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. The 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. Measurements 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 30oC 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.
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Claims 10
Claim · model-written summary
Maximum temperatures during fruit development exceeded the cotton optimum.
- Taxon
- cotton
Gossypium hirsutume0 - Outcome
- maximum temperaturese0
- Direction
- well abovee0
- Comparator
- optimum 30oC temperaturee0
- Setting
- Marianna, ARe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the maximum temperatures for Marianna, AR in 2006 and 2007 were well above the optimum 30oC temperature for cotton growth”
Claim · model-written summary
1-MCP increased seed cotton yield relative to untreated controls.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- 1-MCP at FF and FF+2 weekse0
- Outcome
- seed cottone0
- 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 lint yield relative to untreated controls.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- 1-MCP at FF and FF+2 weekse0
- Outcome
- 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“a significant weight increase in 1-MCP treated bolls located in the middle of the plant canopy”
t0“Cotton”
Claim · model-written summary
1-MCP had no observed effect on cotton fruit abscission.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- 1-MCPe1
- Outcome
- cotton fruit abscissione0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no effect was observed on cotton fruit abscission”
e1“Plants that received 1-MCP at FF and FF+2 weeks had significantly higher seed cotton and lint yields than the untreated control”
Claim · model-written summary
1-MCP increased 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”
Claim · model-written summary
1-MCP lowered leaf glutathione reductase activity.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- leafe0
- Treatment
- 1-MCPe1
- Gene
- glutathione reductasee0
- Outcome
- activitye0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower activity of the leaf antioxidant glutathione reductase”
t0“Cotton”
e1“Applications of 1-MCP significantly decreased the stress levels of cotton plants as indicated by higher maximum quantum efficiency of Photosystem II”
Claim · model-written summary
1-MCP showed no observed effect on leaf protein content.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- leavese0
- Treatment
- 1-MCPe0
- Outcome
- proteine0
- 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”
Claim · model-written summary
1-MCP showed no observed effect on leaf malondialdehyde content.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- leavese0
- Treatment
- 1-MCPe0
- Outcome
- 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”
Claim · model-written summary
The authors concluded foliar 1-MCP could improve yield by reducing plant stress.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- foliar application of 1-MCPe0
- Outcome
- improve yieldse0
- Qualifier
- has the potentiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar application of 1-MCP has the potential to improve yields due to reduced plant stress”
t0“Cotton”
The same questions in other papers
1-methylcyclopropene · growth · Gossypium hirsutum (cotton)Results differ
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See all 13 papers →1-methylcyclopropene · physiology: photosynthesis · Gossypium hirsutum (cotton)Positive and negative results
7 papers in the same direction as this paper · 2 in the opposite direction
- no effect
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See all 10 papers →1-methylcyclopropene · organism · Gossypium hirsutum (cotton)Results agree
1 paper in the same direction as this paper
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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.