7. Name two plant defense response which are placed under hypersensitive responses.
Answers
Explanation:
The hypersensitive defence response is found in all higher plants and is characterized by a rapid cell death at the point of pathogen ingress. It is usually associated with pathogen resistance, though, in specific situations, it may have other consequences such as pathogen susceptibility, growth retardation and, over evolutionary timescales, speciation. Due to the potentially severe costs of inappropriate activation, plants employ multiple mechanisms to suppress inappropriate activation of HR and to constrain it after activation. The ubiquity of this response among higher plants despite its costs suggests that it is an extremely effective component of the plant immune system.
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Explanation:
Hypersensitive Response
HR leads to a ring of dead cells around the pathogen penetration location stopping the pathogen invasion (Mur et al., 2007) and may lead to a plant-wide systemic acquired resistance (SAR).