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Abstract
Imbibitional chilling injury of soybean seeds was studied using light and electron microscopy. Intact seeds were allowed to take up water at 4 C or room temperatures and the ultrastructure of the radicle was examined after hydration. In chilled seeds, mitochondria showed weakly defined envelopes and cristae, in contrast to the well‐formed internal structure in the controls. Nuclei of chilled seeds were irregular in shape. Tannic acid was used as a probe of plasmalemma integrity. Most cells in both chilled and control treatments were able to exclude tannin, indicating that chilling injury effects did not damage the plasma membrane enough to allow passage of molecules of that size.
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