Plant Physiology 56:394-398 (1975)
© 1975 American Society of Plant Biologists
Articles
Osmoregulation in Cotton Fiber
Accumulation of Potassium and Malate during Growth 1
Rajinder S. Dhindsa2,
Charles A. Beasley and
Irwin P. Ting
a Department of Biology, University of California, Riverside, California 92502
Kinetics and osmoregulation of cotton (Gossypium hirsutum L.) fiber growth (primarily extension) have been studied. Growth is dependent on turgor pressure in the fiber. It is inhibited when a decrease in the water potential of the culture medium due to an addition of Carbowax 6000, equals the turgor pressure of the fiber. Potassium and malate accumulate in the fiber and reach peak levels when the growth rate is highest. Maximum concentrations of potassium and malate reached in the fiber can account for over 50% of the osmotic potential of the fiber. As growth slows down, levels of potassium and malate decrease and turgor pressure declines. Cotton ovules are capable of fixing H14CO3– in the dark, predominantly into malate. Fiber growth is inhibited by the absence of potassium and/or atmospheric CO2. We suggest that potassium and malate act as osmoregulatory solutes and that malate, at least in part, arises from dark CO2 fixation reactions.
2 Present address: Department of Biology, University of Calgary, Calgary, Alberta, Canada T2N 1N4.
1 This work was supported by the Cooperative State Research Service of the United States Department of Agriculture, Project No. 116-15-18.
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