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PLoS Genet. 2016 Dec 22;12(12):e1006433. doi: 10.1371/journal.pgen.1006433. eCollection 2016 Dec.

The Jujube Genome Provides Insights into Genome Evolution and the Domestication of Sweetness/Acidity Taste in Fruit Trees.

Author information

1
College of Forestry, Northwest A&F University, Yangling, China.
2
Center for Jujube Engineering and Technology of State Forestry Administration, Northwest A&F University, Yangling, China.
3
Novogene Bioinformatics Institute, Beijing, China.
4
Boyce Thompson Institute, Cornell University, Ithaca, New York, United States of America.
5
College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China.
6
Plant Germplasm and Genomics Center, Germplasm Bank of Wild Species in Southwest China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.

Abstract

Jujube (Ziziphus jujuba Mill.) belongs to the Rhamnaceae family and is a popular fruit tree species with immense economic and nutritional value. Here, we report a draft genome of the dry jujube cultivar 'Junzao' and the genome resequencing of 31 geographically diverse accessions of cultivated and wild jujubes (Ziziphus jujuba var. spinosa). Comparative analysis revealed that the genome of 'Dongzao', a fresh jujube, was ~86.5 Mb larger than that of the 'Junzao', partially due to the recent insertions of transposable elements in the 'Dongzao' genome. We constructed eight proto-chromosomes of the common ancestor of Rhamnaceae and Rosaceae, two sister families in the order Rosales, and elucidated the evolutionary processes that have shaped the genome structures of modern jujubes. Population structure analysis revealed the complex genetic background of jujubes resulting from extensive hybridizations between jujube and its wild relatives. Notably, several key genes that control fruit organic acid metabolism and sugar content were identified in the selective sweep regions. We also identified S-locus genes controlling gametophytic self-incompatibility and investigated haplotype patterns of the S locus in the jujube genomes, which would provide a guideline for parent selection for jujube crossbreeding. This study provides valuable genomic resources for jujube improvement, and offers insights into jujube genome evolution and its population structure and domestication.

PMID:
28005948
PMCID:
PMC5179053
DOI:
10.1371/journal.pgen.1006433
[Indexed for MEDLINE]
Free PMC Article

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