muriel Gros-Balthazard ◽  
Jonathan M. Flowers ◽  
Dario Copetti ◽  
Alain Lemansour ◽  
...  
Keyword(s):  
Association Studies ◽  
Fruit Color ◽  
Genome Wide Association ◽  
Genome Wide Association Studies ◽  
Fruit Traits ◽  
Sugar Composition ◽  
Palm Fruit ◽  
Date Palms ◽  
Evolutionary Diversification ◽  
Genome Wide

Abstract Date palms (Phoenix dactylifera) are an important fruit crop of arid regions of the Middle East and North Africa. Despite its importance, few genomic resources exist for date palms, hampering evolutionary genomic studies of this perennial species. Here we report an improved long-read genome assembly for P. dactylifera that is 772.3 Mb in length, with contig N50 of 897.2 Kb, and use this to perform genome-wide association studies (GWAS) of the sex determining region and 21 fruit traits. We find a fruit color GWAS at the R2R3-MYB transcription factor VIRESCENS gene and identify functional alleles that include a retrotransposon insertion and start codon mutation. We also find a GWAS peak for sugar composition spanning deletion polymorphisms in multiple linked invertase genes. MYB transcription factors and invertase are implicated in fruit color and sugar composition in other crops, demonstrating the importance of parallel evolution in the evolutionary diversification of domesticated species.

scholarly journals Genome-wide association studies provide insights into the genetic determination of fruit traits of pear

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ming-Yue Zhang ◽  
Cheng Xue ◽  
Hongju Hu ◽  
Jiaming Li ◽  
Yongsong Xue ◽  
...  
Keyword(s):  
Fruit Quality ◽  
Molecular Breeding ◽  
Association Studies ◽  
Genome Wide Association ◽  
Genome Wide Association Studies ◽  
Quality Traits ◽  
Fruit Traits ◽  
Stone Cell ◽  
Genome Wide ◽  
Fruit Quality Traits

AbstractPear is a major fruit tree crop distributed worldwide, yet its breeding is a very time-consuming process. To facilitate molecular breeding and gene identification, here we have performed genome-wide association studies (GWAS) on eleven fruit traits. We identify 37 loci associated with eight fruit quality traits and five loci associated with three fruit phenological traits. Scans for selective sweeps indicate that traits including fruit stone cell content, organic acid and sugar contents might have been under continuous selection during breeding improvement. One candidate gene, PbrSTONE, identified in GWAS, has been functionally verified to be involved in the regulation of stone cell formation, one of the most important fruit quality traits in pear. Our study provides insights into the complex fruit related biology and identifies genes controlling important traits in pear through GWAS, which extends the genetic resources and basis for facilitating molecular breeding in perennial trees.

scholarly journals Genome‐Wide Association Studies in Apple Reveal Loci for Aroma Volatiles, Sugar Composition, and Harvest Date

2019 ◽  
Vol 12 (2) ◽  
pp. 180104 ◽  
Author(s):  
Bjarne Larsen ◽  
Zoë Migicovsky ◽  
Anne Aae Jeppesen ◽  
Kyle M. Gardner ◽  
Torben Bo Toldam‐Andersen ◽  
...  
Keyword(s):  
Association Studies ◽  
Harvest Date ◽  
Genome Wide Association ◽  
Genome Wide Association Studies ◽  
Sugar Composition ◽  
Aroma Volatiles ◽  
Genome Wide
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