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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

How is the hypersensitive response integrated with other chemical defenses?

Summary Introduction

To review:

The association of the hypersensitive response with other chemical responses.

Introduction:

The plants protect themselves from foreign invading agents by mounting two types of responses and these are general response and an effector-mediated response. The hypersensitive response is a part of general response because it is immediately activated in response to the pathogenic agent. During a hypersensitive response, the wound area is surrounded by dead cells. Hypersensitive responses lead to the production of salicylic acid.

Explanation

Hypersensitive response accumulates dead cells around the wounded region. The dead cells secrete reactive oxygen species like hydrogen peroxide that degrades the nucleic acid and cell walls of the infectious agent. During a hypersensitive response, salicylic acid (SA) is also produced, which play roles in the defensive chemical pathways.

The PR (pathogenesis-related) proteins are hydrolytic enzymes that are secreted by the SA...

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