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:9/30/2014)... comes to using marijuana, new research, involving mice and ... Journal of Leukocyte Biology , suggests that ... you should. That,s because a team of Italian scientists ... serious long-term damage to the immune system. This damage ... such as multiple sclerosis, inflammatory bowel disease and rheumatoid ...
(Date:9/30/2014)... available in German . ... response to risky situations such as exposure to predators. ... found in a long-term study on different populations of ... rate and ambient temperature. High metabolic rates and low ... these scenarios birds were more likely to approach potential ...
(Date:9/30/2014)... -- Winners of The Economist,s prestigious Innovation awards 2014 ... place at the JW Marriott Hong Kong on Friday, October 10 ... their experiences and the lessons those hold for others. The awards, ... the past decade, will be presented at a ceremony in ... will be the first time the ceremony has come to ...
Breaking Biology News(10 mins):Adolescent exposure to thc may cause immune systems to go up in smoke 2Risky metabolism 2Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 2Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 3Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 4Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 5Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 6Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 7
... CSIRO and the Global Carbon Project, and Dr Michael ... of carbon dioxide (CO2) absorbed annually by the world,s ... worth hundreds of billions of dollars. However, concerns ... quantifying changes in the size of those stocks, and ...
... a remote British Columbia site is the first ever ... species, according to a recent examination by a University ... the Sustut Basin of north-central British Columbia 37 years ... old, were tucked away until being donated to Dalhousie ...
... may not rival the artistry of glassblowers in Europe ... Standards and Technology (NIST) and Cornell University have found ... creates nanoscale (billionth of a meter) fluidic devices used ... DNA strands. The novel method is described in a ...
Cached Biology News:Tropical forest sustainability: A climate change boon 2'Nanoglassblowing' seen as boon to study of individual molecules 2
(Date:9/30/2014)... 2014 Lyme Research Alliance ... disease research at universities, today announced the awarding of ... identification, treatment and cure for Lyme and other tick-borne ... most applications in its history—over 20 grant proposals—a 100 ... were pleased to receive so many solid applications from ...
(Date:9/30/2014)... On September 11, Pharma IQ conducted an ... of a session that he will lead on “Stem Cells” ... February 17-18, 2015 in London. In the interview posted ... Sherley to respond to several questions on the current state ... stem cell toxicity, and future trends in the use of ...
(Date:9/30/2014)... 30, 2014 Back in the 1970’s, many ... feet. per employee, which included space for circulation and file ... Jeff Howell, partner at Nidea Corporate Real Estate / ... “By the year 2000, however, 250 square feet per ... number come down to 175 to 225 square feet, and ...
(Date:9/29/2014)... forefront of diagnostics today, with imaging techniques like ... and NMR (nuclear magnetic resonance) increasing steeply over ... image resolution and quality still limit these techniques ... solution is hyperpolarization, which involves injecting the patient ... following the distribution and fate of specific molecules ...
Breaking Biology Technology:Lyme Research Alliance Awards Nearly $600,000 in New Grants 2Lyme Research Alliance Awards Nearly $600,000 in New Grants 3Lyme Research Alliance Awards Nearly $600,000 in New Grants 4Adult Stem Cell Technology Center, LLC Director James L. Sherley Discusses Stem Cell Toxicology 2Adult Stem Cell Technology Center, LLC Director James L. Sherley Discusses Stem Cell Toxicology 3Adult Stem Cell Technology Center, LLC Director James L. Sherley Discusses Stem Cell Toxicology 4ITRA Global Reports on How Companies Are Squeezing More Employees into Less Office Space 2ITRA Global Reports on How Companies Are Squeezing More Employees into Less Office Space 3A safer approach for diagnostic medical imaging 2A safer approach for diagnostic medical imaging 3
... thoughts, new processes, and new innovations, but the term The ... old worn-out phase used in Silicon Valley in the late ... corruption as well as cute, but not profitable or sustainable ... in a Real-Time Economy, in which some of Wisconsins businesses ...
... MILWAUKEE,WI.-Beware calling the next strange idea you hear strange: ... millionaire next door. , ,A panel of experienced ... Conference in Milwaukee last Wednesday have dealt with looks ... their brethren in the audience to accept the whispers ...
... different look and feel as traditionalists (b. 1925 1942) ... the workforce, by choice or not. Employers will be facing ... unfilled jobs combined with a shortage of young talent to ... educate, attract, grow and retain talent. Companies will be faced ...
Cached Biology Technology:Wisconsins Real-Time" Economy 2Wisconsins Real-Time" Economy 3Wisconsins Real-Time" Economy 4Lowering the fear factor for entrepreneurs, intra-preneurs 2Lowering the fear factor for entrepreneurs, intra-preneurs 3The ON* is on the Employer 2
...
...
... are predominantly used for labeling proteins, the ... peptides and nucleotides because they give better ... required in the conjugation processes. 5-TAMRA is ... peptides and proteins. 6-TAMRA is predominately used ...
Rabbit polyclonal to GPCR G2A ( Abpromise for all tested applications). entrezGeneID: 29933 SwissProtID: Q9UNW8...
Biology Products: