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The infection process of Moniliophthora perniciosa in cacao

机译：可可豆念珠菌的感染过程

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摘要

The development of the basidiomycete Moniliophthora perniciosa in resistant and susceptible Theobroma cacao genotypes was analysed. The infection process leading to broom formation in shoot apexes was characterized by studying the kinetics of basidiospore germination, mode of penetration and colonization of the pathogen. Both resistant and susceptible cacao genotypes were inoculated with M.perniciosa and kept in the greenhouse for 90days, explants were collected, treated for histological studies and meristematic tissues were observed by electron and light microscopy. Variation in the kinetics of germination between the cacao genotypes was detected 4h after inoculation. The fungal penetration occurred through the star-shaped trichome base, natural openings on the cuticular surface and stomata. Host responses between genotypes were found to be different. Compared with non-infected plants, the swelling of all the stem tissues was evident at 60days after inoculation. In the susceptible genotype, typical symptoms developed and fungal colonization was more intense than in resistant genotypes, which showed little or no fungal colonization. The investigations reported herein provide an important step in understanding the pattern of pre- and post-penetration events of M.perniciosa in cacao genotypes with different levels of resistance to this disease.
机译：分析了耐药和易感可可可可基因型的担子菌Moniliophthora perniciosa的发育情况。通过研究担子孢子萌发的动力学，病原体的渗透模式和定殖，来表征导致芽尖中扫帚形成的感染过程。将耐药和易感的可可基因型都接种了多年生分支杆菌，并在温室中放置了90天，收集了外植体，进行了组织学研究，并通过电子和光学显微镜观察了分生组织。接种4小时后，可可基因型之间的萌发动力学变化被检测到。真菌穿透是通过星形毛状体基部，表皮表面的天然开口和气孔发生的。发现基因型之间的宿主反应是不同的。与未感染的植物相比，接种后60天所有茎组织的肿胀是明显的。在易感基因型中，典型症状的发展和真菌定植比在耐药性基因型中表现得更强烈，而耐药性基因型显示很少或没有真菌定植。本文报道的研究为理解可可基因型对不同疾病的抗药性的多年生支原体穿透之前和之后的事件的模式提供了重要的步骤。

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