I was writing on Trichoderma as Biological Control Agent, during last fortnight was going through some literature on biological control agents which says that
Today I shall be writing about this....
Against fungal pathogens, Trichoderma species rely on three major mechanisms viz. mycoparasitism/ hyperparasitism, antibiosis and competition.
i. Mycoparasitism/ Hyperparasitism
One of the most salient characters of the genus Trichoderma is its ability to
parasitize other fungi. Weindling in 1932 for the first time described the biocontrol of R. sol
ani (causing citrus seedling disease) by Trichoderma lignorum to mycoparasitism. Mycoparasitism is a complex process involving tropic growth of the biocontrol agent towards the target
organism, coiling and finally dissolution of the target organism’s cell wall/cell membrane by the activity of enzymes. (Rather than coiling, hyphae of Trichoderma may grow attached
with hyphae of R. solani, form haustoria, which may penetrate host fungal cell to draw nutrients.
In coming posts I shall be further discussing about the
i) Mycoparasitism/ Hyperparasitism ii) Enzymes iii) Antibiosis
iv) Competition and rhizosphere competence v) Siderophore production
vi) Signal Transduction