水花生病原菌——蕉斑镰刀菌菌株的筛选及其致病性测定  被引量:16

Screening and Pathogenicity Test of Fusarium stoveri Isolated from Alternanthera philoxeroides

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作  者:庄义庆[1] 何东兵[1] 王源超[1] 郑小波[1] 

机构地区:[1]南京农业大学农业部病虫监测与治理重点开放实验室,南京210095

出  处:《中国生物防治》2008年第3期262-266,共5页Chinese Journal of Biological Control

基  金:镇江市科技攻关项目(NY2003011);国家高技术研究发展计划(2006AA10A214);国家科技支撑项目(2006BAD08A18);江苏省高技术项目(BG2007333)

摘  要:蕉斑镰刀菌Fusarium stoveri是从自然界水花生植株上分离的、可致水花生表现萎蔫、地上茎腐烂、叶片上呈现褐色斑或黄化的生防真菌。室内研究表明,蕉斑镰刀菌菌丝生长和产孢的适宜温度范围在25-28℃,多数菌株的最适温度为28℃;菌株间的产孢量有较大差异。在供试菌株中,32-6菌株的产孢量最大;供试的9个蕉斑镰刀菌菌株对水花生均有较强的致病力,但菌株间的致病力有所差异。根据菌株的生长速率、产孢量和致病力等因素,菌株32-6被选为水花生生防菌的优选菌株。采用生产上常见农作物、蔬菜、经济作物及物候上与水花生一致的杂草等42种植物对菌株32-6进行寄主专化性测定,结果表明,蕉斑镰刀菌菌株32-6具有高度的寄主专化性,只对水花生表现出较强的致病性,对其他植物均不致病。Several potential fungal bioherbicidal strains of Fusarium stoveri causing the leaves wither, brown or etiolation and stems rot were isolated from the native Alternanthera philoxeroides. The results revealed the temperature for mycelial growth and conidia production was within range of 25 - 28 ℃with optimum at 28℃. Great difference conidial production and pathogenicity existed among the nine isolates Strain 32-6 displayed the best conidial production, and was selected as the potential bioherbicidal candi- date based on the mycelial growth rate, conidial production and pathogenicity to Alternanthera philoxeroides. The results of host-range tests of the strain 32-6 indicated that the pathogen didn' t infect the 42 tested agricultural crop and weed species.

关 键 词:水花生 蕉斑镰刀菌 致病性 寄主专化性 

分 类 号:S451[农业科学—植物保护] S476.9

 

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