Determination of lytic enzyme activities of indigenous Trichoderma isolates from Pakistan

Brazilian Journal of Microbiology

Saeed Ahmad Asad¹  Ayesha Tabassum¹  Abdul Hameed¹  Fayyaz Ul Hassan¹  Aftab Afzal¹  Sabaz Ali Khan¹  Rafiq Ahmed¹  Muhammad Shahzad¹ 

关键词: lytic enzymes;    mycoparasitic activity;    Rhizoctonia solani;    Trichoderma;   

DOI  :  10.1590/S1517-838246420140787

来源: SciELO

【 摘 要 】

Abstract This study investigated lytic enzyme activities in three indigenous Trichoderma strains namely, Trichoderma asperellum, Trichoderma harzianum and Trichoderma sp. Native Trichoderma strains and a virulent strain of Rhizoctonia solani isolated from infected bean plants were also included in the study. Enzyme activities were determined by measuring sugar reduction by dinitrosalicylic acid (DNS) method using suitable substrates. The antagonists were cultured in minimal salt medium with the following modifications: medium A (1 g of glucose), medium B (0.5 g of glucose + 0.5 g of deactivated R. solani mycelia), medium C (1.0 g of deactivated respective antagonist mycelium) and medium D (1 g of deactivated R. solani mycelia). T asperellum showed presence of higher amounts of chitinases, β-1, 3-glucanases and xylanases in extracellular protein extracts from medium D as compared to medium A. While, the higher activities of glucosidases and endoglucanses were shown in medium D extracts by T. harzianum. β-glucosidase activities were lower compared with other enzymes; however, activities of the extracts of medium D were significantly different. T. asperellum exhibited maximum inhibition (97.7%). On the other hand, Trichoderma sp. did not show any effect on mycelia growth of R. solani on crude extract.

【 授权许可】

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