Related Experiment Videos
Abscisic Acid and cutout in cotton
1United States Department of Agriculture, Agricultural Research Service, Western Cotton Research Lab, Phoenix, Arizona 85040.
Plant Physiology
|January 1, 1985
Summary
Cotton cutout, a decline in growth and fruit retention, is not caused by abscisic acid (ABA) from fruits moving to growing points. Fruit removal experiments showed ABA levels did not correlate with inhibited growth or flowering in cotton plants.
Area of Science:
- Plant Physiology
- Agricultural Science
- Cotton Agronomy
Background:
- Cotton cutout, characterized by reduced growth, flowering, and boll retention, is a significant issue in cotton production.
- Fruit load is suspected to influence cutout, potentially via hormonal signaling pathways.
Purpose of the Study:
- To investigate the hypothesis that cotton fruits produce abscisic acid (ABA).
- To determine if ABA moves from fruits to fruiting branches and growing points, inhibiting growth, flowering, and boll retention.
Main Methods:
- Experiments involved removing flowers or young bolls at the first node of cotton fruiting branches.
- Abscisic acid (ABA) content was measured in fruiting branches, abscission zones, and bolls at different nodes.
- Growth, flowering, and boll retention were monitored under varying fruit loads and after experimental defruiting.
Main Results:
- Removing flowers/bolls at the first node did not decrease ABA in adjacent tissues.
- ABA content in bolls at the second node varied, decreasing with cumulative fruit removal across branches.
- Early defruiting delayed cutout symptoms but did not alter ABA levels in mainstem apices or fruiting branches.
Conclusions:
- The study does not support the hypothesis that ABA from fruits directly inhibits growth, flowering, and boll retention in cotton.
- Hormonal regulation of cotton cutout may involve other mechanisms or signaling pathways beyond ABA translocation from fruits.