First Report of Onion (Allium cepa) Bulb Rot Caused by Klebsiella pneumoniae, Bacillus safensis and Bacillus pumilus in Iraq
الباحث الأول:
Fatima H. Abd-Alhussain
الباحثين الآخرين:
Sabah L. Alwan
المجلة:
IOP Conference Series: Earth and Environmental Science (EES),
تاريخ النشر:
20 يناير، 2025
مختصر البحث:
This was carried out to detect the main bacterial pathogens causing onion
rot in storage through hot seasons of 2022-2023 for six onion varieties. The results
showed that the highest average of disease index over seasons was 64.28% for white,
var…
This was carried out to detect the main bacterial pathogens causing onion
rot in storage through hot seasons of 2022-2023 for six onion varieties. The results
showed that the highest average of disease index over seasons was 64.28% for white,
variety in winter season, the lowest was 16.6 % for the red imported variety in
summer season. The disease intensity over seasons showed highest average was
38.32% in summer season for yellow variety, while the lowest average was 3.33% in
spring season for of infection severity also revealed that the highest average
percentage was in the spring season for the imported red variety. The disease index
and disease intensity showed highest average were 40.33, and 26.44% respectively
for white local variety, while the lowest average were 3.88, and 6.58% respectively
for red imported variety. Six bacterial isolates were selected depending on the highest
disease index, and molecularly diagnosed, using polymerase chain reaction (PCR).
New bacterial rot disease onion has frequently appeared in many areas of AL-Najaf
province -Iraq. The pathogens of the disease was identified six isolates as (Klebsiella
pneumoniae, Bacillus safensis, and Bacillus pumilus) which known to cause
pulmonary and urinary disease in human and occasionally exist as a harm less
entophyte in plants. To evaluate the pathogenicity, we inoculated onion bulbs. The
finding serve as an alert to plant. The onion plants in the storage could serve as a
reservoir for K. pneumoniae, B. safensis, and B. pumilus. Which might infect human
or animals when conditions are favorable. The new finding not only significant in the
developing control strategy for the new disease in Iraq, but also serve as starting point
for further studies on the harm less of these bacteria in humans and animals.
