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首页> 外文期刊>World Journal of Microbiology and Biotechnology >Isolation of entomopathogenic fungi from Northern Thailand and their production in cereal grains
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Isolation of entomopathogenic fungi from Northern Thailand and their production in cereal grains

机译：泰国北部昆虫病原真菌的分离及其在谷物中的生产

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摘要

Spore productivity in six entomopathogenic fungal strains isolated from insect cadavers at four locations in Chiang Mai province was evaluated in five cereal grains: white-rice, wheat, rye, corn and sorghum. According to sequence analysis of the internal transcribed spacer regions of these isolates, they were closely related to Beauveria bassiana (2 isolates), Metarhizium flavoviride (1 isolate), Metarhizium anisopliae (1 isolate), Paecilomyces lilacinus (1 isolate) and Isaria tenuipes (1 isolate). Among all fungal isolates, the maximum amount of spores (530.0 × 109 conidia/g) was yielded P. lilacinus CMUCDMT02 on sorghum grain followed by white-rice (399.3 × 109 conidia/g). Moreover, the highest number of spore in M. flavoviride was 102.8 × 109 conidia/g sorghum whereas white-rice yielded the greatest amount of spore for B. bassiana CMUCDMF03 (141.0 × 109 conidia/g) after 60 days incubation. The fungal growth rate was found highest in corn for all strains and rye showed the lowest with the exception of P. lilacinus CMUCDMT02 among the tested grains. Spore viability was over 80 % for all isolates that had been inoculated for 60 days. Fungal conidia suspension of P. lilacinus obtained highest virulence against Bactrocera spp. at a concentration of 1 × 106 spore/ml. The strains isolated, exhibited good production of conidia suggesting a promising strategy for the mass production of inoculum as biocontrol agents with low production cost.
机译：在清迈省四个地点从昆虫尸体中分离出的六个昆虫病原真菌菌株的孢子生产力用五种谷物（白米，小麦，黑麦，玉米和高粱）进行了评估。根据这些分离物内部转录的间隔区的序列分析，它们与球孢白僵菌（2个分离物），黄杆菌（Metrahizium flavoviride）（1个分离物），金属假单胞菌（Anterhizium anisopliae）（1个分离物），淡紫色拟青霉（Paecilomyces lilacinus）（1个分离物）和Isaria tenuipes（Isaria tenuipes）（ 1个隔离区）。在所有真菌分离物中，最大数量的孢子（530.0×109 分生孢子/ g）产生于高粱谷物上的丁香假单胞菌CMUCDMT02，其次是白米（399.3×109 分生孢子/ g）。此外，黄病毒分枝杆菌中孢子的最高数量为102.8×109 分生孢子/ g高粱，而白米产生的球孢杆菌CMUCDMF03的孢子量最大（141.0×109 分生孢子/ g）。孵育60天后。在所有菌株中，所有菌株中玉米的真菌生长速率最高，而黑麦显示最低，除测试谷物中的淡紫青霉CMUCDMT02外。接种60天的所有分离物的孢子活力均超过80％。丁香假单胞菌的真菌分生孢子悬浮液获得了对芽孢杆菌的最高毒力。浓度为1×106 孢子/ ml。分离出的菌株表现出良好的分生孢子生产，提示了作为生物防治剂以较低的生产成本大规模生产接种物的有前途的策略。

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