Navigation Links
Succulent plants waited for cool, dry Earth to make their mark
Date:5/3/2011

nt of Ecology and Evolutionary Biology at Brown and corresponding author on the paper.

The team then sifted through the literature on the timing of diversification in other succulents from regions around the globe. Succulents include aloes, the agaves of North America, the ice plants of South Africa and other lineages. Their comfort zone is in water-limited climates, and they have adapted physical characteristics to cope in those locales, such as shallow root systems, specialized water-storing tissue and exchanging gas at night, when it is cooler and less humid and so less water is lost. What struck the researchers was that all the succulent lineages, across habitats and continents, underwent major speciation between 5 and 10 million years ago, during roughly the same time period as the cacti.

C4 grasses, the tropical grasses that are now up to 20 percent of our planet's vegetative covering, burst onto the scene as well during this same window of time.

This must be more than a coincidence, the researchers thought. "It isn't overly surprising that most of the standing cactus diversity is relatively young. But when you put these species radiations in the context of all the other changes in plant communities that were happening at that very moment, all over the world, it begs some sort of global environmental driver," Edwards said.

The most plausible causes, the scientists thought, were a drying out of the planet and lowering of atmospheric carbon-dioxide levels. A wealth of research involving oxygen isotopes from a deep-sea organism showed the Earth underwent a drop in temperature, which the researchers believe led to reduced rainfall and increased aridity worldwide.

The carbon-dioxide link is more nuanced and controversial. The authors highlight one study that inferred atmospheric CO2 levels spiraled downward beginning roughly 15 million years ago. Combined with global cooling, "a drop in CO2 concentr
'/>"/>

Contact: Richard Lewis
Richard_Lewis@brown.edu
401-863-3766
Brown University
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. First rainforests arose when plants solved plumbing problem
2. Book looks at interrelationships among nitrogen, plants and the environment
3. Sweet chemistry: Carbohydrate adhesion gives stainless steel implants beneficial new functions
4. MSU lands $4.1 million grant to unlock plants biochemistry secrets
5. Discovery identifies elaborate G-protein network in plants
6. Ancestors of land plants revealed
7. Circadian rhythms spark plants ability to survive freezing weather
8. Shootingstars provide clues to likely response of plants to global warming
9. New genetic study helps to solve Darwins mystery about the ancient evolution of flowering plants
10. Are invasive plants a threat to native biodiversity? It depends on the spatial scale
11. If plants generate magnetic fields, theyre not sayin
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Succulent plants waited for cool, dry Earth to make their mark
(Date:10/17/2014)... To date, antidotes ... doctors are often limited to supportive therapy such as induced ... of drugs involved. So what can be done if a ... professor Jean-Christophe Leroux from the Institute of Pharmaceutical Sciences at ... "The task was to develop an agent that could eliminate ...
(Date:10/16/2014)... Washington land managers have a new synthesis of recent ... mixed-conifer (MMC) forests in the two states. , ... Eastern Oregon and Washington: A Synthesis of the Relevant ... general technical report published by the U.S. Forest Service,s ... a request from managers for a synthesis of the ...
(Date:10/16/2014)... Syncytial Virus causes severe respiratory tract infections and ... year. Scientists at VIB and Ghent University have ... counteract this common virus infection. , Xavier ... that paves the way for the development of ... virus that causes suffering in numerous small children ...
Breaking Biology News(10 mins):Emergency aid for overdoses 2Emergency aid for overdoses 3New report synthesizes best available science on management of moist mixed-conifer forests 2New perspectives for development of an RSV vaccine 2
... now receive early notice of outbreaks of toxic algae ... activities along the coast. Weekly bulletins generated by the ... on observations from state partners, coupled with models, imagery ... weather systems. "Early notification of blooms is essential, ...
... SAN ANTONIO While endogenous estrogen (i.e., estrogen produced ... well-known carcinogenic impact, hormone replacement therapy (HRT) utilizing estrogen ... reducing breast cancer risk, according to study results presented ... Symposium, held Dec. 8-12. "Our analysis suggests ...
... our understanding of human evolution have seen Walter and ... 2011 Gani Medal for Human Genetics by the Australian ... research in human genetics by early career researchers and ... Stephens Gani. Dr Oshlack, a senior research ...
Cached Biology News:Forecast system to warn of toxic algal outbreaks along Texas' shoreline 2Estrogen alone is effective for reducing breast cancer risk 2Genetic studies of human evolution win researcher 2011 Gani Medal 2
(Date:10/22/2014)... Diego, CA (PRWEB) October 22, 2014 ... balances from Sartorius, A & D Weighing, Rice ... Sartorius CPA Semi-Micro Balance . The Sartorius CPA ... for an affordable high-quality, precise, and user-friendly laboratory ... manufacturing of laboratory equipment, their laboratory balances are ...
(Date:10/22/2014)... VANCOUVER , Oct. 22, 2014 /PRNewswire/ - iCo ... ICOTF), today announced next steps for its Oral ... findings from its in vitro work ... therapy.  iCo now plans to complete pre clinical ... an initial Phase 1A clinical trial, utilizing approximately ...
(Date:10/20/2014)... 2014 Mapp Biopharmaceutical,s valiant effort to ... to fight the Ebola outbreak will make the ... production of pharmaceuticals can be, according to Kalorama ... while some may be taken aback by the ... industry knowledge are well aware of the complex ...
(Date:10/20/2014)... , Oct. 20, 2014  GenVec, Inc. (NASDAQ: ... P. Horovitz , Ph.D., from its board of directors effective ... in August 2003, and served as its chairman from June ... on the Nominating and Corporate Governance and Audit Committees of ... more than a decade of dedicated service to GenVec, and ...
Breaking Biology Technology:Pipette.com Launches the Addition of Sartorius CPA Semi-Micro Balance to Their Product Portfolio with Special Promotional Pricing 2Pipette.com Launches the Addition of Sartorius CPA Semi-Micro Balance to Their Product Portfolio with Special Promotional Pricing 3iCo Therapeutics Announces Advancement of Oral Amphotericin B Program 2iCo Therapeutics Announces Advancement of Oral Amphotericin B Program 3Kalorama: ZMapp Highlights Need For Faster Biopharmaceutical Production 2Kalorama: ZMapp Highlights Need For Faster Biopharmaceutical Production 3Zola P. Horovitz To Retire From GenVec Board 2
... Jointly Offer "Always on," Secure Solution For Mobile ... (Nasdaq:ADCT; www.adc.com ) and Network365 announced today a ... solution that helps generate additional revenue for mobile ... and trusted m-commerce transactions between operators, banks and ...
... a year in which Wisconsins real-time economy gained time ... news stories suggests the state is becoming a place where ... the champagne corks just yet: Wisconsin still has a long ... high-wage jobs as the state lost in the three-year manufacturing ...
... began requiring applicants to pay significant user fees when ... biologics. Such user fees have long been required for ... related to devices and biologics. In theory, user fees ... at what cost? User fees impose a significant financial ...
Cached Biology Technology:ADC and Network365 Team to Offer New End-to-End Mobile Payment System 2The (Tech) Economic Year in Review: Signs of Progress Amid Continuing Challenges 2The (Tech) Economic Year in Review: Signs of Progress Amid Continuing Challenges 3Fast Track: FDA User Fees: Do Faster Review Times Justify the Financial Burden? 2
... The Helios gene gun system, 220-240 V, ... biomaterials into cells. This handheld device employs ... RNA-, and other biomaterial-coated gold microcarriers from ... cartridge directly into target cells. This system ...
Mouse polyclonal antibody raised against a partial recombinant MHC2TA. NCBI Entrez Gene ID = 4261...
... Digital Sight DS-L2 imaging controller is a ... DS-L1, and allows users to comfortably observe, ... DS-L2 controller features an 8.4 inch LCD ... variety of Nikon cameras including the DS-Fi1 ...
Mouse monoclonal antibody to ST8SIA2 - ST8 alpha-N-acetyl-neuraminide alpha-2,8-sialyltransferase 2...
Biology Products: