Navigation Links
Molecular study could push back angiosperm origins
Date:3/15/2010

of land plants and the origin of vascular plants and seed plants," said Donoghue. "But we got a much older date for the origin of angiosperms one that's really out of whack with the fossil record," Smith added.

This disconnect between molecular and fossil estimates is not unheard of, the authors explained. "We see the same kind of discrepancy in other groups too, like mammals and birds," said Donoghue.

Why the mismatch between different approaches to dating the tree of life?

One possibility, the researchers explained, is that the first flowering plants weren't diverse or abundant enough to leave their mark in the fossil record. "We would expect there to be a time lag between the time of origin and when they became abundant enough to get fossilized," said Smith. "The debate would just be how long."

"Imagine a long fuse burning and then KABOOM! There's a big explosion. Maybe angiosperms were in that fuse state," said Donoghue. "But it's hard to imagine flowering plants would have had a big impact on the origin of major insect groups if that were the case," he added.

Another possibility, the researchers allow, is that the molecular methods may be amiss. "If the angiosperms originated 215 million years ago, then why don't we find them in the fossil record for almost 80 million years?" said Beaulieu. "It could also suggest that our dates are wrong."

"We've done the best analysis we know how to do with the current tools and information," said Donoghue. To improve on previous studies, the researchers used a method that allows for variable rates of evolution across the plant family tree. "Rates of molecular evolution in plants seem to be correlated with changes in life history," he explained. "Older methods assume that rates of molecular evolution don't change too radically from one branch of the evolutionary tree to another. But this newer method can accommodate some fairly major rate shifts." Although researchers h
'/>"/>

Contact: Robin Ann Smith
rsmith@nescent.org
919-668-4544
National Evolutionary Synthesis Center (NESCent)
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. U-M researchers solve a molecular mystery in muscle
2. 2010 Yeast Genetics and Molecular Biology Meeting
3. Transforming skin cells into stem cells using a molecular toolkit
4. Scientists discover molecular pathway for organ tissue regeneration and repair
5. Comprehensive study using bioinformatics predicts the molecular causes of many genetic diseases
6. Molecular Biometrics Closes $12.5 Million Series B Equity Funding
7. Discovery of a new molecular mechanism that guides visual nerves towards the brain
8. Nanodragster races toward the future of molecular machines
9. New research findings may help stop age-related macular degeneration at the molecular level
10. Molecular chaperone keeps bacterial proteins from slow-dancing to destruction
11. UCLA scientists find molecular switch to prevent Huntingtons disease in mice
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Molecular study could push back angiosperm origins
(Date:9/2/2014)... with the participation of the University of Granada has ... place in the Iberian Peninsula around the mid Holocene ... dust coming from the Sahara increased. The data came ... Alpine lake in Sierra Nevada (Granada) , This study, ... based on the sedimentation of atmospheric dust from the ...
(Date:9/2/2014)... ideal source of nutrition for infants and it ... evolution and civilizations of human beings. Unlike our ... of bacterial species, including some opportunistic pathogens of ... scientists and physicians. , Indeed, the existence of ... of co-evolutionary and co-adaptive interactions between the microbiome ...
(Date:9/2/2014)... 2014 A study published in the September ... American Academy of Child and Adolescent Psychiatry ... psychiatric diagnosis had an increased risk of developing ... Using data from the nationwide Danish registers, a ... Nielsen, Psychiatry, Aalborg University Hospital, Denmark, studied 48,299children ...
Breaking Biology News(10 mins):Scientists obtain new data on the weather 10,000 years ago from sediments of a lake in Sierra Nevada 2Are human breast milk microbiome 'neutral'? 2Are human breast milk microbiome 'neutral'? 3Risk of diabetes in children and adolescents exposed to antipsychotics 2
... blocks sperm. Evidence suggests that human male fertility ... and their receptors are present in the male reproductive ... there has been no genetic test to clarify mechanisms. ... issue, Sun et al. characterize the phenotype of mice ...
... a modest beneficial effect of anakinra for rheumatoid arthritis ... and its use with other biologic medications. Rheumatoid ... as one in 100 people worldwide. It affects the ... of a new breed of arthritis drugs licensed in ...
... who received a daily nutritional supplement for three months had a ... compared to children who did not receive the supplementation, according to ... Wasting (defined as a certain deviation that a child,s weight ... same height in a reference group) is characterized by the loss ...
Cached Biology News:February 2009 highlights from Biology of Reproduction 2Anakinra for rheumatoid arthritis: A modest benefit with some risk 2Nutritional supplementation program helps prevent weight loss among children in African country 2Nutritional supplementation program helps prevent weight loss among children in African country 3
(Date:9/2/2014)... , Sept. 2, 2014  Technology Applications International ... that its wholly-owned subsidiary Renuell Int,l, Inc. has signed ... and Space Administration ("NASA") at the Johnson Space Center ... See photos: tapplic.com/houstonphotos/ ... are very pleased to announce our latest, exclusive agreement ...
(Date:9/2/2014)... September 02, 2014 Opertech Bio, ... highly efficient, cost effective approach to sensory evaluation, ... 8,820,265 by the U.S. Patent and Trademark Office, ... , “Opertech’s taste evaluation technology called ... automated high throughput system for rapid characterization of ...
(Date:9/2/2014)... 2, 2014  Xencor, Inc. (NASDAQ: ... monoclonal antibodies for the treatment of autoimmune diseases, ... the appointment of Debra Zack , M.D., ... of Lloyd Rowland , senior vice president, ... "Debra,s expertise in biologics clinical development and ...
(Date:9/2/2014)...  Synthetic Biologics, Inc. (NYSE MKT: SYN), a ... targeting specific pathogens that cause serious infections and ... preclinical toxicology study of SYN-004. Per U.S. Food ... was required to move the Company,s lead anti-infective, ... effects of Clostridium difficile (C. difficile), ...
Breaking Biology Technology:Technology Applications International Corporation Subsidiary Enters Into Additional Exclusive Agreement with NASA at a Signing Ceremony at the Johnson Space Center In Houston, Texas 2Technology Applications International Corporation Subsidiary Enters Into Additional Exclusive Agreement with NASA at a Signing Ceremony at the Johnson Space Center In Houston, Texas 3Opertech Bio Receives U.S. Patent for High-Throughput Taste Evaluation Technology 2Xencor Appoints Debra Zack, M.D., Ph.D., Vice President, Clinical Development and Lloyd Rowland, Senior Vice President, Chief Compliance Officer and General Counsel 2Xencor Appoints Debra Zack, M.D., Ph.D., Vice President, Clinical Development and Lloyd Rowland, Senior Vice President, Chief Compliance Officer and General Counsel 3Synthetic Biologics to Initiate Clinical Trials of SYN-004 in 4Q 2014 to Prevent Potentially Deadly C. difficile Infections 2Synthetic Biologics to Initiate Clinical Trials of SYN-004 in 4Q 2014 to Prevent Potentially Deadly C. difficile Infections 3Synthetic Biologics to Initiate Clinical Trials of SYN-004 in 4Q 2014 to Prevent Potentially Deadly C. difficile Infections 4Synthetic Biologics to Initiate Clinical Trials of SYN-004 in 4Q 2014 to Prevent Potentially Deadly C. difficile Infections 5
... Guidance and Remains on Track for Four Product Launches ... 9:00 a.m. EDT EATONTOWN, N.J., April 30 Osteotech, ... the emerging field of biologic products for regenerative healing, ... 31, 2009."During the first quarter, we continued to make ...
... Accomplished regulatory executive enhances Nfocus device development team.PALO ALTO, ... Neuromedical Inc. announced today the appointment of accomplished ... the role of Vice President of Regulatory Affairs. "Bob ... experience to Nfocus , having served 18 of ...
... shows potential for pirfenidone role in treatment of patients with ... in HCV -- Strong data from 14-day triple combination study ... InterMune, Inc. (Nasdaq: ITMN ) today announced ... 2009. InterMune reported a net loss for ...
Cached Biology Technology:Osteotech Reports First Quarter 2009 Financial Results 2Osteotech Reports First Quarter 2009 Financial Results 3Osteotech Reports First Quarter 2009 Financial Results 4Osteotech Reports First Quarter 2009 Financial Results 5Osteotech Reports First Quarter 2009 Financial Results 6Osteotech Reports First Quarter 2009 Financial Results 7Osteotech Reports First Quarter 2009 Financial Results 8Nfocus Neuromedical Appoints Robert O'Holla to Head Regulatory 2InterMune Reports First Quarter 2009 Financial Results and Business Highlights 2InterMune Reports First Quarter 2009 Financial Results and Business Highlights 3InterMune Reports First Quarter 2009 Financial Results and Business Highlights 4InterMune Reports First Quarter 2009 Financial Results and Business Highlights 5InterMune Reports First Quarter 2009 Financial Results and Business Highlights 6InterMune Reports First Quarter 2009 Financial Results and Business Highlights 7InterMune Reports First Quarter 2009 Financial Results and Business Highlights 8InterMune Reports First Quarter 2009 Financial Results and Business Highlights 9InterMune Reports First Quarter 2009 Financial Results and Business Highlights 10InterMune Reports First Quarter 2009 Financial Results and Business Highlights 11InterMune Reports First Quarter 2009 Financial Results and Business Highlights 12InterMune Reports First Quarter 2009 Financial Results and Business Highlights 13
... QRT-PCR Mixes are formulated for use in ... SYBR Green. One-step QRT-PCR mixes offer a ... The pipetting steps are minimised, making the ... ,The 2x ABsolute QRT-PCR Mix is supplied ...
... of environmental and pathophysiological stressful conditions trigger ... known as heat shock proteins (HSPs), more ... The Hsp90 family of proteins in ... beta, Grp94, and Trap-1 (Hsp75). It was ...
... bespoke, cost-effective solutions for complex protein processing and production ... experience to help you develop a solution to your ... , do ... transfer all methodology to your own ...
... The Schleicher & Schuell BioScience Arraying ... dedicated to custom protein and nucleic ... project teams, comprised of R&D, Engineering, ... closely with collaborators every step of ...
Biology Products: