دور المواد الكيموحيوية المتراكمة في أنسجة درنات البطاطس أثناء إصابتها بالفطر فيوزاريوم، المسبب لمرض العفن الجاف، في طبيعة العلاقة بين العائل و العامل الممرض

الملخص EN

The present study aimed to investigate the possible role of compounds which accumulate in infected tiszue during its invasion by a facultative (necrotrophic) parasite.

Potato tuber dry rot caused by Fusarium solani was selected as a model for this study.

Blasticidin-S was used as a general protein synthesis inhibitor to block synthesis of all compounds associated with infection.

Since the copmound is highly toxic lo Fusarium, a Blasticidin-S resistant mutant was developed and used.

The response of six potato tuber cultivars to infection by both wild and mutant isolates was tested.

"Spunta" cultivar showed high degree of resistance to the infection where as "Karole" cultivare was highly susceptibile.

Prevention of the synthesis of compounds in the resistant cultivar led to the disappearance of hllpersensitivity reaction and was accompanied with a light infection of slices.

On the other hand, infection of "Karole" cultivar was altered in the presence of Blasticiden-S, especially when tiszue viability was preserved Oy incubation at 2l ْ C).

The flourescent compounds and sesquiterpenoid stress compound (rishitin) were suppressed in tissues treated with Blasticidin-S.