Control of light-induced bean leaf expansion: Role of osmotic potential, wall yield stress, and hydraulic conductivity
✍ Scribed by Elizabeth Volkenburgh; Robert E. Cleland
- Book ID
- 104749432
- Publisher
- Springer-Verlag
- Year
- 1981
- Tongue
- English
- Weight
- 547 KB
- Volume
- 153
- Category
- Article
- ISSN
- 0032-0935
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✦ Synopsis
The role of three turgor-related cellular parameters, the osmotic potential (TJs), the wall yield stress (Y) and the apparent hydraulic conductivity (L'p), in the initiation of light-induced expansion of bean ( P h a s e o l u s vuIgaris L.) leaves has been determined. Although light causes an increase in the total solute content of leaf cells, the water uptake accompanying growth results in a slight increase in 7~. Y is about 4 bar; and is unaffected by light. L'p, as calculated from growth rates and isopiestic measurements of leaf water potential, is only slightly greater in rapidly-growing leaves. The turgor pressure of growing cells is lower than that of the controls by about 35%. We conclude that light does not induce cell enlargement in the leaf by altering any of the above parameters, but does so primarily by increasing wall extensibility.