Navigation Links
Ancestors of land plants revealed
Date:4/17/2011

It was previously thought that land plants evolved from stonewort-like algae. However, new research published in BioMed Central's open access journal BMC Evolutionary Biology shows that the closest relatives to land plants are actually conjugating green algae such as Spirogyra.

Ancestors of green plants began to colonise the land about 500 million years ago and it is generally accepted that they evolved from streptophyte algae (a group of green, fresh water algae). But this group of algae is very diverse and currently ranges from simple, one cell, flagellates to more complex, branching, algae such as stoneworts (Chara).

It was thought that Charales were the closest relatives to land plants because they share (amongst other characteristics) a similar method of fertilisation, oogamy, with a large egg and small swimming sperm. For flowering plants this sperm is contained within pollen grains. In contrast, another type of streptophytes, the Zygnematales, use conjugation, a method of reproduction where the gametes are of equal size, isogamy, and one or both crawl, amoeba-like, into a fertilization tube where they meet and fuse.

Some phylogenetic analysis had been done previously, on a smaller number of genes, which seemed to support the Charales theory. However, a multinational team, involving researchers in Germany and Canada, analysed genetic divergence in 129 genes from 40 different green plant taxa. This data showed that, despite the differences in reproductive strategy, the closest living relatives to land plants are in fact the Zygnematales.

Dr Becker explained, "It seems that Zygnematales have lost oogamy and their ability to produce sperm and egg cells, and instead, possibly due to selection pressure in the absence of free water, use conjugation for reproduction. Investigation of such a large number of genes has shown that, despite their apparent simplicity, Zygnematales have genetic traces of other complex traits also associated with green land plants. Consequently Zygnematales true place as the closest living relative to land plants has been revealed."


'/>"/>

Contact: Dr. Hilary Glover
hilary.glover@biomedcentral.com
44-020-319-22370
BioMed Central
Source:Eurekalert

Related biology news :

1. Rodents were diverse and abundant in prehistoric Africa when our human ancestors evolved
2. Ancient DNA identifies donkey ancestors, people who domesticated them
3. Crocodile and hippopotamus served as brain food for early human ancestors
4. East-African human ancestors lived in hot environments, says Caltech-led team
5. Understanding apples ancestors
6. Fish on the menu of our ancestors
7. Two from one: Pitt research maps out evolution of genders from hermaphroditic ancestors
8. Circadian rhythms spark plants ability to survive freezing weather
9. Shootingstars provide clues to likely response of plants to global warming
10. New genetic study helps to solve Darwins mystery about the ancient evolution of flowering plants
11. Are invasive plants a threat to native biodiversity? It depends on the spatial scale
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/21/2016)... 22, 2016 Unique technology ... for superior security   Xura, ... of secure digital communications services, today announced it is ... offer enterprise customers, particularly those in the Financial Services ... voice authentication within a mobile app, alongside, and in ...
(Date:3/15/2016)... 15, 2016 Yissum Research Development Company ... company of the Hebrew University, announced today the formation ... technology of various human biological indicators. Neteera Technologies has ... from private investors. ... detection of electromagnetic emissions from sweat ducts, enables reliable ...
(Date:3/11/2016)... PUNE, India , March 11, 2016 ... to a new market research report "Image Recognition Market ... by Application (Marketing and Advertising), by Deployment Type (On-Premises ... Global Forecast To 2022", published by MarketsandMarkets, the global ... in 2015 to USD 29.98 Billion by 2020, at ...
Breaking Biology News(10 mins):
(Date:5/24/2016)... ... May 24, 2016 , ... Media Cybernetics, ... new Media Cybernetics corporate branding reflects a results-driven revitalization for a company with ... The re-branding components include a crisp, refreshed logo and a new web presence. ...
(Date:5/23/2016)... LONDON , May 23, 2016 ... Efficiency by 40% - Frontage Implement a Single Platform ... Quality, Compliance and Traceability Within the Bioanalytical lab Frontage ... the United States and China ... across its laboratory facilities. In addition to serving as the global ...
(Date:5/20/2016)... MN (PRWEB) , ... May 20, 2016 , ... Kablooe ... consumer goods companies, today announced its official 25th anniversary of the business. “We have ... are so grateful to our customers for the privilege and honor of serving their ...
(Date:5/19/2016)... -- There is no saying when exactly ... pressures in pricing and lack in consumer confidence. One ... - numerous opportunities are up for grabs but this ... four names in this sector: Portola Pharmaceuticals Inc. (NASDAQ: ... VTAE ), Anthera Pharmaceuticals Inc. (NASDAQ: ...
Breaking Biology Technology: