甲霜灵对大豆疫霉野生菌株及突变菌株生长发育影响的细胞学研究  

Cytology studies on effects of metalaxyl on a wild-type isolate and a metalaxyl-resistant mutant of Phytophthora sojae in vitro

作　　者：赵海燕 韩青梅[1] 黄丽丽[1] 陈长卿[1] 左豫虎[2] 康振生[1] 

机构地区：[1]陕西省农业分子生物学重点实验室西北农林科技大学植物保护学院,杨凌712100 [2]黑龙江八一农垦大学植物科技学院,大庆163319

出　　处：《菌物学报》2009年第2期197-204,共8页Mycosystema

基　　金：国家重点基础研究发展规划(No.2002CB111406);教育部长江学者和创新团队发展计划(No.IRT0558);高等学校学科创新引智计划(No.B07049)

摘　　要：本文利用电子显微镜技术研究了内吸性杀菌剂甲霜灵(Metalaxyl)对大豆疫霉Phytophthoras ojae野生菌株和突变菌株的形态学及超微结构的影响。结果表明:不同浓度甲霜灵处理后可导致野生菌株和突变菌株发生一系列不同的变化。低浓度(1μg/mL)处理后,野生菌株在培养基上的生长即可受到抑制,菌丝呈现不规则的肿胀、过度分枝;菌丝细胞壁不规则加厚,菌丝细胞内液泡增加,脂肪粒累积,细胞器排列紊乱,原生质最终坏死。随浓度的升高,野生菌株立即停止生长,菌丝干瘪坏死。而突变菌株只在高浓度(10μg/mL)甲霜灵处理后顶端菌丝出现少量较小的分枝,菌丝细胞壁无增厚现象,但细胞内脂肪粒大量积累,明显高于敏感性菌株;突变菌株在高浓度甲霜灵压力下仍继续生长。The effects of metalaxyl, an acylalanine phenylamide fungicide exhibiting systemic properties, on morphology and ultrastructure of the wild-type isolate and the metalaxyl-resistant mutant ofPhytophthora sojae in vitro were examined by means of electron microscopy techniques. Ultrastructral observations on the wild-type isolate revealed marked alterations at a low concentration of metalaxyl （1μg/mL）, such as uneven growth of hyphae, excessive branching of hyphal tips, cessation of hyphal growth and bulb-like swelling of hyphal tips; mitochondria lost their distinct structures, number and size of vesicles increased, cell walls became thickened and hyphal cytoplasm was seriously degenerated in presence of a high concentration of metalaxyl （10μg/mL） While, hyphae of the metalaxyl-resistant mutant displayed little morphological changes after treatment with the high concentration of metalaxyl （10μg/mL）. Observations indicated hyphal tips just appeared little excessive branching, hyphal cell contained a high number of lipid bodies, but fungal cell walls did not thicken. Hyphae maintained their growth and get across the filter treated with 10μg/mL metalaxyl.

关 键 词：内吸性杀菌剂 超微结构 脂肪粒 

分 类 号：S435.651[农业科学—农业昆虫与害虫防治]