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Insight to the ancestral relations and varietal diversity of Indian tea [ Camellia sinensis (L.) Kuntze] through plastid and nuclear phylogenetic markers
Genetic Resources and Crop Evolution ( IF 2 ) Pub Date : 2020-09-30 , DOI: 10.1007/s10722-020-01022-2
Anjan Hazra , Pradosh Mahadani , Subhanwita Das , Senjuti Bhattacharya , Rakesh Kumar , Chandan Sengupta , Sauren Das

Traces of genetic introgression from wild donors that occurred during the origin trajectory of a crop would be concealed in the existing gene pool of its cultivated varieties. Dissection of signature motifs from wild relatives and diverse genotypes of a crop, not only can elucidate the probable ancestry but also offer a potential tool to authenticate varieties with a particular phenotype. We selected twenty-two distinct genotypes representing diverse commercial tea germplasms of both assamica and sinensis lineage to trace genetic signatures of their wild ancestors. A total of 176 sequences were generated from eight coding and non-coding loci belonging to both plastid and nuclear genome of the commercial tea accessions and compared with corresponding homologous loci from various wild Camellia species. The concatenated multi-locus tree of the selected cultivars and the allied species was constructed to examine phylogenetic relatedness among and within the species. Present study uncovered several signature motifs that carry evidence of multiple hybridization events during the origin trajectory of the cultivated tea plant. Identified genotype-specific indels of chloroplast and nuclear non-coding regions might imitate their varietal origin.



中文翻译:

通过质体和核系统发生标记了解印度茶[山茶(Camellia sinensis(L.)Kuntze)]的祖先关系和品种多样性

在农作物的起源轨迹中发生的来自野生供体的基因渗入痕迹将被隐藏在其栽培品种的现有基因库中。从野生近缘种和农作物的不同基因型中分离出特征性基序,不仅可以阐明可能的血统,而且还提供了鉴定具有特定表型的品种的潜在工具。我们选择了22种不同的基因型,分别代表assamicasinensis谱系的各种商业茶种,以追踪其野生祖先的遗传特征。从属于商业茶种质体和核基因组的八个编码和非编码基因座中产生了总共176个序列,并与来自各种野生物种的相应同源基因座进行了比较。茶花种类。构建所选品种和相关物种的级联多位点树,以检查物种之间和内部的系统发育相关性。本研究发现了几个签名的图案,这些图案带有在栽培茶树起源轨迹期间发生多次杂交事件的证据。特定的基因型叶绿体和核非编码区插入/缺失可能会模仿其起源。

更新日期:2020-09-30
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