اثر پرتودهی گاما بر تندش اسپور و رشد میسلیوم جدایه‌های Penicillium digitatum و P. italicum

Citrus is one of the most economically important fruits in the world. Post-harvest fungal pathogens can damage to the fruits and. Penicillium digitatum and P. italicum are the two most important fungal pathogens causing fruit rot and economically reduce the yield in the world. Gamma irradiation has been proven detrimental to plant pathogenic fungi. The study was conducted as completely randomize design for factorial experiments. Five gamma irradiation doses including 0 (control), 200, 500, 800 and 1200 Gy were considered to evaluate the effect of gamma irradiation doses on spore germination and mycelial growth of the two main citrus post-harvest pathogens under laboratory condition. Results of the study showed a significant difference (P ≥ 0.05) between spore germination and gamma irradiation dose, so that with increasing gamma irradiation dose, spore germination decreased and dropped below 5.5 % at doses higher than 800 Gy. The effect of irradiation doses and fungal isolates showed a significant difference (P ≥ 0.05) on mycelial growth of the fungal isolates at one and three days after irradiation, but over post irradiation time, the difference decreased while no significant difference was observed on the sixth day after irradiation. Generally, based on the results of this study, the control effect of gamma irradiation on the spore germination of the studied isolates was evaluated as favorable and on their mycelial growth (due to the ability to recover the growth of the spore over time) as unfavorable.