Foliar-applied DormexTM or thiourea-enhanced proline and biogenic amine contents and hastened breaking bud dormancy in 'Ain Shemer' apple trees.

摘要

The role of hydrogen cyanamide (DormexTM) or thiourea in the acceleration of dormancy breaking in buds of "Ain Shemer" apple (Malus sylvestris, Mill.) trees, and their effects on metabolic changes in the contents of proline and biogenic amines (BAs; tyramine, tryptamine, histamine, methylbutylamine and serotonin) in buds during bud break were assessed. The efficiency of bud break by these compounds was noticed to varying degrees. Breaking bud dormancy was correlated with the early date of bud break, the short duration of flowering, the high percentages of bud break and fruit set, and the high contents of proline and BAs. This finding was positively reflected in the tree's yield. DormexTM was found to be more effective than thiourea; therefore, we recommend using DormexTM for early bud break, short period of flowering and high percentages of bud break and fruit set by regulating the contents of proline and BAs in buds.