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Reevaluating the conceptual framework for applied research on host-plant resistance
1Department of Entomology, Louisiana State University Agricultural Center, 404 Life Sciences Building, Baton Rouge, LA 70803, USA. mstout@agcenter.lsu.edu
Insect Science
|August 20, 2013
Summary
A new dichotomous framework for host-plant resistance to arthropod pests is proposed, replacing Painter's 60-year-old model. This approach better categorizes resistance mechanisms and promotes a mechanistic understanding for improved pest management.
Area of Science:
- Agricultural Science
- Entomology
- Plant Science
Background:
- Host-plant resistance (HPR) research has relied on Reginald Painter's 1951 trichotomous framework for six decades.
- Painter's model categorized resistance into nonpreference (antixenosis), antibiosis, and tolerance.
- This framework has limitations, including incomplete coverage of resistance mechanisms and ambiguity between antixenosis and antibiosis.
Purpose of the Study:
- To critically evaluate the existing framework for arthropod resistance in crop plants.
- To propose a revised, dichotomous scheme for classifying plant resistance mechanisms.
- To encourage a more mechanistic and integrated approach to studying and managing plant resistance.
Main Methods:
- Review and critique of the historical Painterian framework for host-plant resistance.
- Development of a new dichotomous classification system for plant resistance and tolerance.
- Analysis of the implications of the proposed framework for basic and applied research.
Main Results:
- The traditional trichotomous framework for plant resistance is shown to be inadequate and overly simplistic.
- A new dichotomous scheme is proposed, dividing traits into resistance (limiting plant injury) and tolerance (reducing yield loss per injury).
- The resistance category is further subdivided into constitutive/inducible and direct/indirect mechanisms.
Conclusions:
- Adopting the proposed dichotomous scheme will unify basic and applied plant resistance literature.
- This revised framework will foster a more mechanistic understanding of plant-insect interactions.
- A mechanistic approach is crucial for developing innovative strategies for integrating plant resistance into pest management programs.
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