美国黑核桃与中国核桃种间杂交优势F_1代无性系类型造林对比试验

Research on Comparative Forestation Tests of Heterosis F_1 Progeny of Juglans nigra and Juglans regia L.Interspecific Hybridization

选择我国引进的美国核桃中东部黑核桃和魁核桃为杂交母本,云南铁核桃为杂交父本,其中魁核桃为母本类型4个,以K1、K2、K3、K4为代号;东部黑核桃为母本的类型6个,以D1、D2、D3、D4、D5、D6为代号,对美国黑核桃与中国核桃种间杂交优势F1代无性系类型进行了造林对比试验(中试)研究。结果表明:以树高和地径生长量为指标分析获得表现优良的为K1、K3、D2、D4、D6无性系类型,其遗传增益显著,经济效益大,且干形通直、分枝角小,且抗寒性(抽干)较强。

Taking imported east-central Juglans nigra and J. major of American walnuts for hybrid female parent, Juglans regia L. for hybrid male parent, wherein the J. major as female type 4, K1, K2, K3, K4 code; east-central Juglans nigra as female type 6 ,D1 ,D2 ,D3 ,D4,135 ,D6 code. Through comparative forestations tests （pilot scale） on Fl progeny,the heterosis clones of Juglans nigra and Juglans regia L. interspecific hybridization, and analysis on tree height and stem base growth were studied. The results showed that K1, K3, D2,134, D6 clones were found due to excellent performance, it showed noticeable genetic gain, considerable economic returns and high resistance to coldness, in straight stem form, small branching angle.