Selection of Growth and Bacterial Wilt Resistance in Eucalyptus Interspecific Hybrids

LI Mei1,GAN Si-ming1*,LI Fa-gen1,WU Kun-ming1,WU Ju-ying1,QIAN Rui-guang2,GAN Wen-you2(1.Research Institute of Tropical Forestry CAF,Guangzhou 510520,China;2.Gaoyao Forestry Bureau Guangdong Province,Gaoyao 526100,China)

Eucalyptus interspecific hybrid;Growth;Bacterial wilt;Selection

Selection of growth and bacterial wilt(pathogen Ralstonia solanacearum) resistance was carried out by nursery inoculation and field trial for 81 Eucalyptus interspecific hybrids.Among them,E.urophylla is as the female and the other eight species,e.g.,E.tereticdmis etc,is as the male.Total survival in nursery and field examination varied with male parental species,ranging from 44.4%(E.urophylla×E.saligna) to 74.3%(E.urophylla×E.camaldulensis).For the growth of traits height(H),breast-high-diameter(DBH) and volume(V),differences were at 0.05 or 0.01 level among the hybrids within male parental species,but it is not significant among the male species.For bacterial wilt resistance index(RI) significant differences were found at 0.01 level for both the male species and the hybrids within male species.Thirteen fast-growing and bacterial wilt resistant hybrids were selected out.Mean volume is 101.58%～212.65% of the control(three open-pollinating families of E.urophylla) and mean resistance 123.08% ～ 184.60% of the control indexis.This is valuable for further breeding of fast-growing and bacterial-wilt-resistant clones in Eucalyptus.