The Adaptation of Trichoderma harzianum T22 Race to Different pH and Salt Concentrations and Its Use in Biological Control of Fusarium oxysporum f.sp. Radicis Lycopersici on Tomato

Authors : Fahri YİĞİT

Pages : 6-10

View : 26 | Download : 21

Publication Date : 2011-12-25

Article Type : Research Paper

Abstract :Trichoderma harzianum insert ignore into journalissuearticles values(T22); used as biological control agent, was performed in culture medium insert ignore into journalissuearticles values(PDA); containing different NaCl ratios to assesment its reaction to salt concentration. T22 was tested in two different pH levels insert ignore into journalissuearticles values(5-8); and five different NaCl concentrations insert ignore into journalissuearticles values(0.25, 0.50, 0.75, 1,0, 1.25 M); to Fusarium oxysporum f. sp. radicis lycopersici insert ignore into journalissuearticles values(FORL); causing crown root rot disease on tomato. At the end of stud-ies, mycelial growth and sporulation of FORL were inhibited by 12.94-54.12 and 85.07-95.14% respec-tively, depending on ascending NaCl concentration. Sporulation was also not observed above 50 M NaCl. T22 performed in ascending NaCl concentrations showed low adaptation to salt stress. The mycelial growth was low inhibited 2.35- 3.54% and sporulation raised up to 0.6-1.5 x105 spor/ ml. The results indi-cated that T22 performed in salt condition has 3.2 % higher ability to control of FORL compared to T22 growth in optimum conditions.
Keywords : Trichoderma harzianum, pH, tuz, adaptasyon, Fusarium oxysporum f sp radicis