Navigation Links
The genome of mesopolyploid crop Brassica rapa sheds new light on the study of genome evolution
Date:8/28/2011

August 29, 2011, Shenzhen, China The Institute of Vegetables and Flowers Chinese Academy of Agricultural Science, Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, and BGI, the world's largest genomics organization, announced today that they were among the research organizations comprising the Brassica rapa Genome Sequencing Project Consortium (BrGSPC) that completed the genome sequence and analysis of the mesopolyploid crop B. rapa, a Chinese cabbage. The findings are published online today in Nature Genetics. This study marks a significant milestone in Brassica crops genome research, providing a new important resource for studying the evolutionary history of polyploid genomes and opening a brand way for the genetic improvement of Brassica oil and vegetable crops.

Brassica crops are used for human nutrition and provide opportunities for the study of genome evolution. These crops include important vegetables (B. rapa, Brassica oleracea) as well as oilseed crops (Brassica napus, B. rapa, Brassica juncea and Brassica carinata), which contribute to approximately 10% of the world's vegetable crop produce and approximately 12% of the worldwide edible oil supplies. The species B. rapa is a major vegetable or oil crop in Asia and Europe. It also serves as an excellent model system to study polyploidy-related genome evolution because of its paleohexaploid ancestry and its close evolutionary relationships with Arabidopsis thaliana and other Brassica species with larger genomes.

Since the Brassica rapa Genome Sequencing Project (BrGSP) was initiated about three years ago, scientists from China, United Kingdom, USA, Korea, Canada, France and Australia have been working on the studies of B. rapa genome, aiming to assist botanists and breeders worldwide in improving production, quality, nutritional value and disease resistance of B. rapa varieties. In this project, Chinese Scientists have been playing a leading role by the advanced next-generation sequencing technology. In 2009, BrGSPC terminated all the sequencing plans and took the B. rapa genome sequenced by Chinese Scientists as B. rapa (Chinese cabbage) reference sequence.

With the advanced genome sequencing capability of BGI, B. rapa was sequenced and assembled by BGI's Short Oligonucleotide Analysis Package, SOAPdenovo. The assembled Brassica rapa genome size was approximately 283.8 Mb, which was estimated to cover >98% of the gene space. After the annotation and analysis, 41,174 protein-coding genes were identified in B. rapa genome. So far, B. rapa is the closest sequenced species relatives to A. thaliana, and they show high similarity in functional genes, although they have undergone differentiation about 13 ~ 17 million years ago. The B. rapa genome sequence could lays an important foundation for better exploring structural and functional evolution of A. thaliana and other Brassica species.

The Brassica mesohexaploidy also offers an opportunity to study gene retention in triplicated genomes. In particular, variation in the number of members of gene families present in the genome may contribute to the remarkable morphological plasticity of Brassica species. Some auxin- related genes families also were expanded or some genes over retained, which may contribute to the evolution and development of morphological variants. In this study, the researchers also found that the genes associated with response to important environmental factors including salt, cold, osmotic stress, light, wounding, pathogen (broad spectrum) defense, and both cadmium and zinc ions, were evidently over retained. It suggested that genome triplication may have expanded gene families that underlie environmental adaptability as observed in other polyploid species.


'/>"/>

Contact: Liu Jia
liujia@genomics.cn
342-874-8918
Beijing Genomics Institute
Source:Eurekalert

Related biology news :

1. NC State researchers get to root of parasite genome
2. Worm genome offers clues to evolution of parasitism
3. Complete Genomics launches, becomes worlds first large-scale human genome sequencing company
4. Diatom genome helps explain success in trapping excess carbon in oceans
5. Washington University scientists first to sequence genome of cancer patient
6. Research consortium to sequence turkey genome
7. DOE Joint Genome Institute completes soybean genome
8. Breast cancer genome shows evolution, instability of cancer
9. In lung cancer, silencing one crucial gene disrupts normal functioning of genome
10. Gene switch sites found mainly on shores, not just islands of the human genome
11. Genome Medicine: Bridging the gap between research and clinical practice
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/22/2016)... Md. , June 22, 2016  The American College ... Trade Show Executive Magazine as one of the ... on May 25-27 at the Bellagio in Las ... on the highest percentage of growth in each of the ... of exhibiting companies and number of attendees. The 2015 ACMG ...
(Date:6/16/2016)... SAN FRANCISCO , June 16, 2016 /PRNewswire/ ... Market size is expected to reach USD ... report by Grand View Research, Inc. Technological proliferation ... and banking applications are expected to drive the ... ) , The development of ...
(Date:6/3/2016)... 3, 2016 Das ... Nepal hat ein 44 ... geprägter Kennzeichen, einschließlich Personalisierung, Registrierung und IT-Infrastruktur, ... Produktion und Implementierung von Identitätsmanagementlösungen. Zahlreiche renommierte ... Januar teilgenommen, aber Decatur wurde als konformste ...
Breaking Biology News(10 mins):
(Date:6/24/2016)... TOKYO , June 24, 2016  Regular discussions on ... to take place between the two entities said Poloz. ... in Ottawa , he pointed to the ... and the federal government. ... Poloz said, "Both institutions have common economic goals, why not ...
(Date:6/23/2016)... WI (PRWEB) , ... June 23, 2016 , ... ... supplements, is pleased to announce the launch of their brand, UP4™ Probiotics, into ... for over 35 years, is proud to add Target to its list of ...
(Date:6/23/2016)... ... June 23, 2016 , ... Charm Sciences, Inc. is ... has received AOAC Research Institute approval 061601. , “This is another AOAC-RI approval ... Bob Salter, Vice President of Regulatory and Industrial Affairs. “The Peel Plate methods ...
(Date:6/23/2016)... OTTAWA, ON (PRWEB) , ... June 23, 2016 , ... ... former DNA Technical Leader at the Arkansas State Crime Laboratory, has joined STACS DNA ... joining the STACS DNA team,” said Jocelyn Tremblay, President and COO of STACS DNA. ...
Breaking Biology Technology: