文献类型：会议论文

英文题名：Responses in Acacia to inoculation with rhizobia

作者：Kang, LH Li, SC

第一作者：Kang, LH

通信作者：Kang, LH[1]|[a0005bc1e7490e5ca203d]康丽华;

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Peoples R China

会议论文集：International Workshop on Recent Developments in Acacia Planting

会议日期：OCT 27-30, 1997

会议地点：HANOI, VIETNAM

语种：英文

年份：1997

摘要：Temperate species of Acacia. A. melanoxylon, A. mearnsii, A. implexa and A. dealbata, inoculated with strains of the root-nodule bacteria Rhizobium and Bradyrhizobium spp. ('rhizobia'), were grown in the nursery for 4-6 months in plastic containers of soil. Responses to inoculation (indices of nitrogen fixation) were measured as nodule dry matter (DM), seedling height, seedling DM, nitrogenase activity (acetylene reduction activity - ARA), and the nitrogen content of inoculated and uninoculated plants. Estimates were made of the amount and rate of nitrogen fixation. All 29 strains formed nodules on Acacia host plants and most fixed at least some nitrogen. The best-performing strains increased nodule DM, seedling height, seedling DM and ARA by up to 2.1, 1.1, 2.8 and 7.3 times, respectively, and the differences between the best and poorest strains were statistically significant. Significant differences also occurred between six provenances of four Acacia species in their response to inoculation with selected strains. In A. melanoxylon, the rate of nitrogen fixation (the proportion of total plant nitrogen due to fixed nitrogen) for provenance 17263 was 72.4%, but was only 10.5% for provenance 16358. A. implexa had a rate of 53.4%, but A. mearnsii had a rate of only 10.4%. The shoots of Acacia seedlings contained 76% of the total nitrogen fixed by the plant. It is concluded that, in choosing effective strains for inoculants for lines of Acacia, careful consideration must be given to symbiotic compatibility at both the species and the provenance levels.