Abstract
Regulation of proline accumulation in detached rice leaves was investigated. Under dark conditions, proline content in detached rice leaves remained unchanged 8 h after incubation in distilled water, but increased 2-fold by 24 h. However, proline content did not increase during the entire 24-h incubation period in the light. Cell sap pH did not change at 8 h, but decreased 0.2 units at 24 h after incubation in darkness. No significant decrease in cell sap pH was observed in detached rice leaves incubated in the light. The increase of proline content in ammonium vanadate-treated detached rice leaves was associated with cell sap acidification. However, ammonium chloride also decreased cell sap pH and increased the proline content to some extent. The addition of fusicoccin resulted in an increase in proline content and a decrease in cell sap pH. Although fusicoccin promoted isobutyric acid-induced increase of proline, fusicoccin did not result in further decrease in cell sap pH induced by isobutyric acid. Cycloheximide or cordycepin increased proline content without changing cell sap pH. It is concluded that factors apart from cell sap acidification may also be involved in the regulation of proline accumulation.
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