前言随着苹果矮化密植栽培的发展,苹果矮化砧木的选育工作日益受到重视。由于砧木选育工作周期长,工作量大,因而掌握适宜的预选指标,对于早期确定预选对象,加快选育进程有很大意义。这样,寻求切实可行的矮化砧木预选指标,也成了许多果树工作者关心的课题。 Preface With the development of apple dwarf dense planting cultivation, apple dwarfing rootstock breeding has received more and more attention. Due to the long working cycle and heavy workload of rootstock breeding, it is of great significance to identify the preselected targets and accelerate the process of breeding in the early stage. In this way, the search for practical indicators of dwarfing rootstock has also become a concern of many fruit tree workers.