镰状炭疽菌和镰刀菌属导致巴西甘蔗出现红腐症状,Plant Pathology

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镰状炭疽菌和镰刀菌属导致巴西甘蔗出现红腐症状
Plant Pathology ( IF 2.3 ) Pub Date : 2021-06-18 , DOI: 10.1111/ppa.13423
Marileide M. Costa ₁ , Bárbara A. A. S. Silva ₁ , Gláucia M. Moreira ₁ , Ludwig H. Pfenning ₁

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红腐病是甘蔗的一种重要病害，据该作物的主要生产国报道。主要的病原体是镰状炭疽病菌，它会引起红色的内部茎腐病，导致糖的质量和数量损失。虽然在巴西的种植园中已经报道了这种疾病的发生，但该疾病的病因尚未完全了解。我们分离并鉴定了与显示红腐症状的甘蔗植物相关的真菌。在炭疽菌属和镰刀菌属内回收了 30 个分离株并按形态分组。基于来自 ITS、ACT、SOD、GAPDH和EF的 DNA 序列的系统发育分析- 1α，八株被认定为Ç。falcatum（Ñ = 6）和Ç。多食性( n = 2)。22 个分离株属于Fusarium fujikuroi物种复合体，被鉴定为F。糖精( n = 8), F . proliferatum ( n = 3) 和F。马达恩斯( n = 11)。与C 共感染。falcatum和镰刀物种经常被观察到。Ç。falcatum和镰刀菌菌株诱导的内部组织和在甘蔗植物，红腐症状茎腐变红，而枯萎的物种还诱导pokkah奔的症状。Ç。在茎表面观察到有性阶段的plurivorum没有引起茎腐病或叶片症状。本研究的结果阐明了巴西甘蔗红腐病的病原体。正在调查导致红腐病或 pokkah boeng 特定症状发展的条件。

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Colletotrichum falcatum and Fusarium species induce symptoms of red rot in sugarcane in Brazil

Red rot is an important disease of sugarcane, reported from the main producing countries of the crop. The main causal agent is Colletotrichum falcatum, which induces reddish internal stalk rot, resulting in loss of quality and quantity of sugars. While the occurrence of this disease has been reported in plantations in Brazil, the aetiology of the disease is not yet fully understood. We isolated and identified the fungi associated with sugarcane plants showing symptoms of red rot. Thirty isolates were recovered and grouped by morphology within the genera Colletotrichum and Fusarium. Based on phylogenetic analyses of DNA sequences from ITS, ACT, SOD, GAPDH, and EF-1α, eight isolates were identified as C. falcatum (n = 6) and C. plurivorum (n = 2). Twenty-two isolates belonged to the Fusarium fujikuroi species complex and were identified as F. sacchari (n = 8), F. proliferatum (n = 3), and F. madaense (n = 11). Coinfection with C. falcatum and Fusarium species were frequently observed. C. falcatum and Fusarium strains induced reddening of internal tissues and stalk rot in sugarcane plants, symptoms of red rot, while Fusarium species also induced symptoms of pokkah boeng. C. plurivorum, whose sexual stage was observed on the surface of stems, did not induce stalk rot or leaf symptoms. The results obtained in this study clarify the aetiological agents of red rot of sugarcane in Brazil. The conditions that lead to the development of specific symptoms of red rot or pokkah boeng are under investigation.

更新日期：2021-06-18

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