Abstract
Cotton ( Gossypium hirsutum L.) is a major fiber crop; however, cotton yields are often limited due to its extreme sensitivity to environmental stress such as high temperature and drought. t he current project was designed to evaluate the use of the plant growth regulator 1-methylcyclopropene (1-MCP) to alleviate the adverse effect of environmental stress on cotton yields. Three field studies were conducted in Arkansas in 2006 and 2007. An untreated control was compared with 1-MCP at 10 g ai ha -1 applied at first flower (FF), and another applied at FF and again two weeks later. Measure ments were made of boll weight, boll number and yield, as well as on plant physiological and biochemical responses. During the period of cotton fruit development, the maximum temperatures for Marianna, AR in 2006 and 2007 were well above the optimum 30 o C temperature for cotton growth, indicating that cotton was under heat stress. Plants that received 1-MCP at FF and FF+2 weeks had significantly higher seed cotton and lint yields than the untreated control. This result was possibly due to a significant weight increase in 1-MCP treated bolls located in the middle of the plant canopy as no effect was observed on cotton fruit abscission. Applications of 1-MCP significantly decreased the stress levels of cotton plants as indicated by higher maximum quantum efficiency of Photosystem II and lower activity of the leaf antioxidant glutathione reductase. No 1-MCP effect on protein and malondialdehyde content in leaves was observed. The study showed that foliar application of 1-MCP has the potential to improve yields due to reduced plant stress. T
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Claims 7
Claim · model-written summary
Maximum temperatures exceeded the cotton growth optimum during fruit development.
- Taxon
- cotton
Gossypium hirsutume0 - Outcome
- maximum temperaturese0
- Direction
- well abovee0
- Value
- 30 o Ce0
- Setting
- Marianna, ARe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum temperatures for Marianna, AR in 2006 and 2007 were well above the optimum 30 o C temperature for cotton growth”
Claim · model-written summary
1-MCP at both flowering times increased seed cotton and lint yields relative to untreated plants.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- 1-MCP at FF and FF+2 weekse0
- Outcome
- seed cotton and lint yieldse0
- Direction
- highere0
- Comparator
- untreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants that received 1-MCP at FF and FF+2 weeks had significantly higher seed cotton and lint yields than the untreated control.”
t0“Cotton”
Claim · model-written summary
1-MCP increased weight of bolls in the middle canopy.
- Taxon
- CottonGossypium hirsutumt0
- Organ / stage
- bollse0
- Treatment
- 1-MCPe0
- Outcome
- weighte0
- Direction
- increasee0
- Qualifier
- middle of the plant canopye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant weight increase in 1-MCP treated bolls located in the middle of the plant canopy”
t0“Cotton”
Claim · model-written summary
No effect on cotton fruit abscission was observed.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- fruit abscissione0
- Direction
- no effecte0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no effect was observed on cotton fruit abscission”
Claim · model-written summary
1-MCP raised maximum quantum efficiency of Photosystem II.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- 1-MCPe0
- Outcome
- maximum quantum efficiency of Photosystem IIe0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applications of 1-MCP significantly decreased the stress levels of cotton plants as indicated by higher maximum quantum efficiency of Photosystem II and lower activity of the leaf antioxidant glutathione reductase.”
Claim · model-written summary
1-MCP lowered leaf glutathione reductase activity.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- 1-MCPe0
- Gene
- glutathione reductasee0
- Outcome
- activity of the leaf antioxidant glutathione reductasee0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applications of 1-MCP significantly decreased the stress levels of cotton plants as indicated by higher maximum quantum efficiency of Photosystem II and lower activity of the leaf antioxidant glutathione reductase.”
Claim · model-written summary
1-MCP did not affect leaf protein and malondialdehyde content.
- Taxon
- CottonGossypium hirsutumt0
- Organ / stage
- leavese0
- Treatment
- 1-MCPe0
- Outcome
- protein and malondialdehyde contente0
- Direction
- No 1-MCP effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No 1-MCP effect on protein and malondialdehyde content in leaves was observed.”
t0“Cotton”
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See all 10 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.