Plant Physiol.
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Plant Physiology 77:309-312 (1985)
© 1985 American Society of Plant Biologists

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Articles

Osmoregulation in Cotton in Response to Water Stress 1

III. Effects of Phosphorus Fertility

Robert C. Ackerson2

Central Research and Development Department, Experimental Station, E. I. Du Pont de Nemours & Company, Inc., Wilmington, Delaware 19898

Cotton (Gossypium hirsutum) (L.) was grown in a sand and nutrient solution system at two levels of phosphorus (0.5 and 5.0 millimolar). Within each phosphorus treatment, plants were either watered daily or acclimated to water stress by subjection to several water stress cycles.

Stress acclimation increased leaf starch at the low phosphorus level, but not at the high phosphorus level. High phosphorus increased leaf sucrose and glucose concentration in both acclimated and nonacclimated plants, but had little effect on osmotic adjustment or the relationship between turgor and water potential.

In nonacclimated plants, high phosphorus increased both leaf conductance and photosynthesis at high water potentials. In acclimated plants, high phosphorus increased photosynthesis but decreased conductance, thus increasing water use efficiency at the single leaf level.

2 Present address: Agricultural Chemicals, E. I. du Pont de Nemours & Co., Stine-Haskell Laboratory, Newark, DE 19714.

1 Contribution 3533 from the Central Research and Development Department, E. I. du Pont de Nemours & Co., Inc.




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