False broomrape: a physiological disorder caused by growth-regulator imbalance
1Plant Science Research Division, Agricultural Research Service, United States Department of Agriculture, Department of Agronomy, University of Kentucky, Lexington, Kentucky 40506.
Plant Physiology
|August 1, 1972
Summary
False broomrape in tobacco plants can be triggered by hormonal changes or plant extracts. Applying auxin to debudded plants effectively prevents this parasitic weed
Area of Science:
- Plant biology
- Agronomy
- Phytopathology
Background:
- False broomrape (Phelipanche aegyptiaca) is a parasitic plant that significantly impacts tobacco (Nicotiana tabacum) cultivation.
- Understanding the factors that induce and prevent false broomrape is crucial for developing effective crop management strategies.
Purpose of the Study:
- To investigate the hormonal and environmental factors that induce the development of false broomrape on tobacco roots.
- To identify methods for preventing false broomrape infestation in tobacco plants.
Main Methods:
- Induction of false broomrape by applying cytokinins to tobacco roots.
- Manipulation of the cytokinin-auxin ratio in tobacco roots.
- Removal of apical and axillary buds from tobacco plants.
- Application of extracts from infected tobacco plants to healthy plants.
- Prevention of false broomrape by applying auxin to debudded plants.
Main Results:
- Cytokinin application to tobacco roots can induce false broomrape.
- An increased cytokinin-auxin ratio in tobacco roots also promotes false broomrape development.
- Removing apical and axillary buds can trigger false broomrape.
- Extracts from infected tobacco plants can induce the parasite in healthy plants.
- Auxin treatment of debudded plants effectively prevents false broomrape.
Conclusions:
- Hormonal balance, particularly the cytokinin-auxin ratio, plays a critical role in false broomrape induction in tobacco.
- Plant growth regulators like cytokinins and auxins are key factors in managing false broomrape infestations.
- Strategic application of auxin offers a potential method for preventing false broomrape in susceptible tobacco crops.
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