Navigation Links
Plant hemoglobins: Oxygen handlers critical for nitrogen fixation

Hemoglobins, key components of our blood, are ancient proteins with well-known roles in oxygen transport and respiration in animals. Hemoglobins are also present in plants and bacteria, but until now the physiological role of plant hemoglobins has been unclear. A group of researchers reveal this week that one such mysterious plant hemoglobin serves to assist in the fixation of nitrogen in the root nodules of legumes through a process that is conceptually not unlike that undertaken by mammalian hemoglobins in facilitating oxygen transport and exchange in the blood.

The most conspicuous plant hemoglobins are the symbiotic hemoglobins of legumes; these hemoglobins accumulate in root nodules and give these specialized organs their distinctive red color. Legume root nodules accommodate bacteria, called rhizobia, that reduce atmospheric nitrogen to ammonia, which is subsequently used by the plant for growth and colonization of nitrogen-poor soils. Symbiotic nitrogen fixation is important for sustainable agriculture and contributes millions of tons of reduced nitrogen to crops and pastures each year.

As reported this week, researchers led by Dr. Michael Udvardi at the Max Planck Institute of Molecular Plant Physiology have succeeded in eliminating the production of symbiotic hemoglobins in nodules of the model legume Lotus japonicus, enabling researchers to assess for the first time the role and importance of these proteins in plants. The results of the study indicate that symbiotic hemoglobins are important for oxygen transport and energy metabolism in plant root nodules. Furthermore, these proteins help to maintain free-oxygen concentrations in nodules at levels low enough to avoid damage of oxygen-sensitive nitrogenase, the bacterial enzyme complex responsible for symbiotic nitrogen fixation. Thus, plant hemoglobins fulfill roles analogous to those of animal hemoglobins, as well as novel roles that are apparently unique to symbiotic nitrogen fixation.


'"/>

Source:Cell Press


Page: 1 2

Related biology news :

1. Quantum Dots Research Leads to New Knowledge about Protein Binding in Plants
2. Plants, animals share molecular growth mechanisms
3. Plants respond similarly to signals from friends, enemies
4. Affymetrix Unveils Plans to Double Plant and Animal Genome Microarray Offering
5. Plants defy Mendels inheritance laws, may prompt textbook changes
6. Whats really making you sick? Plant pathologists offer the science behind Sick Building Syndrome
7. Plant Sacrifices Cells to Fight Invaders
8. Breakthrough System for Understanding Ocean Plant Life Announced
9. Plant pathologists evaluate eco-friendly alternatives to methyl bromide
10. Study: Plants use dual defense system to fight pathogens
11. Plants discriminate between self and non self
Post Your Comments:
(Date:10/16/2014)... Conn. , October 16, 2014 NXT-ID, ... or the "Company"), a biometric authentication company focused on ... its leading edge technologies including Wocket™, the Smart Wallet, ... (FiRe) Conferenece. FiRe is a leading global conference on ... Hosted by Mark Anderson , founder and ...
(Date:10/15/2014)... As our ability to assess the pandemic risk from ... developments, we must not allow ourselves to become complacent ... an international consortium of scientists. , Influenza pandemics arise ... have yet to develop widespread immunity – spreads in ... in the past 100 years, the worst of which ...
(Date:10/15/2014)... German Gauß-Allianz has admitted Johannes Gutenberg University Mainz ... Rhineland-Palatinate science hub continues to maintain a significant ... , "The acceptance of Johannes Gutenberg University ... is a milestone in the national and international ... The state of Rhineland-Palatinate can be proud that ...
Breaking Biology News(10 mins):NXT-ID Inc. to Present at 13th Annual FiRe Conference 2NXT-ID Inc. to Present at 13th Annual FiRe Conference 3Scientists 'must not become complacent' when assessing pandemic threat from flu viruses 2Johannes Gutenberg University Mainz joins Germany's Gauss-Allianz as a full member 2Johannes Gutenberg University Mainz joins Germany's Gauss-Allianz as a full member 3
... Varanus komodoensis ) are known to bite prey and release ... the victims are reported to go into shock before the ... prey are killed by pathogenic bacteria in the dragons, mouths ... of Proceedings of the National Academy of Sciences ...
... active site found in a naturally occurring enzyme, chemists at ... like nature,s most pervasive hydrogen processor. , The researchers describe ... Journal of the American Chemical Society , and posted ... puzzled by nature,s ability to use cheap and plentiful building ...
... million cases of malaria are diagnosed each year mostly ... treat malaria do exist, the demand for new treatments ... have developed a resistance to existing medications. Now, ... have discovered one way to stop malaria parasite growth, ...
Cached Biology News:Komodo even more deadly than thought: Research 2New lead on malaria treatment 2
(Date:10/17/2014)... October 17, 2014 For the ... employers, as published in today’s print issue of ... annual Top Employers Survey polled employees in the ... 20 best employers. Rankings were determined based ... to rate their companies on 23 characteristics, including ...
(Date:10/17/2014)... 17, 2014 The report "Advanced ... Boilers, Super Critical Boilers, Ultra Super Critical Boilers, ... Plants, Cogeneration Plants, Natural Gas Power Plants, Clean ... Global Trends & Forecasts to 2019", defines and ... analysis and forecast of the global revenue. , ...
(Date:10/17/2014)... (PRWEB) October 17, 2014 The Europe ... additives market in Europe with analysis and forecast of ... Fuel Additives Market report, to get an idea of ... of the segmentation in the European fuel additives market, ... , http://www.micromarketmonitor.com/market/europe-fuel-additives-5379768082.html , Fuel additives are chemicals ...
(Date:10/17/2014)... Mallard Creek Polymers, ... of Styrene-Butadiene polymer emulsions for use in ... variety of other applications. Their Rovene®, Tylac® and ... these applications.  , Styrene-butadiene (SB) polymer emulsions ... effectiveness.  SB polymer emulsions possess superior water, ...
Breaking Biology Technology:DuPont Named Top Employer by Science Magazine 2DuPont Named Top Employer by Science Magazine 3Advanced Utility Boiler Market Worth $2,764.19 Billion by 2019 - New Report by MarketsandMarkets 2Advanced Utility Boiler Market Worth $2,764.19 Billion by 2019 - New Report by MarketsandMarkets 3Advanced Utility Boiler Market Worth $2,764.19 Billion by 2019 - New Report by MarketsandMarkets 4Advanced Utility Boiler Market Worth $2,764.19 Billion by 2019 - New Report by MarketsandMarkets 5The Europe Fuel Additives Market is estimated to grow to $1,401.4 million by 2018 - New Report by MicroMarket Monitor 2The Europe Fuel Additives Market is estimated to grow to $1,401.4 million by 2018 - New Report by MicroMarket Monitor 3The Europe Fuel Additives Market is estimated to grow to $1,401.4 million by 2018 - New Report by MicroMarket Monitor 4Mallard Creek Polymers Reminds Industry of the Full Line of Styrene-Butadiene Polymer Emulsions 2
... A few weeks back, I suggested that the role of IT ... I have this picture in my head of urgent communiqus and ... views all colliding in the middle of tense situations that could ... cross-culture experience, patience and a great deal of flexibility is the ...
... - A proposed state ban on all forms of ... on Children and Families and is headed for a full ... fast track with identical bills - SB 243 and AB ... has drawn vigorous opposition from both the scientific community and ...
... 499, a proposed ban on all forms of human cloning ... embryos both for reproductive purposes and for what practitioners have ... embryo for the purpose of extracting stem cells. Penalties for ... go up to ten years in prison and $1 million ...
Cached Biology Technology:IT is the New Foreign Service 2IT is the New Foreign Service 3Cloning ban too broad, stem-cell researchers argue 2Cloning ban too broad, stem-cell researchers argue 3Cloning ban too broad, stem-cell researchers argue 4
Convenient 10X buffer concentrate used to maximize binding to the solid phase in microwell ELISA. Formulated to provide optimal pH and ionic strength for binding of antibodies and some antigens. Co...
... PCR detection system holds 48 x 0.2 ml ... 48 LEDs independently excites fluorescence (470-500 nm) for ... detects emitted light (523-543 nm and 540-700 nm). ... cycler, whose Peltier heat pumps provide superb thermal ...
... assay (EMSA) is a powerful tool for ... gel shift or gel retardation, the assay ... subjected to electrophoresis, free DNA will migrate ... LightShift Chemiluminescent EMSA Kit is a nonradioactive ...
... Quantas unique combination of Coulter volume ... capabilities and accurate cell counting. This ... including UV, allowing flexible fluorochrome selection ... typically only achievable with larger, more ...
Biology Products: