Alar對於葡萄休眠芽及新梢生長之影響

The Effect of Alar on the Dormant Buds and Growing Shoots of Grapes

500-5000 ppm濃度之Alar處理能有效抑制葡萄新梢生長9-15天，嫩梢內ABA含量在處理後迅速增高，然後隨新梢之再生長逐漸降低。在生長季中，Alar處理可以抑制潛伏芽的萌發；但在落葉後，枝條受到一定量低溫之作用，進入被動休眠期之後，萌芽即不再受Alar所抑制。以Alar處理新梢時，顯著降低巨峰葡萄二次結果修剪時潛伏芽之萌發率。是以應考慮降低Alar處理之濃度，並配合栽培管理以免影響潛伏芽的萌發而減產。

Alar treatments at concentrations of 500-5000 ppm resulted in retardance of shoot growth in ”Kyoho” grapevine The abscisic acid content in the young shoot tips increased immediately after dipping them in 500 ppm Alar solution for 10 seconds and then decreased gradually. During the growing season, Alar treatment inhibited the burst of latent buds effectively. Soon after the leaves had fallen. and the shoots exposed to a certain amount of low temperature the bud burst would be no more inhibited by the Alar treatment. Using Alar as a retardant to reduce the excess growth of vines grown in the subtropical region the concentration of Alar has to be lowered, so that the latent buds can resume their growth and bear fruits for second harvest in the year.