@article{29887d5f178a462dae738ada82c8f07f,
title = "Re-exploration of U's Triangle Brassica Species Based on Chloroplast Genomes and 45S nrDNA Sequences",
abstract = "The concept of U's triangle, which revealed the importance of polyploidization in plant genome evolution, described natural allopolyploidization events in Brassica using three diploids [B. rapa (A genome), B. nigra (B), and B. oleracea (C)] and derived allotetraploids [B. juncea (AB genome), B. napus (AC), and B. carinata (BC)]. However, comprehensive understanding of Brassica genome evolution has not been fully achieved. Here, we performed low-coverage (2-6×) whole-genome sequencing of 28 accessions of Brassica as well as of Raphanus sativus [R genome] to explore the evolution of six Brassica species based on chloroplast genome and ribosomal DNA variations. Our phylogenomic analyses led to two main conclusions. (1) Intra-species-level chloroplast genome variations are low in the three allotetraploids (2∼7 SNPs), but rich and variable in each diploid species (7∼193 SNPs). (2) Three allotetraploids maintain two 45SnrDNA types derived from both ancestral species with maternal dominance. Furthermore, this study sheds light on the maternal origin of the AC chloroplast genome. Overall, this study clarifies the genetic relationships of U's triangle species based on a comprehensive genomics approach and provides important genomic resources for correlative and evolutionary studies.",
author = "Kim, {Chang Kug} and Seol, {Young Joo} and Sampath Perumal and Jonghoon Lee and Waminal, {Nomar Espinosa} and Murukarthick Jayakodi and Lee, {Sang Choon} and Seungwoo Jin and Choi, {Beom Soon} and Yeisoo Yu and Ko, {Ho Cheol} and Choi, {Ji Weon} and Ryu, {Kyoung Yul} and Sohn, {Seong Han} and Isobel Parkin and Yang, {Tae Jin}",
note = "Funding Information: This study was conducted with support from the Research Program for Agricultural Science and Technology Development (Project no. PJ010112) of the NAAS, and from the Cooperative Research Program for Agriculture Science & Technology Development (SSAC, Grant no. PJ011650), RDA, Republic of Korea. This work was also partially supported by a Golden Seed Project (Center for Horticultural Seed Development, No. 213003- 04-4-SB430), Ministry of Agriculture, Food and Rural Affairs (MAFRA), Cooperative Research Program for Agriculture Science & Technology Development (Project No. PJ01100801), Rural Development Administration, Republic of Korea. The funding body has no role in the design of the study, analysis, and writing the manuscript. Funding Information: This study was conducted with support from the Research Program for Agricultural Science and Technology Development (Project no. PJ010112) of the NAAS, and from the Cooperative Research Program for Agriculture Science & Technology Development (SSAC, Grant no. PJ011650), RDA, Republic of Korea. This work was also partially supported by a Golden Seed Project (Center for Horticultural Seed Development, No. 213003-04-4-SB430), Ministry of Agriculture, Food and Rural Affairs (MAFRA), Cooperative Research Program for Agriculture Science & Technology Development (Project No. PJ01100801), Rural Development Administration, Republic of Korea. The funding body has no role in the design of the study, analysis, and writing the manuscript.",
year = "2018",
month = dec,
day = "1",
doi = "10.1038/s41598-018-25585-4",
language = "English (US)",
volume = "8",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",
number = "1",
}