Ostry M E, Moore M
Northern Research Station, St. Paul, MN 55108.
Plant Dis. 2008 Sep;92(9):1336-1338. doi: 10.1094/PDIS-92-9-1336.
Butternut trees (Juglans cinerea) clonally propagated via grafting from source trees with putative resistance to butternut canker were inoculated monthly with two isolates of Sirococcus clavigignenti-juglandacearum in a field planting in Minnesota. Significant differences in resulting canker length were found among (i) month of inoculation, (ii) accession, and (iii) isolate. Results support the suggestion that canker-free butternut occasionally found growing among butternut severely affected by butternut canker potentially have disease resistance and may have value for genetic conservation and restoration of the species. Developing an effective resistance screening technique will require additional information on the natural infection process and testing under various climatic conditions across the range of butternut.
通过嫁接从假定对胡桃溃疡病具有抗性的母树上无性繁殖的白核桃树（Juglans cinerea），于明尼苏达州的一块田间种植地中每月接种两种胡桃球座菌（Sirococcus clavigignenti-juglandacearum）分离株。在（i）接种月份、（ii）种质以及（iii）分离株之间，所产生的溃疡长度存在显著差异。结果支持以下观点：在受胡桃溃疡病严重影响的白核桃林中偶尔发现的无溃疡白核桃树可能具有抗病性，并且对于该物种的遗传保护和恢复可能具有价值。开发一种有效的抗性筛选技术将需要有关自然感染过程的更多信息以及在白核桃分布范围内的各种气候条件下进行测试。
