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Discovery of Two Novel Phthalide Phytotoxins from the Wheat Tan Spot Fungal Pathogen Pyrenophora tritici-repentis
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2024-08-30 , DOI: 10.1021/acs.jafc.4c02533 Catherine Rawlinson 1 , Gareth Nealon 2, 3 , Yit Heng Chooi 3 , Richard P Oliver 4 , Caroline S Moffat 1 , Pao Theen See 1
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2024-08-30 , DOI: 10.1021/acs.jafc.4c02533 Catherine Rawlinson 1 , Gareth Nealon 2, 3 , Yit Heng Chooi 3 , Richard P Oliver 4 , Caroline S Moffat 1 , Pao Theen See 1
Affiliation
The Dothideomycete fungal pathogen Pyrenophora tritici-repentis (Ptr) is the causal agent of the tan spot disease of wheat. The proteinaceous necrotrophic effectors ToxA and ToxB are well characterized. A nonproteinaceous effector called ToxC has also been partially characterized. Ptr produces a number of other small molecular weight compounds, but these remain poorly characterized. In this study, two novel compounds, designated ToxE1 and ToxE2, capable of inducing chlorotic symptoms on wheat leaves in a cultivar-specific manner, were purified from Ptr liquid cultures. There is no evidence that these compounds correspond to ToxC. Most isolates produced ToxE1, ToxE2, or both, and both compounds were detected in infected wheat leaves. The structures of both analogues were elucidated by NMR spectroscopy and comprise a phthalide core structure with an amide moiety. We postulate that these compounds have a general phytotoxic effect and may have an ancillary role in disease development.
中文翻译:
小麦褐斑病病原菌白麦核腔菌中发现两种新型苯酞植物毒素
Dothideomycete 真菌病原体Pyrenophora tritici-repentis (Ptr) 是小麦褐斑病的病原体。蛋白质坏死性营养效应子 ToxA 和 ToxB 已得到充分表征。一种称为 ToxC 的非蛋白质效应子也已得到部分表征。 Ptr 产生许多其他小分子量化合物,但这些化合物的特征仍然很少。在这项研究中,从 Ptr 液体培养物中纯化出两种新型化合物,命名为 ToxE1 和 ToxE2,能够以品种特异性方式诱导小麦叶片褪绿症状。没有证据表明这些化合物对应于 ToxC。大多数分离株产生 ToxE1、ToxE2 或两者,并且在受感染的小麦叶子中检测到这两种化合物。两种类似物的结构均通过核磁共振波谱法阐明,并包含具有酰胺部分的苯并呋喃酮核心结构。我们假设这些化合物具有一般的植物毒性作用,并且可能在疾病发展中起辅助作用。
更新日期:2024-09-01
中文翻译:
小麦褐斑病病原菌白麦核腔菌中发现两种新型苯酞植物毒素
Dothideomycete 真菌病原体Pyrenophora tritici-repentis (Ptr) 是小麦褐斑病的病原体。蛋白质坏死性营养效应子 ToxA 和 ToxB 已得到充分表征。一种称为 ToxC 的非蛋白质效应子也已得到部分表征。 Ptr 产生许多其他小分子量化合物,但这些化合物的特征仍然很少。在这项研究中,从 Ptr 液体培养物中纯化出两种新型化合物,命名为 ToxE1 和 ToxE2,能够以品种特异性方式诱导小麦叶片褪绿症状。没有证据表明这些化合物对应于 ToxC。大多数分离株产生 ToxE1、ToxE2 或两者,并且在受感染的小麦叶子中检测到这两种化合物。两种类似物的结构均通过核磁共振波谱法阐明,并包含具有酰胺部分的苯并呋喃酮核心结构。我们假设这些化合物具有一般的植物毒性作用,并且可能在疾病发展中起辅助作用。