Gramineous weeds near paddy fields are alternative hosts for the Fusarium graminearum species complex that causes fusarium head blight in rice
Gramineous weeds near paddy fields are alternative hosts for the Fusarium graminearum species complex that causes fusarium head blight in rice
复制标题
稻田附近的禾本科杂草是导致水稻赤霉病的禾谷镰刀菌物种复合体的替代宿主
DOI：
10.1111/ppa.13143
复制
发表时间：
2020-02-06
期刊：
影响因子：
2.7
通讯作者：
Shi, Jianrong
中科院分区：
文献类型：
--
作者：
Dong, Fei;Xu, Jianhong;Shi, Jianrong
本研究的目的是评估潜在的作用，禾本科杂草作为替代主机的禾谷镰刀菌种复合体（FGSC），导致镰刀菌头枯病（FHB）在水稻附近的稻田。2018年8月至10月，在江苏省稻田附近采集了10种禾本科杂草共142个样本。从杂草样品中分离出7个镰刀菌属的145个菌株，其中镰刀菌F. asiaticum最丰富（86.9%），其次是F. fujikuroi（5.5%）、F. proliferatum（2.8%），F.禾谷镰刀菌（F. graminearum）占2.1%;三带镰孢（1.4%）、三带镰孢F. acuminatum（0.7%）和F.拟孢子毛孢（0.7%）。基因型和真菌毒素分析证实，72.2%的F。亚洲分离物是脱氧雪腐镰刀菌烯醇（DON）和3-乙酰脱氧雪腐镰刀菌烯醇（3ADON）的产生者，其余分离物是雪腐镰刀菌烯醇（NIV）的产生者。致病性试验表明，3ADON和NIV两种化学型的F. Asiaticum能引起FHB，但NIV型的致病性显著高于3ADON型。三镰刀菌真菌毒素，DON，NIV和玉米赤霉烯酮，自然发生在杂草样品中的低浓度。总之，这项研究提供了深入了解真菌毒素的生产和侵略性的F。asiaticum分离物。
The objective of this study was to evaluate the potential role of gramineous weeds present near paddy fields as alternative hosts for the Fusarium graminearum species complex (FGSC) that causes fusarium head blight (FHB) in rice. A total of 142 weed samples were collected from 10 gramineous weed species near paddy fields from August to October 2018 in Jiangsu Province, China. Of the 145 isolates of seven Fusarium species isolated from the weed samples, F. asiaticum was the most abundant (86.9%), followed by F. fujikuroi (5.5%), F. proliferatum (2.8%), F. graminearum (2.1%), F. tricinctum (1.4%), F. acuminatum (0.7%), and F. sporotrichioides (0.7%). Genotype and mycotoxin analyses confirmed that 72.2% of F. asiaticum isolates were producers of deoxynivalenol (DON) with 3-acetyl deoxynivalenol (3ADON), and the remainder were nivalenol (NIV) producers. Pathogenicity assays showed that both 3ADON and NIV chemotypes of F. asiaticum could cause FHB in rice, but NIV chemotypes were significantly (p < .05) more aggressive than 3ADON chemotypes. Three Fusarium mycotoxins, DON, NIV, and zearalenone, occurred naturally at low concentrations in the weed samples. Taken together, this study provides insight into the mycotoxin production and aggressiveness of F. asiaticum isolates from gramineous weeds in China.