Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Crosstalk in plant resistance

10.11.2008
Japanese plant biologists have provided the first molecular evidence that when plants are in combat with environmental stressors they are less able to battle invading pathogens.

Researchers unearth molecular evidence of an antagonistic relationship between abiotic and biotic stress defenses in plants

Japanese plant biologists have provided the first molecular evidence that when plants are in combat with environmental stressors they are less able to battle invading pathogens.

Survival in the plant world depends on the ability to resist not only disease but also changes in the physical surroundings. A mechanism known as systemic acquired resistance (SAR) is one of the defenses plants use against biotic threats such as bacteria, viruses and fungi. Their reactions to abiotic stressors such as temperature, drought and salinity are governed by a different system that is influenced by the plant hormone abscisic acid (ABA).

These defense mechanisms may suppress each other, resulting in reduced disease resistance during times of physical stress, according to previous research. Now a team of researchers, led by Hideo Nakashita from the RIKEN Advanced Science Institute in Wako, has performed the first detailed examination of antagonistic crosstalk between these systems.

By stimulating both resistance systems in various mutants of the model mustard plant Arabidopsis, the team showed that induction of the ABA-mediated environmental stress response suppressed the induction of the disease-fighting SAR mechanism.

The researchers, including Michiko Yasuda of the RIKEN Advanced Science Institute, replicated an abiotic hazard by treating Arabidopsis plants with salt. They found that increasing the salinity level significantly suppressed the chemical induction of SAR-based disease resistance. The inhibition of SAR by this response to environmental stress proved to be ABA dependent.

The team also showed that ABA pre-treated Arabidopsis plants could not combat bacterial infection even if SAR-promoting chemicals were introduced. Anti-pathogen resistance genes failed to be expressed in plants that had been treated with ABA, indicating that this chemical, and hence the abiotic stress response, affects the SAR system at a molecular level. Equally, the team found that the activation of SAR suppressed the expression of ABA-responsive and ABA-biosynthesis genes.

Nakashita and his colleagues propose that a three-sided antagonistic interaction between ABA and two other plant hormones, salicyclic acid (SA) and jasmonic acid (JA), controls the response to external abiotic and biotic stresses. They note that this antagonistic crosstalk would be useful in nature because reactions to both disease and environmental stress require significant amounts of energy for gene expression and metabolic changes, and plants need to regulate the amount of resources given to each reaction to survive. ”Clarification of the detailed mechanism of the antagonistic interaction would enable us to improve crop protection and agricultural systems in adverse environments,” says Nakashita.

Reference

1. Yasuda, M., Ishikawa, A., Jikumaru, Y., Seki, M., Umezawa, T., Asami, T., Maruyama-Nakashita, A., Kudo, T., Shinozaki, K., Yoshida, S. & Nakashita, H. Antagonistic interaction between systemic acquired resistance and the abscisic acid-mediated abiotic stress response in Arabidopsis. The Plant Cell 20, 1678–1692 (2008).

The corresponding author for this highlight is based at the RIKEN Plant Acquired Immunity Research Unit

Saeko Okada | ResearchSEA
Further information:
http://www.rikenresearch.riken.jp/research/566/
http://www.researchsea.com

More articles from Life Sciences:

nachricht Water forms 'spine of hydration' around DNA, group finds
26.05.2017 | Cornell University

nachricht How herpesviruses win the footrace against the immune system
26.05.2017 | Helmholtz-Zentrum für Infektionsforschung

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Can the immune system be boosted against Staphylococcus aureus by delivery of messenger RNA?

Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.

Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....

Im Focus: A quantum walk of photons

Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.

The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....

Im Focus: Turmoil in sluggish electrons’ existence

An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.

We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...

Im Focus: Wafer-thin Magnetic Materials Developed for Future Quantum Technologies

Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.

Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...

Im Focus: World's thinnest hologram paves path to new 3-D world

Nano-hologram paves way for integration of 3-D holography into everyday electronics

An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Marine Conservation: IASS Contributes to UN Ocean Conference in New York on 5-9 June

24.05.2017 | Event News

AWK Aachen Machine Tool Colloquium 2017: Internet of Production for Agile Enterprises

23.05.2017 | Event News

Dortmund MST Conference presents Individualized Healthcare Solutions with micro and nanotechnology

22.05.2017 | Event News

 
Latest News

How herpesviruses win the footrace against the immune system

26.05.2017 | Life Sciences

Water forms 'spine of hydration' around DNA, group finds

26.05.2017 | Life Sciences

First Juno science results supported by University of Leicester's Jupiter 'forecast'

26.05.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>