Navigation Links
Chinese scientists successfully crack the genome of diploid cotton
Date:8/28/2012

August 28, 2012, Shenzhen, China The international research team led by Chinese Academy of Agricultural Sciences and BGI have completed the genome sequence and analysis of a diploid cotton-- Gossypium raimondii. The cotton genome provides an invaluable resource for the study and genetic improvement of cotton quality and output, and sheds new lights on understanding the genetic characteristics and evolutionary mechanism underlying cotton and its close relatives. The study was published online in Nature Genetics. (http://www.nature.com/ng/journal/vaop/ncurrent/full/ng.2371.html).

Cotton, also known as "white gold", is an important cash crop worldwide. Its fiber is one of the oldest fibers under human cultivation, which traces over 7,000 years old recovered from archaeological sites. The cotton production provides income for approximately 100 million families, and approximately 150 countries are involved in cotton import and export. Additionally, in scientific research, cotton also serves as an excellent model system for studying polyploidization, cell elongation and cell wall biosynthesis.

In this study, researchers sequenced the genome of G. raimondii by the next-generation sequencing technology, yielding a draft cotton genome with 103.6-fold genome coverage. Over 73% of the assembled sequences were anchored on 13 G. raimondii chromosomes. They identified 2,355 syntenic blocks in the G. raimondii genome, and found that approximately 40% of the paralogous genes were present in more than 1 block, which suggests that this cotton genome has undergone substantial chromosome rearrangement during its evolution.

Through comprehensive comparison and analysis, researchers observed that one paleohexaploidization event occurred in the G. raimondii genome at approximately 130.8 million years ago, while the event is commonly found in eudicots. They also found the evidence to support a cottonspecific wholegenome duplication event occurred at approximately 13-20 million years ago.

Cotton is known to produce a unique group of terpenoids such as gossypol. The accumulated gossypol and related sesquiterpenoids produced by cotton in pigment glands can be as a resistance against pathogens and herbivores. The majority of cotton sesquiterpenoids are derived from a common precursor which is synthesized by (+)- δ -cadinene synthase (CDN) in gossypol biosynthesis. Through the phylogenetic analysis on G. raimondii and eight other sequenced plant genomes, they found that the cotton, and probably Theobroma cacao, were the only sequenced plant species that possess an authentic CDN1 gene family for gossypol biosynthesis.

Furthermore, the transcriptomic comparison between the fiber-bearing G. hirsutum and the non-fibered G. raimondii demonstrated that three synthases are important for cotton fiber development, including sucrose synthase (Sus), 3-ketoacyl-CoA synthase (KCS) and 1-aminocyclopropane-1-carboxylic acid oxidase (ACO). Meanwhile, the MYB and bHLH transcription factors preferentially expressed in fiber may be useful to explain the molecular mechanisms that are in charge of governing fiber initiation and early cell growth.

Zhiwen Wang, Project Manager at BGI, said, "The completed G. raimondii genome provides a good reference for accelerating the genomic research on tetraploid cotton species such as G. hirsutum and G. barbadense. It also will lay a solid foundation for researchers to further boost cotton quality and productivity by comprehensively exploring the genetic mechanisms underlying cotton fiber initiation, gossypol biosynthesis and resistance against pathogens and herbivores."


'/>"/>

Contact: Jia Liu
liujia@genomics.cn
BGI Shenzhen
Source:Eurekalert

Related biology news :

1. University of Leeds and Chinese Academy of Sciences join forces
2. Tongue analysis software uses ancient Chinese medicine to warn of disease
3. Scientists find oldest occurrence of arthropods preserved in amber
4. To cap or not to cap: Scientists find new RNA phenomenon that challenges dogma
5. MBL scientists discover nerves control iridescence in squid’s remarkable electric skin
6. Scientists identify new gene that influences survival in ALS
7. Northwestern scientists create chemical brain
8. Scientists quantify nanofiber health risk to workers
9. Scientists shed light on glowing materials
10. Triage for plants: NYBG scientists develop and test rapid species conservation assessment technique
11. Danger in the blood: U-M scientists show how antibiotic-resisting bacterial infections may form
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/9/2016)... Elevay is currently known as ... for high net worth professionals seeking travel for work ... world, there is still no substitute for a face-to-face ... your deal with a firm handshake. This is why ... of citizenship via investment programs like those offered by ...
(Date:4/28/2016)... April 28, 2016 First quarter 2016:   ... 966% compared with the first quarter of 2015 The ... 589.1 M (loss: 18.8) and the operating margin was 40% (-13) ... Cash flow from operations was SEK 249.9 M (21.2) ... guidance is unchanged, SEK 7,000-8,500 M. The operating margin ...
(Date:4/19/2016)... 20, 2016 The new GEZE ... compact web-based "all-in-one" system solution for all door components. ... or the door interface with integration authorization management system, ... systems. The minimal dimensions of the access control and ... building installations offer considerable freedom of design with regard ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... ... 23, 2016 , ... Charm Sciences, Inc. is pleased to ... AOAC Research Institute approval 061601. , “This is another AOAC-RI approval of the ... Vice President of Regulatory and Industrial Affairs. “The Peel Plate methods perform comparably ...
(Date:6/23/2016)... , ... June 23, 2016 , ... ... announced the launch of the Supplyframe Design Lab . Located in Pasadena, ... explore the future of how hardware projects are designed, built and brought to ...
(Date:6/23/2016)... BEACH, Calif. , June 23, 2016  Blueprint ... new biological discoveries to the medical community, has closed ... co-founder Matthew Nunez . "We have ... us with the capital we need to meet our ... will essentially provide us the runway to complete validation ...
(Date:6/23/2016)... , ... June 23, 2016 , ... ... quality, regulatory and technical consulting, provides a free webinar on Performing ... July 13, 2016 at 12pm CT at no charge. , Incomplete investigations are ...
Breaking Biology Technology: