Navigation Links
Reproducing early and often is the key to rapid evolution in plants
Date:10/3/2008

New Haven, Conn. Yale researchers have harnessed the power of 21st century computing to confirm an idea first proposed in 1916 that plants with rapid reproductive cycles evolve faster. Their findings appear in the October 3rd edition of Science.

"Our study has profound consequence for the understanding of evolution made possible by the critical role of the computer in revealing major evolutionary patterns," said senior author Michael Donoghue, the G. Evelyn Hutchinson Professor of Ecology & Evolutionary Biology and Curator of Botany at Yale's Peabody Museum of Natural History

Long involved with the Tree of Life Web Project, which is attempting to reconstruct the "tree" representing the genealogical relationships of all species on Earth, Donoghue has spearheaded the study of flowering plant evolution. In animals, the variation in rate of molecular evolution has been ascribed to differences in generation time, metabolic rate, DNA repair, and body size; in plants, the differences have been more difficult to determine.

The current analysis evaluated DNA sequence data for five major evolutionary lineages within the flowering plants, comparing genetic markers in their chloroplast, nuclear, and mitochondrial genomes. The authors also employed new methods for making some of the largest phylogenetic trees ever built.

A clear pattern emerged. Plants with a shorter generation time from the time they germinate to the time that a seed they produce germinates generally show more rapid rates of molecular evolution. Longer-lived trees and shrubs, by contrast, evolve more slowly and show less variability in their rates of evolution. The study also showed that the difference in rate seen between herbs and woody plants has been maintained through evolutionary time.

"To give an idea of the scope of the data managed in this study, the largest data set contained over 4500 species, while typical tests of such hypotheses are based on less than 50 species in total," said Yale graduate student and lead author Stephen Smith.

For each branch on each limb of the "tree," the researchers calculated the rate of molecular evolution by determining the number of DNA nucleotide substitutions per site per million years.

Their analyses highlight the difficulty in using molecular data to infer the timing of evolutionary events, and suggest that new strategies may be necessary in using DNA sequence "barcodes" to identify plant species, and in setting conservation priorities.

"Our data indicate that some kinds of plants will be easy to ID and others will be much more difficult," said Smith. "The slower a plant species evolves, the harder it is to differentiate it from related plants. But our analyses point in a good new direction."


'/>"/>

Contact: Janet Rettig Emanuel
janet.emanuel@yale.edu
203-432-2157
Yale University
Source:Eurekalert

Related biology news :

1. 60 second test could help early diagnosis of common brain diseases
2. Restless legs syndrome affects nearly 2 percent of US/UK children
3. Bleeding, not inflammation, is major cause of early lung infection death
4. Pig study sheds new light on the colonisation of Europe by early farmers
5. Color contrast is seen by the brain early doors
6. Extra gene copies were enough to make early humans mouths water
7. Was ability to run early mans Achilles heel?
8. New technique can be breakthrough for early cancer diagnosis
9. Yam bean a nearly forgotten crop
10. NIH awards nearly $23M to University of Chicago for translational research
11. Yam bean a nearly forgotten crop
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/20/2016)... 2016  VoiceIt is excited to announce its ... By working together, VoiceIt and VoicePass will ... VoicePass take slightly different approaches to voice biometrics, ... and usability. ... partnership. "This marketing and technology partnership ...
(Date:5/3/2016)...  Neurotechnology, a provider of high-precision biometric identification ... Identification System (ABIS) , a complete system for ... can process multiple complex biometric transactions with high ... face or iris biometrics. It leverages the core ... MegaMatcher Accelerator , which have been used in ...
(Date:4/26/2016)... Research and Markets has announced ... 2016-2020"  report to their offering.  , ,     (Logo: ... analysts forecast the global multimodal biometrics market to ... period 2016-2020.  Multimodal biometrics is being ... the healthcare, BFSI, transportation, automotive, and government for ...
Breaking Biology News(10 mins):
(Date:5/25/2016)... ... May 25, 2016 , ... WEDI, the nation’s leading ... today announced that Charles W. Stellar has been named by the WEDI Board of ... January 2016. As an executive leader with more than 35 years of experience in ...
(Date:5/24/2016)...   MedyMatch Technology Ltd ., the data analytics healthcare ... support tools in the emergency room, announced today that it ... Technology Industries (IATI) BioMed Conference. The Conference ... National Life Sciences and Technology Week, and is being held ... Tel Aviv, Israel . Gene Saragnese ...
(Date:5/23/2016)... (PRWEB) , ... May 23, 2016 , ... ... That Will Drive Precision Farming in 2017 and Beyond. The paper outlines the ... in the precision ag industry. , “We’ve witnessed a lot of highs and ...
(Date:5/23/2016)... ... May 23, 2016 , ... RoviSys, a leading independent provider ... Ohio, has broken ground on a new building in Holly Springs, NC. With ... new location solidifies a commitment to business in the region. The new facility ...
Breaking Biology Technology: