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Ethylene and the annona flower
1Department of Subtropical Horticulture, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel.
Plant Physiology
|February 1, 1975
Summary
Ethylene production signals the male stage in Annona flowers, with reproductive organs, especially anthers, being the primary source. Manipulating ethylene levels or pressure affects the timing of this floral transition.
Area of Science:
- Plant reproductive biology
- Hormonal regulation in plants
- Floral development studies
Background:
- Annona (Annona hybrida) flowers exhibit protogyny, a temporal separation of sexual phases.
- Understanding the hormonal cues that regulate floral development is crucial for plant science.
Purpose of the Study:
- To investigate the role of ethylene in the floral transition of Annona (Annona hybrida).
- To identify the specific floral organs responsible for ethylene production.
- To determine the effects of exogenous ethylene and environmental factors on floral maturation.
Main Methods:
- Monitoring ethylene production during floral development.
- Applying ethylene and growth substances to flowers.
- Exposing flowers to hypobaric pressure.
- Observing changes in floral stage timing.
Main Results:
- Ethylene production significantly increased preceding the male stage of Annona flowers.
- Reproductive organs, particularly anthers, were the main sites of ethylene biosynthesis.
- Ethylene application accelerated the male stage but not the female stage.
- Hypobaric pressure delayed the onset of the male stage.
Conclusions:
- Ethylene plays a key role in regulating the transition to the male phase in Annona flowers.
- Ethylene biosynthesis in reproductive organs is a critical factor in floral maturation timing.
- Environmental factors like pressure can modulate ethylene-mediated floral development.