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Plant Physiology 83:747-749 (1987)
© 1987 American Society of Plant Biologists

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Environmental and Stress Physiology

Abscisic Acid Accumulation Is Not Required for Proline Accumulation in Wilted Leaves 1

Cecil R. Stewart and Gary Voetberg2

Department of Botany, Iowa State University, Ames, Iowa 50011

Leaves from dark-grown barley (Hordeum vulgare L. var Larker) seedlings grown in the presence and absence of fluridone were used to determine whether or not abscisic acid (ABA) accumulation was necessary for proline to accumulate in wilted tissue. Wilted tissue (polyethylene glycol-treated) leaves from fluridone-grown seedlings did not accumulate ABA but did accumulate proline at a rate that was not different from the non-fluridone-treated leaves. Thus ABA accumulation is not required for wilting-induced proline accumulation in barley leaves. Proline accumulation in wilted leaves from the wilty tomato (Lycopersicon esculentum) mutant, flacca, was compared to that in the wild type, Rheinlands Ruhm. Proline accumulated in wilted leaves from flacca. The rate of accumulation was faster in flacca compared to the rate in the wild type because the wilty mutant wilted faster. ABA accumulated in wilted leaves from the wild type but not in the wilty mutant. This result is a further confirmation that ABA accumulation is not required for wilting-induced proline accumulation. These results are significant in that proline accumulation in barley leaves can be induced independently by any one of three treatments: wilting, ABA, or salt.

2 Present address: Department of Horticulture, University of Missouri, Columbia, MO 65211.

1 Supported by United States Department of Agriculture Competitive grant 85-CRCR-1-1671.




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S. Iyer and A. Caplan
Products of Proline Catabolism Can Induce Osmotically Regulated Genes in Rice
Plant Physiology, January 1, 1998; 116(1): 203 - 211.
[Abstract] [Full Text]


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Copyright © 1987 by the American Society of Plant Biologists