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Published in Agron J 82:190-195 (1990)
© 1990 American Society of Agronomy
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Temperature and Mepiquat Chloride Effects on Cotton Canopy Architecture

V. R. Reddy, D. N. Baker and H. F. Hodges*

Dep. Agric. Eng., Clemson Univ., Clemson, SC 29694
USDA-ARS Crop Simulation Res. Unit, Crop Sci. Res. Lab., Mississippi State, MS 39762
Dep. Agronomy, Mississippi State, MS 39762

* Corresponding author.

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 chloride1 (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, temerature- and CO2-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 (m2 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.

Contribution from Dep. Agric. Eng., Clemson Univ., Clemson, SC; USDA-ARS Crop Simulation Res. Unit, Crop Sci. Res. Lab., Mississippi State, MS 39762 and Dep. Agronomy, Mississippi State, MS 39762. Approved for publication by the director of Mississippi State Agric. and For. Exp. Stn. as manuscript no. J-7116.

Received for publication February 13, 1989.


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J. D. Siebert and A. M. Stewart
Influence of Plant Density on Cotton Response to Mepiquat Chloride Application
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S. P. Biles and J. T. Cothren
Flowering and Yield Response of Cotton to Application of Mepiquat Chloride and PGR-IV
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