Which one of the following is NOT a typical feature of the hypersensitive response observed in plants during the attack of invading microbes?
Which one of the following is NOT a typical feature of the hypersensitive response observed in plants during the attack of invading microbes?
Select an option to attempt
Correct Answer: Option C
Explanation
Hypersensitive Response (HR) in plants — what does NOT occur:The Hypersensitive Response (HR) is a rapid, localised programmed cell death at the site of pathogen infection:Features of HR:• Rapid cell death (programmed apoptosis-like) at infection site •• Reactive oxygen species (ROS) burst (superoxide, H2O2) •• Nitric oxide (NO) production •• Salicylic acid signalling → systemic acquired resistance (SAR) •• Cell wall reinforcement (lignification, callose deposition) •• Antimicrobial phytoalexin accumulation •What does NOT occur during HR:• Photosynthetic rate INCREASE: During HR, resources are redirected toward defence responses. Chloroplasts can actually be disrupted and photosynthesis is typically SUPPRESSED (not increased) in infected tissue.Answer: Photosynthetic rate is NOT increased during HR; it is typically suppressed as resources redirect to defence.