Systemic acquired resistance (SAR) and induced systemic resistance (ISR) are two distinct strategies of plant defense used to protect against disease-causing organisms. Although both strategies involve the production of defense-related molecules within the plant, there are some key differences between them.
Overview of systemic acquired resistance
Systemic acquired resistance (SAR) is a type of plant defense response that is activated when a plant is exposed to a pathogen or pest. It involves the activation of a complex network of defense responses that help the plant protect itself from further attacks. Unlike induced systemic resistance (ISR), which is triggered by a specific treatment, SAR is a natural response that occurs in the absence of any external treatment.
Unlike induced systemic resistance (ISR), which is triggered by a specific treatment, SAR is a natural response that occurs in the absence of any external treatment. SAR typically involves the production of defense-related proteins and metabolites, as well as the induction of systemic immunity throughout the entire plant. This makes SAR a more effective and long-lasting form of defense than ISR, which is triggered by a specific treatment and is often short-lived.
Overview of induced systemic resistance
Systemic acquired resistance (SAR) and induced systemic resistance (ISR) are two different types of defense mechanisms that plants use to protect themselves from diseases. SAR is a broad-spectrum response that is triggered by an initial infection, causing general activation of defenses that can help protect against a wide range of pathogens.
In other words, SAR is a “general” defense mechanism while ISR is a “specific” defense mechanism.
Advantages and disadvantages of systemic acquired resistance
Systemic acquired resistance (SAR) and induced systemic resistance (ISR) are two types of defense mechanisms used by plants to protect themselves from disease-causing organisms. While both approaches provide protection, they differ in how they work. SAR is a type of resistance that is activated by the recognition of a pathogen and the subsequent activation of defense mechanisms throughout the plant.
ISR, on the other hand, is a pre-existing resistance that is triggered by a beneficial organism, such as a beneficial bacteria or fungi. By providing protection from disease-causing organisms, both SAR and ISR can help plants remain healthy and productive.
However, the use of SAR may be limited by the fact that it is only activated when a pathogen is present, while ISR can provide ongoing protection regardless of pathogen presence. Additionally, SAR can take several days to be activated, while ISR can provide immediate protection.
Advantages and disadvantages of induced systemic resistance
Systemic acquired resistance (SAR) and induced systemic resistance (ISR) are two different forms of plant protection that help defend against pests and diseases. SAR occurs naturally when a plant is exposed to a pathogen, triggering a systemic reaction of defense mechanisms throughout the plant.
Both SAR and ISR have advantages and disadvantages that should be taken into consideration when deciding which form of resistance is best for a particular crop. SAR is an effective, natural form of defense, as plants are able to recognize and respond quickly to pathogens.
Furthermore, this response can last for several weeks, providing prolonged protection for crops. However, SAR is often triggered by the presence of a pathogen, which means that the plant needs to be in contact with the disease in order to activate the defense mechanisms.
ISR is a beneficial form of biocontrol, as it encourages the growth of beneficial microbes or compounds in the soil that can help to defend against pathogens. It can also provide a longer-lasting form of protection than SAR, as the beneficial microbes and compounds can remain in the soil for weeks or even months. However, the efficacy of ISR is often unpredictable, as its effectiveness can depend on the type of microbe or compound used, as well as environmental conditions.
Further resources
Systemic acquired resistance (SAR) and induced systemic resistance (ISR) are two distinct strategies for protecting plants against disease. SAR is a natural defense mechanism whereby a plant that has been exposed to a certain pathogen (a disease-causing organism) will become resistant to similar pathogens in the future.
ISR, on the other hand, involves introducing beneficial microorganisms or compounds to the plant that can activate a broad-spectrum defense response against a wide range of pathogens. In both cases, the protection is systemic, meaning that the defense extends to other parts of the plant and not just the area of exposure.
Conclusion
The key difference between systemic acquired resistance and induced systemic resistance is that systemic acquired resistance is a naturally occurring process that activates when a plant is attacked by a pathogen, while induced systemic resistance is an induced process whereby a plant is actively stimulated with a biostimulant or a biocontrol agent to protect it against a pathogen. Both processes are important for protecting plants against disease, but each have different benefits and drawbacks. Systemic acquired resistance is often more effective in the long-term, while induced systemic resistance can be implemented immediately to protect plants from an active attack.