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首页> 外文期刊>Mycologia >Scanning electron microscopy observations of the interaction between Trichoderma harzianum and perithecia of Gibberella zeae
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Scanning electron microscopy observations of the interaction between Trichoderma harzianum and perithecia of Gibberella zeae

机译：哈茨木霉与玉米赤霉病菌皮膜相互作用的扫描电镜观察

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摘要

Chronological events associated with the interaction between a strain of Trichoderma harzianum, T472, with known biological control activity against: perithecial production of G. zeae, were studied with scanning electron microscopy to investigate the mechanisms of control. Large clusters of perithecia consisting of 5-15 perithecia formed on the autoclaved, mulched wheat straw inoculated with G. zeae alone (control) with an average of 157 perithecia per plate. Small clusters consisting of 3-6 and an average of 15 perithecia per plate perithecia formed on straw that was treated with 71 harzianum. The mature perithecia from straw treated with T. harzianum produced less pigment and were lighter in color than those from the control plates. Furthermore the cells of the outer wall of these perithecia were abnormal in appearance and unevenly distributed across the surface. Immature perithecia were colonized by T. harzianum approximately 15 d after inoculation (dai) with the biocontrol agent and pathogen. Few perithecia were colonized at later stages. The affected perithecia collapsed 21 dai, compared to the perithecia in the control samples that began to collapse 28 dai. Abundant mycelium of T. harzianum was seen on the perithecia of treated samples. Perithecial structures may be resistant to penetration by the mycelium because direct penetration was not observed. Trichoderma harzianum colonized the substrate quickly and out-competed the pathogen, G. zeae.
机译：用扫描电子显微镜研究了具有已知的针对玉米赤霉病菌的生物学控制活性的哈茨木霉T472菌株之间相互作用的年代学事件，以研究控制机制。由5-15个皮膜组成的大皮膜组织形成在高压灭菌的被覆盖的麦秸中，该麦秸单独接种了玉米（对照），平均每盘157个皮膜。小团簇由3-6个小簇组成，每块盘上的皮膜上皮平均有15个皮膜皮，用71 harzianum处理过。来自哈茨木霉（T. harzianum）处理过的稻草的成熟皮膜产生的色素较少，并且颜色较对照板浅。此外，这些周皮的外壁细胞外观异常并且在整个表面上分布不均。用生物防治剂和病原体接种（dai）后约15 d，未成熟的皮膜被哈茨木霉定植。在随后的阶段很少有定皮细胞被定植。相比于开始倒塌28 dai的对照样品中的皮膜，受影响的周围膜塌陷了21 dai。在处理过的样品的皮膜上可见哈茨木霉丰富的菌丝体。周围结构可能抵抗菌丝体的渗透，因为未观察到直接渗透。哈氏木霉迅速地在底物上定殖，并且胜过了病原体玉米（G. zeae）。

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