Abstract
Seasonal and diurnal changes in pH level and organic acid content in exudate from a cut end made on grapevine Muscat of Alexandria were determined from late February to May 8, 1980. The exudate pH became lower until budbreak with increases of malic and tartaric acids. But the diurnal change in pH did not coincide completely with that in malic acid content.The content of malic acid in exudate rapidly increased following the treatment of calcium cyanamide just after sunset on March 16, but the exudate pH was unchanged. On the other hand, the content of malic acid in exudate was not increased by spraying canes with ethrel just after sunset or covering them with aluminum foil during the day, although the exudate pH declined immediately after those treatments.Diurnal behavior of malic acid content was observed to have the same tendency as CAM plants until budbreak.
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