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首页> 外文期刊>Plant Disease >Phylogeny and Pathogenicity of Celoporthe Species from Plantation Eucalyptus in Southern China
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Phylogeny and Pathogenicity of Celoporthe Species from Plantation Eucalyptus in Southern China

机译：中国南方种植植物桉树植物的系统发育和致病性

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The family of Cryphonectriaceae (Diaporthales) includes many important tree pathogens, such as those that cause severe cankers on Eucalyptus trees. Recently, stem canker and cracked bark were observed on 8-year-old Eucalyptus grandis x E. urophylla trees in a plantation in southern China. Fruiting structures typical of Cryphonectriaceae fungi were observed on the surface of the diseased tissues. In this study, the isolated fungi were identified based on DNA sequence analyses and morphological characteristics, and their pathogenicity was tested on three Eucalyptus clones. DNA sequence comparisons of the internal transcribed spacer (ITS) regions (including the intervening 5.8S nrRNA gene), two regions of beta-tubulin (BT2/BT1), and partial translation elongation factor1-alpha (TEF-1 alpha), indicated that these isolates represent Celoporthe syzygii and one previously undescribed species. The undescribed species was also morphologically distinct from the other species of Celoporthe. The new species was described and named C. cerciana sp. nov. The results of this study based on the ITS, BT2/BT1, and TEF-alpha sequences indicated that more than one haplotype was isolated from the same Eucalyptus tree. The findings of a previous study, whereby C. eucalypti was isolated from the same plantation as that of this study, revealed the high species diversity of Celoporthe within a single plantation, which is associated with a single Eucalyptus sp. in southern China. The results further suggested that hybridization may occur between C. syzygii and C. eucalypti. In addition to the Eucalyptus trees, C. syzygii was also isolated from native Melastoma candidum in the same Eucalyptus plantation. The inoculation results showed that these fungi isolated from E. grandis x E. urophylla and M. candidum are pathogenic to all three tested E. grandis hybrid clones. Significant differences in tolerance were observed between the tested Eucalyptus clones, suggesting that disease-tolerant Eucalyptus genotypes can be selected for disease management.
机译：CryphoneastiaCeae（Dioporthales）的家族包括许多重要的树病原体，例如在桉树上引起严重溃疡的那些。最近，在南方南方的一个种植园，在8岁的桉树大X e.尿道树上观察到干溃疡和破裂的树皮。在患病组织的表面上观察到典型的CryphoneastiaCeae真菌的结果结构。在该研究中，基于DNA序列分析和形态特征来鉴定分离的真菌，并在三个桉树克隆上测试它们的致病性。 DNA序列与内部转录的间隔（其）区（包括中间5.8s NRRNA基因）的比较，β-微管蛋白（BT2 / BT1）的两个区域，以及部分翻译伸长因子1-α（TEF-1α），表明这些分离物代表Celophorthe Syzygii和一个以前未描述的物种。未描述的物种也与其他物种不同于其他物种。描述了新物种并命名为C. Cerciana SP。 11月。基于其BT2 / BT1和TEF-α序列的本研究结果表明，从同一桉树树中分离出多于一种单倍型。前一项研究的结果，其中C.桉树与本研究的同一种植园中分离出来，揭示了单一种植园内Celceporthe的高种类多样性，其与单一的桉树SP相关。在中国南方。结果进一步提出，在C. syzygii和C.桉树之间可能发生杂交。除了桉树之外，C. syzygii还从同一桉树种植园的天然血糖瘤Candidum中分离出来。接种结果表明，这些真菌从E. Grandis X E.尿道和M. candidum中分离出来的所有三个测试的E. Grandis杂交克隆都是致病性的。在测试的桉树克隆之间观察到耐受性的显着差异，表明可以选择耐受抗性桉树基因型用于疾病管理。

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  • 来源
    《Plant Disease》 |2018年第10期|共13页
  • 作者

    Wang Wen; Liu QianLi; Li GuoQing; Liu FeiFei; Chen ShuaiFei;

  • 作者单位

    CAF CERC Zhanjiang 524022 Guangdong Peoples R China;

    CAF CERC Zhanjiang 524022 Guangdong Peoples R China;

    CAF CERC Zhanjiang 524022 Guangdong Peoples R China;

    CAF CERC Zhanjiang 524022 Guangdong Peoples R China;

    CAF CERC Zhanjiang 524022 Guangdong Peoples R China;

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  • 正文语种 eng
  • 中图分类 植物保护;
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