大豆种质资源对SMV3号株系的抗性鉴定

本研究对３４８份大豆种质资源，包括“七五”、“八五”鉴定出的抗源，各地推广品种及国外引进品种，人工汁液摩擦法接种ＳＭＶ３号株系进行抗性鉴定。鉴定结果表明，１１３份资源表现为高抗ＳＭＶ３，占３２．４７％，１１３份表现为中抗，占３２．４７％，１２２份感病，占３５．０６％。抗源主要来自于东北春作大豆区和黄淮海夏作大豆区，本实验南方大豆产区资源抗性较弱。高抗资源主要来源于辽宁、山东、山西、北京以及美国和韩国。不同品种接种后的症状类型不同，表明症状反应是品种与株系互作的结果。国外引进资源接种后顶枯症状较多，表明症状反应和品种的地理来源有一定关系。本文还分析了美国一些抗源对ＳＭＶ３的抗性反应及抗性基因的关系。

IDENTIFICATION THE RESISTANCE OF SOYBEAN GERMPLASM TO SMV3

Three hundred and fourly-eight soybean accessions have been identified for resistance to SMV by inoculation with SMV3, a strong virulent strain in Northeast China. The results showed that 113 accessions were highly resistant to SMV3, account for 32.47 %. 113 accessions were moderately resistant to SMV3, account for 32. 47 %. 122 accessions were susceptible to SMV3, account for 35. 06 %. Resistant accessions were mainly originated from Northeast China and Huang Huaihai areas. There were few resistant accessions from South China in our evaluation. Resistant accessions were mainly from Liaoning, Shandong, Shanxi provinces and Beijing, U. S. and South Korea. Symptoms are different in different varieties when inoculated with the same SMV strain, showing there are interaction between soybean varieties and SMV strains. Top necrosis symptoms were observed in introduced varieties from abroad, indicating symptoms may relate to geographical origin of the accession. Some varieties with known resistance gene introduced from U. S. were identified for the resistance to SMV3 and the relationship of resistance gene between Chinese accessions and U. S. accessions was discussed.