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:9/18/2014)... have developed a unique method to use microbes buried ... areas. , The first microbe-powered, self-sustaining wastewater treatment ... to clean up waste from large farming operations and ... Professor Haluk Beyenal and graduate student Timothy Ewing in ... system in the online edition of Journal of ...
(Date:9/18/2014)... that can operate inside the bore of an MRI ... biomedical research partnership program at Brigham and Women,s Hospital ... robot, in conjunction with real-time MRI images, can make ... less discomforting for the patient. The novel system also ... greater precision. , Developed by a team of robotics ...
(Date:9/18/2014)... acquire and creatively manipulate spoken language is unique to ... 6 million years of human evolution to make this ... candidate gene we now have," says Wolfgang Enard, Professor ... efforts to understand the molecular biological basis of language ... results of his latest study, undertaken in collaboration with ...
Breaking Biology News(10 mins):Researchers develop unique waste cleanup for rural areas 2Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 2Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 3Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 4Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 5Language evolution: Quicker on the uptake 2Language evolution: Quicker on the uptake 3
... University is proving its potential to impact global health. ... journal PLoS ONE , Rice alumnus Andrew Miller ... which costs $240, stacks up nicely against devices that ... of tuberculosis. Miller and colleagues at The Methodist ...
... not recognized as an animal until the 19th century, is ... have their genome sequenced. In a paper appearing in ... a team of researchers led by Daniel Rokhsar of the ... Genome Institute (JGI), report the draft genome sequence of the ...
... How well do you understand life in your own backyard? Cities ... aren,t visitors; they are an integral component, like trees in a ... the Earth,s people live in cities and the amount of paved ... Ohio, shouldn,t our sciences thrive in the city? Urban Ecosystem ...
Cached Biology News:Compact microscope a marvel 2Compact microscope a marvel 3Genome of ancient sponge reveals origins of first animals, cancer 2Genome of ancient sponge reveals origins of first animals, cancer 3Genome of ancient sponge reveals origins of first animals, cancer 4The real urban jungle 2
(Date:9/19/2014)... SAN DIEGO , Sept. 19, 2014 ... engaged in the development of high-value and difficult to ... will be presenting at the 21 st Annual ... New York . Bertrand Liang , chief ... the company,s development programs and business strategy on Friday, ...
(Date:9/19/2014)... 19, 2014 ... ) has announced the addition of the  "Micro ... to their offering.       (Logo: http://photos.prnewswire.com/prnh/20130307/600769) ... of the fastest-growing segments in the chromatography market. ... 2013, and expected to reach $2.0 billion by ...
(Date:9/18/2014)... (PRWEB) September 18, 2014 ... urological and interventional radiology products and services, announced ... as cryotherapy and cryoablation) versus external beam radiotherapy ... of the American Urological Association (MAAUA) Annual Meeting ... "Comparing Relative Effectiveness of Cryosurgery and External Beam ...
(Date:9/18/2014)... Sept. 18, 2014  Health Enhancement Products, Inc. (OTCQB: HEPI), ... algae bioactive compounds and metabolic processes, is pleased to announce ... of directors. Ms. Nola E. Masterson , a ... the board effective September 17, 2014. "We,re ... join our board," states Andrew Dahl , President and ...
Breaking Biology Technology:Pfenex to Present at Upcoming Industry Conference on September 26 2Micro Market Monitor : Global Pre-packed Chromatography Columns 2HealthTronics Announces Data Comparing Cryotherapy Versus Radiation for Treating Prostate Cancer Poster Presented at the American Urological Association Regional Meeting 2Health Enhancement Announces New Board Member In Advance Of Annual Shareholder Meeting 2
... SOMERSET, N.J., June 9 Alfacell Corporation,(Nasdaq: ACEL ... quarter,of fiscal 2008., The company recorded a net ... diluted common share, for the third fiscal quarter ended,April ... million, or $0.04,per basic and diluted common share, for ...
... Limited (LSE: SHP,Nasdaq: SHPGY), the global specialty biopharmaceutical ... lots of the ADHD patch DAYTRANA (lots,2750211 and ... DAYTRANA,patches do not meet their release liner removal ... have difficulties removing the,liners. This voluntary recall is ...
... 9 Amira Pharmaceuticals, a small,molecule pharmaceutical company ... treat inflammatory diseases, announced the hiring of Michael,V. ... Swanson has over 30 years of experience in ... in life sciences and specialty,pharmaceutical companies. Prior to ...
Cached Biology Technology:Alfacell Reports Financial Results for Third Quarter of Fiscal 2008 2Alfacell Reports Financial Results for Third Quarter of Fiscal 2008 3Alfacell Reports Financial Results for Third Quarter of Fiscal 2008 4Alfacell Reports Financial Results for Third Quarter of Fiscal 2008 5Alfacell Reports Financial Results for Third Quarter of Fiscal 2008 6Non-Safety-Related Voluntary Recall of a Limited Portion of DAYTRANA(TM) (Methylphenidate Transdermal System) Patches Announced 2Non-Safety-Related Voluntary Recall of a Limited Portion of DAYTRANA(TM) (Methylphenidate Transdermal System) Patches Announced 3Non-Safety-Related Voluntary Recall of a Limited Portion of DAYTRANA(TM) (Methylphenidate Transdermal System) Patches Announced 4Amira Pharmaceuticals Hires Industry Veteran for CFO Position 2
... system is used for single-color real-time detection ... or JOE fluorophores and features a real-time ... data from 96 wells, a gene expression ... analysis. The system includes the optical module ...
... Precision-designed for Optimal Microdissection , CapSure HS ... precise and rapid extraction of populations of ... samples with Laser Capture Microdissection., Ensure ... Molecular Analysis , All CapSure LCM Caps ...
Opticon continuous fluorescence detector; includes optical base, analysis software, computer and monitor (this is an accessory for the DNA Engine thermal cyclers which must be ordered seperately)...
... systems are highly sensitive laser confocal systems ... are advanced scanners that meet your expectations, ... level, and optimizing the signal on the ... of the range for increased sensitivity. Results ...
Biology Products: