حوراء رزاق ظاهر العبودي

AbstractPotato is an economically important crop,considered the fourth major crop worldwide. However, it hasbeen exposed to many pathogensthat cause significant yield loss. Bacterial soft rotdiseasescaused by Enterobactercloacae isone of the most devastating on potatoes. The pathogenicity test conducted on several bacterial isolates isolated from potato tubers showingsoft rotshowed that 4 of these isolates couldcause disease in potatoes.The size of damaged segments of potato slices ranged between 5.50 and 7.93cm.The isolateH.B1 caused the most significant damage of 7.93 cm of tuber slices.Furthermore, the inoculationwas carried out on 5-week-old potato plants. The bacteria were added through irrigation water at a concentration of 1x106CPU.After 20 days of infection, symptoms of wilting and yellowing were observed on the inoculated plants. The biochemical tests displayed that the bacteria are negative for Gram stain and positive for the catalase test, gelatin liquefaction, starch hydrolysis and facultative aerobic.The nucleotide sequence analysis of 16 S marker results exhibiteda similarityrate of 94%. Thus,isolate H.B1 was recorded in NCBIunder registration number OP936020

حملات تطوعية اغرس الاشجار اعمال انسانية نشاطات طلابية حضور ورشات وندوات وحلقات دراسية