Effect of Plant Growth Regulators and Graftings on Early Fruiting of Apple Seedlings

摘要

For accelerating the apple breeding program, shortening the juvenile phase of seedlings is very important. This study was carried out to develop early fruiting methods using plant growth regulators and graftings in apple seedlings. The effects of plant growth regulators and grafting on shortening of the juvenile phase in apple cross seedlings were evaluated. First blooming and blooming rates of apple seedlings were various on treatments. The treatment of apple seedling grafted onto established 'Fuji'trees was more accelerating flowering than the other treatments. 38% of scions grafted on established 'Fuji' apple tree was flowered in third year after grafting, and 100% of these treatment was flowered in the fourth year. The treatment of apple seedling grafted onto seedling or M.26 rootstock was not flowered in third year after grafting, 30.5% or 33.0% of these treatments was flowered in the fourth year, respectively. Among foliar spray in one year old scions grafted on seedling rootstocks with growth regulators, abscisic acid (1,000 mg-L~(-1)) and daminozide (1,000 mg-L~(-1)) treatments induced flowering 91.8%, 87.5% in the fourth year, respectively.