Which of the following statements correctly describe post-harvest disease infection?

Question

BlackTom AI · Accepted Answer

Post-harvest pathogens enter fruits by three main routes: opportunistic colonization, direct penetration using specialized structures (like appressoria), and entry via wounds or natural openings that do not require such structures.

1) Relevant knowledge points and concepts
- Opportunistic pathogens: Many fungi (e.g., Botrytis cinerea) colonize fruit tissues weakened by prior damage, ripening, or other infections. They do not require initial specialized penetration so they often follow other infections.
- Appressorium-mediated penetration: Some plant pathogenic fungi (e.g., Colletotrichum spp., Magnaporthe) form an appressorium, a specialized, melanized adhesion/pressure-generating structure that allows direct mechanical and enzymatic penetration of intact cuticle and cell wall.
- Indirect penetration via openings/wounds: Natural openings (stomata, lenticels) or harvest/storage wounds provide entry points; pathogens entering here typically do not need appressoria or other specialized penetration organs.

2) Step-by-step reasoning
- Statement A claims some post‑harvest fungi are opportunistic and colonize already infected or weakened fruits. This matches the opportunistic behavior of common post-harvest rots (true).
- Statement B claims fungal pathogens can infect directly using an appressorium. Known pathogenic fungi use appressoria to breach intact surfaces (true).
- Statement C claims indirect penetration through natural openings and cuts does not require specialized structures. Entry through wounds/openings is passive and does not require appressoria (true).

3) Intermediate logical steps
- If A is true and B is true and C is true, then the combined statement “A, B and C” is true.
- Any option excluding one of these true statements (for example “A and B only”) would be incomplete.

4) Why the correct answer is correct
Because each individual statement (A, B, and C) accurately describes a recognized mode or property of post-harvest pathogen infection, the only fully correct choice is the one that includes all three.

5) Why other options are incorrect
- “A and B only” is incorrect because it omits C, which is true. 
- Individual-letter options (A or B or C alone) are incomplete descriptions and thus not fully correct.

Conclusion: All three statements A, B and C are correct; therefore the correct answer is “A, B and C,” which matches the provided answer.

Which of the following statements correctly describe post-harvest disease infection?单项选择题

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