致谢：发表此文，使我最难忘的是中国农业科学院生物技术研究所范云六研究员（中国工程院院士）、美国明尼苏达大学Ed. Stadelmann教授及其夫人 O.Y. Lee- Stadelmann博士，还有河北省农林科学院魏建昆、兰巨生两位院长，对我从事这方面研究给予的关心、指导和支持。解放军总医院的顾瑛主任对此文核心观点的提出与形成，给予了极大的支持，并同笔者进行了深刻的讨论。美国纽约城市大学的郑志亮教授、佛罗里达大学的刘国栋博士对文稿进行了认真的审改，并就其中的一些观点和表述方式与我进行了讨论。我的许多同事、朋友从多方面给予了我很大的帮助。在此我向他们表示衷心的感谢。
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作者简介：王海波，河北省石家庄市和平西路598号河北省农林科学院遗传生理研究所，研究员，
E-mail: wanghaibo@cast.org.cn，nkywanghb@yahoo.com.cn