Navigation Links
Mate choice in plants
Date:6/27/2008

s compatible, it will germinate and send tubes through the extracellular matrix (ECM) of the style toward the ovary. It is in the style ECM where recognition and acceptance or rejection of the pollen takes place. Compatible pollen tubes grow unhindered toward the ovary. Incompatible pollen tubes become distorted and stop growing. The recognition mechanism is analogous to the immune systems in animals. Factors present in both the ECM and the pollen are needed for recognition and rejection or acceptance.

The most widespread SI system is genetically controlled at the chromosomal region called the S locus, which contains numerous alleles that control recognition specificity. These genes code for S-locus ribonucleases (S-RNases), enzymes that degrade RNA. S-RNases are expressed in the stigma, style and ovary and concentrate in the style ECM where they interact with pollen tubes. The recognition factors on the pollen side are the SLF (S-locus, F-box) alleles. If the S alleles of the pollen match those in the stylar ECM, the pollen is rejected. If they are different, the pollen tubes are allowed to grow toward the ovary.

The exact nature of the interactions is still unclear, but the work of Cruz-Garcia and other scientists suggests that S-RNases are taken up into the pollen tubes and sequestered there in vacuoles. If the pollen is too closely related and therefore incompatible, the vacuolar compartments are somehow disrupted, and the S-RNases released to the cytosol begin to destroy the RNA of the pollen tubes, in effect, killing them. However, S-specific matching between S-RNase and SLF, by itself is not sufficient for rejection of incompatible pollen. Other factors not linked to the S locus are also required in the genera Nicotiana (tobacco), Solanum (tomato) and Petunia. Three other glycoproteins, proteins with attached carbohydrate components, have been found to be associated with pollen tubes. These proteins, transmitting-tract-spec
'/>"/>

Contact: Dr. Felipe Cruz-Garcia
fcg@servidor.unam.mx
555-622-5279
American Society of Plant Biologists
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Restoring fish populations leads to tough choice for Great Lakes Gulls
2. Human clones: New U.N. analysis lays out worlds choices
3. Choices and Challenges forum to address nuclear power issue
4. Facial attraction -- choice of sexual partner shaped the human face
5. Climate change could severely impact Californias unique native plants
6. Newly identified role for power plants in human cells could lead to targeted therapies
7. Reforestation using exotic plants can disturb the fertility of tropical soils
8. When plants think alike
9. Neural cell transplants may help those with Parkinsons disease
10. Ecologists tease out private lives of plants and their pollinators
11. Woody and aquatic plants pose greatest invasive threat to China
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/16/2015)... , June 16, 2015 Fingerprint Cards ... communicated that it will amount to at least 340 MSEK ... to the rapid increase in market growth and orders received ... communicated guidance that revenue for 2015 will exceed 1,500 MSEK ... to approximately 2,200 MSEK. Due to receipt of ...
(Date:6/15/2015)... 15, 2015 A new report [ ... the majority of US consumers using mobile banking applications want ... as fingerprint and voiceprint, instead of having to prove who ... Telstra,s " Mobile Identity   -   The Fusion of ... smartphones now the primary channel used by Gen X and ...
(Date:6/12/2015)... June 12, 2015  Securus Technologies, a leading ... for public safety, investigation, corrections and monitoring, announced ... to electronically capture, analyze and identify participants of ... methods. This system can: ... enrollment and subsequent sign-on process is actually the ...
Breaking Biology News(10 mins):Fingerprint Cards Raises the Revenue Guidance for Q2 2015 and for the Full Year 2015 2Fingerprint Cards Raises the Revenue Guidance for Q2 2015 and for the Full Year 2015 3One in Four US Consumers Would Share Their DNA With Their Bank to Secure Financial and Personal Information, Telstra Report Finds 2One in Four US Consumers Would Share Their DNA With Their Bank to Secure Financial and Personal Information, Telstra Report Finds 3One in Four US Consumers Would Share Their DNA With Their Bank to Secure Financial and Personal Information, Telstra Report Finds 4Securus Announces Patent Issued for Authorized Presence Verification During Video Visitation 2
... skin. Cancer is not a static disease but during ... defences adapting to new environmental circumstances, protecting against chemotherapy ... Until now little was known about the mechanisms ... is a particularly intriguing way in which a tumour ...
... of carbon in the world,s oceans, which cover 70 ... climate cycles, with many questions remaining unanswered. Between 200 ... "twilight zone" where insufficient sunlight penetrates for microorganisms to ... resident at these depths capture carbon dioxide that they ...
... of spring-run Chinook salmon in California by the end ... at UC Davis, the Stockholm Environment Institute and the ... for managing water resources to protect the salmon runs, ... Thompson, director of the Center for Aquatic Biology and ...
Cached Biology News:Why cancer cells change their appearance? 2Up from the depths: How bacteria capture carbon in the 'twilight zone' 2Warming streams could be the end for salmon 2
(Date:7/2/2015)... , July 2, 2015 Amici ... Bio-tech procurement company Amici Procurement has chosen Microsoft Cloud ... it move to Office 365.      (Logo: ... small to medium-sized companies in the bio-tech sector with ... of the purchasing cycle to help them obtain best ...
(Date:7/2/2015)... ... 02, 2015 , ... In’Tech Medical SAS ( http://www.intech-medical.com ), ... today the acquisition of Turner Medical, Inc ., thus becoming a global ... the Spine Industry. The acquisition of Turner Medical ideally supplements In’Tech Medical’s product ...
(Date:7/1/2015)... TRIANGLE PARK, N.C. and ... agricultural research firm AgBiome, and Genective, key developer ... to accelerate the discovery of new generations of ... traits for insect control to counter the realities ... partner with Genective, aligning AgBiome,s unique insect control ...
(Date:7/1/2015)... , ... July 01, 2015 , ... The next-generation sequencing ... key market segments, including the molecular diagnostics industry. BCC Research reveals in its new ... NGS-based tests, lower test costs, and a growing need for better diagnostics as part ...
Breaking Biology Technology:Biotech Procurement Company Moves to Office 365 with iomart 2In'Tech Medical Acquires Turner Medical to Become a World Leader in Orthopedic Contract-Manufacturing 2In'Tech Medical Acquires Turner Medical to Become a World Leader in Orthopedic Contract-Manufacturing 3AgBiome and Genective collaborate to create novel insect-resistant crops 2NGS-Based Diagnostics, the ‘Must-Have Platform’, Sends Market Segment CAGRs Soaring According to BCC Research 2NGS-Based Diagnostics, the ‘Must-Have Platform’, Sends Market Segment CAGRs Soaring According to BCC Research 3
... April 30 Today John C. Lechleiter,Ph.D., president ... LLY ), provided,insight into the future of ... players, significant investments in the sector are rewarded. ... a gathering of,policymakers, business leaders and academics, under ...
... 30 Intense global competition,and today,s networked economy ... Alliances as the strategy of the next century. ... it to be sustainable and,mutually beneficial., How ... study on Forging,Partnerships That Work is a roadmap ...
... Inc. (Nasdaq: PBIO ) today announced that the ... 2008 financial results and to,provide a business update. Anyone ... through a live web-cast. The,teleconference and web-cast information is ... Time: 9:00 a.m. Eastern Time (ET), To attend ...
Cached Biology Technology:Lilly CEO Urges Policy Prescriptions to Help Ensure Public and Private Biotech Investments Generate Dividends and U.S. Job Growth 2Lilly CEO Urges Policy Prescriptions to Help Ensure Public and Private Biotech Investments Generate Dividends and U.S. Job Growth 3Biopharmaceutical Alliances: Forging Partnerships That Work 2Pressure BioSciences, Inc. to Discuss First Quarter 2008 Financial Results and Provide Business Update 2
Clarin Mounting Medium (Permanent environmentally safe mounting medium for general histology & cytology use)...
... Rabbit polyclonal to JAK2 (phospho ... tested applications). Antigen: ... JAK2 around the phosphorylation site of ... Entrez Gene ID: ...
... Perm Buffer III is ... fixation of PBMCs (or ... staining for intracellular kinases ... simultaneously. Applications: Intracellular ...
Cytofix/Cytoperm Kit 250 Tests...
Biology Products: