那时候大概要算高科技了。好像也只是基础研究。
注意这是杂交，而不是嫁接出来的。那位说嫁接是转基因、
基因整合，能弄出苹果梨杂种的，不具有阅读生物学文献
必备的知识。

Nature 170, 1017 (13 December 1952); doi:10.1038/1701017a0

Pear-Apple Hybrids

M. B. CRANE & E. MARKS

John Innes Horticultural Institution, Bayfordbury, Hertford. Oct. 24.

AT the John Innes Horticultural Institution we have recently raised hybrids between pears and apples; they were obtained in the following way. The occurrence of apomixis in the Pomoide??1, and the high frequency of diploid seedlings, 23 out of 39, in a family of pears we raised from crossing the diploid variety Fertility with the triploid variety Beurre Diel, suggested that they may have been apomictically, or in part apomictically, reproduced. To test this possibility one of us (E. M.) isolated a tree of Fertility, emasculated sixteen flowers and brushed the ovaries over with a 40 p.p.m. solution of beta-naphthoxy-acetic acid. Four flowers were pollinated with the pollen of an unnamed tetraploid variety of apple and twelve with the pollen of the diploid apple Crawley Beauty. Twenty-four hours later the ovaries were again treated with beta-naphthoxy-acetic acid. Three fruits developed from pollination with the tetraploid apple and twelve from pollination with the diploid. Seed content and germination are shown in the following table.