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首页> 外文学位 >Factors influencing western gall rust infection on lodgepole pine and the seasonal development of the mycoparasite Scytalidium uredinicola.
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Factors influencing western gall rust infection on lodgepole pine and the seasonal development of the mycoparasite Scytalidium uredinicola.

机译：影响寄主松上西部胆锈病感染的因素以及霉菌Scytalidium uredinicola的季节性发育。

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摘要

Western gall rust caused by Endocronartium harknessii (J. P. Moore) Y. Hiratsuka is common on Pinus contorta Dougl. ex Loud. in western Canada. A study was conducted to determine factors influencing rust infection and seasonal occurrence of the mycoparasite Scytalidium uredinicola Kuhlman et al. Spore viability remained above 90% in both field seasons indicating that pathogen viability does not limit infection. Field shoots elongated to 90%, 95%, and 100% of their final length by the third and fourth week of June, and first week of July, respectively. Susceptibility at these stages was 100%, 60%, and less than 10%, respectively. The decline in spore production and decrease in susceptibility combined to reduce infection once shoots reached 90% of their final length.; The likelihood of S. uredinicola presence increased by a factor of 1.3 for each year of growth and increased by a factor of 2.1 for each 1 cm increase in gall size. The incidence of S. uredinicola was only weakly associated with rust severity in the stand. Scytalidium uredinicola was isolated from the surface of galls and from tissues beneath the periderm throughout the year on galls six years of age or older. Histological study confirmed the presence of S. uredinicola in unruptured sori as early as 24 April 1994. Scytalidium uredinicola reoccurred in the same location over 3 successive sporulating seasons from 1992 to 1994. On parasitized galls, S. uredinicola reduced rust spore germination to 5.5%.; Given that S. uredinicola is active at the beginning of the growing season when lodgepole pine is most likely to be infected by E. harknessii, and that it greatly reduces rust spore viability, its potential as a biological control agent would appear quite great. However, the weak association with rust severity in nature suggests that it may not be an important regulating factor in the pathosystem. Further, failure to establish on young galls may be a significant disadvantage for its use as a biological control agent.
机译： Endocronartium harknessii （J. P. Moore）Y. Hiratsuka引起的西方胆囊锈病在 Contorta Dougl上很常见。前大声。在加拿大西部。进行了一项研究，以确定影响锈菌感染和季节性寄生虫（Scultalidium ureinicola Kuhlman等人）发生锈蚀的因素。在两个田间季节中，孢子的活力都保持在90％以上，这表明病原体的活力并不限制感染。分别在6月的第三周和第四周以及7月的第一周，田间苗长分别达到其最终长度的90％，95％和100％。在这些阶段的磁化率分别为100％，60％和小于10％。一旦芽达到其最终长度的90％，孢子产量的下降和药敏性的下降就可以减少感染。 S的可能性。乌迪尼古拉的出现率每增长1倍，胆gall每增加1厘米，其存在就增加2.1倍。乌迪氏链球菌的发生率与林分锈病严重程度之间的关系很小。 Scytalidium uredinicola 全年从六岁或更老的胆汁中分离出来，从胆囊的表面和在皮下的组织中分离出来。组织学研究证实了 S的存在。早在1994年4月24日，乌拉提尼古拉（italinicola）出现在未破裂的鼻孔中。1992年至1994年，在三个连续的孢子形成季节中，<乌拉提尼（Scytalid uredinicola）在相同的位置再次发生。 uredinicola 将锈菌孢子发芽减少至5.5％。鉴于 S。乌迪尼科拉在生长期开始时很活跃，当时黑松很可能会被 harknessii 感染，并且极大地降低了锈孢子的生存能力，具有潜在的生物防治作用。代理看起来会很棒。然而，自然界中与锈病严重程度的弱关联表明它可能不是病理系统中的重要调节因素。此外，未能在幼虫胆上定殖可能是其用作生物防治剂的重大缺点。

著录项

  • 作者

    Moltzan, Bruce David.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Agriculture Plant Pathology.; Biology Plant Physiology.; Agriculture Forestry and Wildlife.
  • 学位 Ph.D.
  • 年度 1998
  • 页码 117 p.
  • 总页数 117
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物病理学;植物学;森林生物学;
  • 关键词

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