Date of Award:

5-1962

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Plants, Soils, and Climate

Department name when degree awarded

Botany

Committee Chair(s)

Herman H. Wiebe

Committee

Herman H. Wiebe

Committee

Orson S. Cannon

Committee

Sterling A. Taylor

Abstract

The reduced growth of plants under conditions of moisture stress has been attributed to reduced turgor necessary for cell enlargement and to reduced photosynthesis often found in wilted or moisture stressed plants. Reduced translocation is rarely mentioned as a factor in reduced plant growth under limited moisture. This is rather surprising, since the Münch pressure flow hypothesis would require a turgor pressure gradient between leaves and receiving organs before any translocation of sugars could occur. Such a turgor pressure gradient would be reduced with increasing internal moisture deficit and would appear to become zero when the leaves wilt. If this hypothesis is correct, it is likely that translocation is one of the chief physiological factors limiting growth of plants under conditions of limited moisture. Went (50) has suggested that even under conditions favorable for optimum growth, translocation becomes the factor limiting growth of tomatoes.

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