Characterization of genome-wide genetic variations between two varieties of tea plant (Camellia sinensis) and development of InDel markers for genetic research.

Abstract:

BACKGROUND:Single nucleotide polymorphisms (SNPs) and insertions/deletions (InDels) are the major genetic variations and are distributed extensively across the whole plant genome. However, few studies of these variations have been conducted in the long-lived perennial tea plant. RESULTS:In this study, we investigated the genome-wide genetic variations between Camellia sinensis var. sinensis 'Shuchazao' and Camellia sinensis var. assamica 'Yunkang 10', identified 7,511,731 SNPs and 255,218 InDels based on their whole genome sequences, and we subsequently analyzed their distinct types and distribution patterns. A total of 48 InDel markers that yielded polymorphic and unambiguous fragments were developed when screening six tea cultivars. These markers were further deployed on 46 tea cultivars for transferability and genetic diversity analysis, exhibiting information with an average 4.02 of the number of alleles (Na) and 0.457 of polymorphism information content (PIC). The dendrogram showed that the phylogenetic relationships among these tea cultivars are highly consistent with their genetic backgrounds or original places. Interestingly, we observed that the catechin/caffeine contents between 'Shuchazao' and 'Yunkang 10' were significantly different, and a large number of SNPs/InDels were identified within catechin/caffeine biosynthesis-related genes. CONCLUSION:The identified genome-wide genetic variations and newly-developed InDel markers will provide a valuable resource for tea plant genetic and genomic studies, especially the SNPs/InDels within catechin/caffeine biosynthesis-related genes, which may serve as pivotal candidates for elucidating the molecular mechanism governing catechin/caffeine biosynthesis.

journal_name

BMC Genomics

journal_title

BMC genomics

authors

Liu S,An Y,Tong W,Qin X,Samarina L,Guo R,Xia X,Wei C

doi

10.1186/s12864-019-6347-0

subject

Has Abstract

pub_date

2019-12-05 00:00:00

pages

935

issue

1

issn

1471-2164

pii

10.1186/s12864-019-6347-0

journal_volume

20

pub_type

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