دراسة خصائص عزلات من أنواع الفطر Alternaria و بيان كفاءتها الأنزيمية المعزولة من أوراق نباتات الزينة

Abstract EN

The isolation, diagnosis, and purification of pathogenic fungi causing leaf stains for a variety of ornamental plants were done.

Two-hundred and ninety nine fungal isolates belonging to several fungal genes were obtained and Alternaria species were selected for experimentation.

The differences in the colonies diameter of Alternaria species were obtained.

A.dianthi2 species isolated from the Gerbera plant achieved the highest diagonal growth of 39.50 mm, the rest of the species were included in their diameter was A.alternata4 34.50 mm, the isolates of A.logipies 31.50 mm and A.radicine 29.50 mm.

Moreover the results from the use of the count Haemocytometer, to calculate the number of spores were, A.alternata5 isolated from the hydra plant scored the highest production of spores 23*104 spore.

To show the effect of the environmental role on the fungal growth, the effected different temperatures on the diameters of the developing fungal colonies was studied.

The best growth of the Alternaria fungi was at 25±2°C that diameter of the colony after 7 days of incubation reached 53.5 mm for isolation A.dianthi3 fungi.

No fungal growth occurred at 45°C for all isolates used in the experiment.