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首页> 外文期刊>Mycologia >THE PARASITIC RELATIONSHIP BETWEEN PHYLLOSTICTA AMPELICIDA AND VITIS VINIFERA
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THE PARASITIC RELATIONSHIP BETWEEN PHYLLOSTICTA AMPELICIDA AND VITIS VINIFERA

机译：冬虫夏草与葡萄藤的寄生关系

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摘要

Phyllosticta ampelicida, the causal agent of black rot of grape, is one of the most damaging fungal pathogens in viticulture in North America. The interactions of the pathogen with host leaf tissues were studied to better understand the behavior of conidia, appressoria, and subcuticular hyphae, particularly in older leaves that remain symptomless. Pycnidiospores germinated on leaf surfaces within an hour and completed appressorium development within six hours, regardless of leaf age. Younger, still-expanding leaves exhibited disease symptoms as circular necrotic lesions 10-14 d after inoculation. Older leaves that were expanded fully at the time of inoculation did not develop disease symptoms. Fungal growth following penetration from appressoria was limited to the subcuticular region above anticlinal walls of the epidermis and was extensive in younger expanding leaves. Subcuticular growth in older, symptomless leaves was limited to less than 30 mu m from the site of penetration from the appressorium. However, these hyphae were viable, since desiccation of symptomless leaves with paraquat 60 d after inoculation allowed the fungus to grow saprobically and develop pycnidia on the leaf surface, especially over major veins. [References: 28]
机译：楠竹是葡萄黑腐病的病原体，是北美葡萄栽培中最具破坏性的真菌病原体之一。研究了病原体与宿主叶片组织的相互作用，以更好地了解分生孢子，附子和表皮下菌丝的行为，特别是在没有症状的老叶中。不论叶子的年龄如何，钩子孢子在一小时内就会在叶片表面上发芽，并在六个小时内完成了Appressorium的发育。接种后10-14 d，较年轻，仍在扩张的叶片表现出疾病症状，如圆形坏死病灶。接种时完全张开的老叶没有出现疾病症状。从食欲穿透的真菌生长仅限于表皮抗壁上方的表皮下区域，并且在年轻的扩张叶片中广泛分布。从无刺的渗透部位开始，较老的无症状叶片的皮下生长限制在30微米以下。但是，这些菌丝是可行的，因为接种后60 d用百草枯使无症状叶片干燥，可使真菌腐生并在叶片表面（尤其是在大脉上）形成吡虫。 [参考：28]

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