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首页> 外文期刊>Plant Pathology >Infection of mungbean seed by Macrophomina phaseolina is more likely to result from localized pod infection than from systemic plant infection
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Infection of mungbean seed by Macrophomina phaseolina is more likely to result from localized pod infection than from systemic plant infection

机译：菜豆（Macrophomina phaseolina）对绿豆种子的感染更可能是由于局部荚果感染而不是系统植物感染引起的

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摘要

The ubiquitous fungal pathogen Macrophomina phaseolina is best known as causing charcoal rot and premature death when host plants are subject to post-flowering stress. Overseas reports of M. phaseolina causing a rapid rot during the sprouting of Australian mungbean seed resulted in an investigation of the possible modes of infection of seed. Isolations from serial portions of 10 mungbean plants naturally infected with the pathogen revealed that on most plants there were discrete portions of infected tissue separated by apparently healthy tissue. The results from these studies, together with molecular analysis of isolates collected from infected tissue on two of the plants, suggested that aerial infection of aboveground parts by different isolates is common. Inoculations of roots and aboveground parts of mungbean plants at nine temperature x soil moisture incubation combinations and of detached green pods strongly supported the concept that seed infection results from infection of pods by microsclerotia, rather than from hyphae growing systemically through the plant after root or stem infection. This proposal is reinforced by anecdotal evidence that high levels of seed infection are common when rainfall occurs during pod fill, and by the isolation of M. phaseolina from soil peds collected on pods of mungbean plants in the field. However, other experiments showed that when inoculum was placed within 130 mm of a green developing pod and a herbicide containing paraquat and diquat was sprayed on the inoculated plants, M. phaseolina was capable of some systemic growth from vegetative tissue into the pods and seeds.
机译：当寄主植物遭受花后胁迫时，无处不在的真菌病原体Macrophomina phaseolina会引起木炭腐烂和过早死亡。国外有关菜豆分枝杆菌在澳大利亚绿豆种子发芽期间引起快速腐烂的报道导致对种子感染的可能方式进行了调查。从自然感染病原体的10株绿豆植物的连续部分中分离出来，发现在大多数植物上，被感染的组织中有离散的部分被看上去健康的组织隔开。这些研究的结果，以及对从两种植物的感染组织中收集到的分离株的分子分析，表明不同分离株对地上部分的空中感染是常见的。在9种温度x土壤湿度培养组合和分离的绿色豆荚中接种绿豆植物的根和地上部分，强烈支持以下观点：种子感染是由小核菌感染豆荚引起的，而不是由根或茎上通过植物系统生长的菌丝引起的感染。传闻证据表明，荚果灌装过程中发生降雨时，高水平的种子感染是常见的;此外，通过从田间绿豆植物荚果上收集的土壤中分离出菜豆分枝杆菌，也使这一建议得到了加强。但是，其他实验表明，将接种物放在绿色发育中的豆荚内130毫米之内，并将含有百草枯和敌草快的除草剂喷洒到接种的植物上，菜豆分枝杆菌能够从营养组织进入豆荚和种子进行全身生长。

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