Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Plant Sex Protein Identified at UC Riverside

11.12.2003



Discovery Shapes Understanding of how Seeds are Created

Researchers at the University of California, Riverside have identified a protein that helps guide sperm to egg in flowering lily plants, a significant step forward in the field of plant reproduction.

Elizabeth Lord, professor of plant biology and a member of the Center for Plant Cell Biology at UC Riverside, authored the paper titled “Chemocyanin, a Small, Basic Protein from the Lily Stigma Induces Pollen Tube Chemotropism.” The paper appears this week in the Proceedings of the National Academy of Sciences.



Botanists have long known that, in flowering plants, the female organs play a role in guiding sperm-laden pollen tubes to the eggs found in ovules. But until now, they did not know exactly how. Lord’s team found that chemocyanin, a protein with a previously unknown function, effectively guided sperm-laden lily pollen tubes to the plant’s ovules, which hold the eggs from which come seeds in the lily. The protein works specifically in lilies. Tobacco pollen tubes were not similarly guided.

The paper also shows that chemocyanin was more effective when another protein found in the stigma of the lily, SCA, was present. Chemocyanin and other proteins such as SCA may unlock the network of signals involved in plant reproduction.

“The importance of understanding how plants reproduce is enormous for the future manipulation of crop and nursery plants,” said Lord. “There is a huge flower industry in California, and we know little about how seed set occurs in most flowering plants.”

Lilies are good examples because they cannot produce seed with their own pollen so they must be cross-pollinated with another variety, according to Lord. And while the industry grows Easter lilies from bulbs not seed, whenever they want to produce new varieties for the flower market or for gardens they have to produce seed by crossing varieties.

“This research has relevance for all flowering plants because we do not know yet how pollen tubes, which carry sperm cells, are guided to the egg cell in the ovary,” said Lord. “Our discovery of a protein from the pistil which acts to guide pollen tubes to the egg cell is a first for flowering plants.”

The protein, chemocyanin, is concentrated on the flower stigma, where pollen grains land on the flower. The pollen grains germinate on the stigma to form pollen tubes, which carry sperm cells, then pass through the female tissues starting from the stigma, ending up in the ovary, which contain ovules that contain eggs.

“You would be surprised to know that we don’t even know the identity of the molecules that attract human sperm cells to the egg,” Lord added.

Lord’s research team at UC Riverside included doctoral students Sunran Kim and Juan Dong; postgraduate researchers Jean-Claude Mollet and Sang-Youl Park; and academic coordinator in the Department of Chemistry, Kangling Zhang.

Ricardo Duran | UC Riverside
Further information:
http://www.newsroom.ucr.edu/cgi-bin/display.cgi?id=710
http://www.ucr.edu

More articles from Life Sciences:

nachricht NYSCF researchers develop novel bioengineering technique for personalized bone grafts
18.07.2018 | New York Stem Cell Foundation

nachricht Pollen taxi for bacteria
18.07.2018 | Technische Universität München

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Im Focus: Breaking the bond: To take part or not?

Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.

A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...

Im Focus: New 2D Spectroscopy Methods

Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.

"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....

Im Focus: Chemical reactions in the light of ultrashort X-ray pulses from free-electron lasers

Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.

Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

NYSCF researchers develop novel bioengineering technique for personalized bone grafts

18.07.2018 | Life Sciences

Machine-learning predicted a superhard and high-energy-density tungsten nitride

18.07.2018 | Materials Sciences

Why might reading make myopic?

18.07.2018 | Health and Medicine

VideoLinks
Science & Research
Overview of more VideoLinks >>>