...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Forest Pathology >Responses of swamp bay, Persea palustris, and avocado, Persea americana, to various concentrations of the laurel wilt pathogen, Raffaelea lauricola
【24h】

Responses of swamp bay, Persea palustris, and avocado, Persea americana, to various concentrations of the laurel wilt pathogen, Raffaelea lauricola

机译：沼泽湾（Persea palustris）和鳄梨（Persea americana）对不同浓度的月桂枯萎病原体（Raffaelea lauricola）的反应

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Laurel wilt, caused by the fungus Raffaelea lauricola and transmitted by the exotic ambrosia beetle Xyleborus glabratus, has killed members of the Lauraceae plant family throughout the southeast United States. A series of experiments were conducted to examine the effects of inoculum concentration on the development of laurel wilt in swamp bay, Persea palustris, and avocado, Persea americana. In each experiment, host plants were inoculated with aqueous suspensions of 10(2), 10(3), 10(4) or 10(5) conidia of R.lauricola, and plants were rated periodically for external symptom development (wilting and foliar dieback). At the end of experiments, plants were rated for internal symptoms of the disease (discoloration of sapwood) and assayed for R.lauricola on a semi-selective medium. Symptom severity in swamp bay was significantly lower for the 10(2) treatment than at higher (10(3)-10(5)) concentrations, whereas 10(2) and 10(3) conidia caused less disease than 10(4) and 10(5) conidia in avocado. At the lowest inoculum concentration, 67% of the swamp bay plants and 20% of the avocados died by the time the respective experiments were terminated. The pathogen was recovered from a high proportion of the symptomatic sapwood of swamp bay (100%) and avocado (94%), and sapwood discoloration and recovery of R.lauricola from inoculated stems of swamp bay were highly correlated with recovery of the pathogen and symptom development in roots. Clearly, swamp bay and avocado are very sensitive to R.lauricola. The ability of only 100 conidia of this pathogen to kill these hosts suggests that few individuals of X.glabratus or other ambrosia beetles that carry low levels of the pathogen would be sufficient to transmit conidia that infect and lead to disease development. The results are also relevant to the development of disease-tolerant host selections, as they indicate levels of the pathogen appropriate for use in screening plants for disease resistance.
机译：由真菌Raffaelea lauricola引起的月桂枯萎病，是由外来的甲虫Xyleborus glabratus传播的，在美国东南部杀死了月桂科植物家族的成员。进行了一系列实验，研究了接种物浓度对沼泽湾（Persea palustris）和鳄梨（Persea americana）中的月桂枯萎发育的影响。在每个实验中，寄主植物分别接种10.2、10（3），10（4）或10（5）的R.lauricola分生孢子的水悬液，并定期评估植物的外部症状发展（枯萎和叶状）。死）。在实验结束时，对植物的疾病内部症状（边材变色）进行评级，并在半选择性培养基上测定了罗氏乳杆菌。 10（2）处理的沼泽海湾症状严重程度明显低于较高浓度（10（3）-10（5））的情况，而10（2）和10（3）分生孢子引起的疾病少于10（4）和鳄梨中的10（5）分生孢子。在最低接种浓度下，到各自实验终止时，67％的沼泽海湾植物和20％的鳄梨死亡。病原体是从大量有症状的沼泽湾边材（100％）和鳄梨（94％）中回收的，并且从沼泽湾接种茎中边材变色和R.lauricola的回收与病原体的回收高度相关。症状从根源发展。显然，沼泽湾和鳄梨对R.lauricola非常敏感。该病原体只有100个分生孢子能够杀死这些宿主的能力表明，携带低水平病原体的X.glabratus或其他沙棘甲虫很少有人足以传播感染并导致疾病发展的分生孢子。该结果也与耐病宿主选择的发展有关，因为它们表明适合筛选植物抗病性的病原体水平。

著录项

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号