Abstract
Abstract Cotton, ( Gossypium hirsutum L.) when grown in a fertile, well‐watered, and suitable environment, produces excessive vegetative growth. Such luxuriant growth causes several production problems. A plant growth regulator, mepiquat chloride 1 (1,1‐dimethylpiperidinium chloride; BASF Wyandotte Corp., Parsippany, NJ) has been found to reduce vegetative growth, but the crop responses to it appears to be temperature sensitive. An experiment was conducted to determine the crop responses to temperature in naturally lighted, temperature‐ and CO 2 ‐controlled plant growth chambers. The experiment was conducted at five temperatures and measurements were made of several plant parameters. A preliminary experiment showed that mepiquat chloride (MC) caused a dramatic reduction in plant height and number of main‐stem nodes. A more detailed study showed that the impact of MC on main‐stem elongation was temperature dependent, with the greatest effect occurring at 35/25 °C day/night temperatures. The application of MC also caused a reduction in mainstem, vegetative‐branch and fruiting‐branch node formation. Leaf area was reduced on plants treated with MC at each of the temperatures. Specific leaf area (m 2 kg −1 ) was also reduced on leaves from various positions on the plants. It appears that MC affects more than one physiological process. The primary effects were reduction in stem elongation, node formation, and leaf expansion. The reduced stem growth and leaf area development also caused greater leaf densities—probably a secondary or tertiary effect.
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Claims 8
Claim · model-written summary
Mepiquat chloride reduced cotton plant height and main stem node number.
- Taxon
- Cotton
Gossypium hirsutumt0 - Treatment
- mepiquat chloride (MC)e0
- Outcome
- plant height and number of main‐stem nodese0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mepiquat chloride (MC) caused a dramatic reduction in plant height and number of main‐stem nodes”
t0“Cotton”
Claim · model-written summary
The effect of MC on main stem elongation was greatest at 35/25 °C.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- MCe0
- Outcome
- main‐stem elongatione0
- Direction
- greateste0
- Value
- 35/25 °Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the impact of MC on main‐stem elongation was temperature dependent, with the greatest effect occurring at 35/25 °C day/night temperatures”
t0“Cotton”
Claim · model-written summary
MC reduced cotton main stem node formation.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- MCe0
- Outcome
- mainsteme0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of MC also caused a reduction in mainstem, vegetative‐branch and fruiting‐branch node formation”
t0“Cotton”
Claim · model-written summary
MC reduced vegetative branch node formation.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- MCe0
- Outcome
- vegetative‐branche0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of MC also caused a reduction in mainstem, vegetative‐branch and fruiting‐branch node formation”
t0“Cotton”
Claim · model-written summary
MC reduced fruiting branch node formation.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- MCe0
- Outcome
- fruiting‐branch node formatione0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of MC also caused a reduction in mainstem, vegetative‐branch and fruiting‐branch node formation”
t0“Cotton”
Claim · model-written summary
MC reduced leaf area at every tested temperature.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- MCe0
- Outcome
- Leaf areae0
- Direction
- reducede0
- Qualifier
- at each of the temperaturese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf area was reduced on plants treated with MC at each of the temperatures”
t0“Cotton”
Claim · model-written summary
MC reduced specific leaf area at various leaf positions.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- MCe1
- Outcome
- Specific leaf areae0
- Direction
- reducede0
- Qualifier
- various positions on the plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Specific leaf area (m 2 kg −1 ) was also reduced on leaves from various positions on the plants”
e1“plants treated with MC”
t0“Cotton”
Claim · model-written summary
Reduced stem growth and leaf area resulted in greater leaf density.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- greater leaf densitiese0
- Direction
- greatere0
- Qualifier
- reduced stem growth and leaf area developmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduced stem growth and leaf area development also caused greater leaf densities—probably a secondary or tertiary effect”
t0“Cotton”
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