Turgor Changes with Accelerated Aging of Soybeans1
- David J. Parrish,
- A. Carl Leopold and
- Milford A. Hanna2
If membranes are a primary site of aging in dry seeds, the ability of seeds to develop turgor should be increasingly affected by increasing aging stress, and turgor reduction should be evident immediately upon hydration. We used the Instron Universal Testing Machine to examine the rheological properties of freshly imbibed ‘Wayne’ soybean (Glycine max (L.) Merr.) cotyledons as a measure of turgor characteristics. Turgor reductions by osmotica showed a lowering of the apparent modulus of elasticity (E') in parallel with tissue pressure potential. Turgor reductions were detected following seed aging; such reductions were detectable immediately upon imbibition and were evident after 2 days of accelerated aging stress (41 C and 100% relative humidity), whereas significant reductions in germination and growth appeared only after 3 or 4 days of aging. The experiments illustrate the utilization of rheological properties as measures of turgor and show a lowering of turgor levels in imbibed accelerated-aged soybeans, presumptive evidence for a primary effect on membranes in seed aging.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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