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Articles by Ahmed A. Mahdi
Total Records ( 1 ) for Ahmed A. Mahdi
  Soad A.E. Algam , Ahmed A. Mahdi , Bin Li and Guan Lin Xie
  Tomato (Solanum lycopersicum L.) is one of the world's most widely cultivated vegetable crops. Among the tomato-inflicting diseases, wilt caused by Ralstonia solanacearum (Smith) is a major yield-limiting factor. Management of the disease has been hampered by use of ineffective pesticides and lack of resistant varieties. This study aimed at using two antagonistic bacteria and three chemical inducers to inhibit the disease. The dual-culture technique was used to test the in vitro inhibition of R. solanacearum by two antagonistic bacteria (Paenibacillus polymyxa MB02-1007 and Paenibacillus macerans MB02-992) and three chemical inducers (sodium benzoate, ascorbic acid and isonicotinic acid). The effects of the two antagonistic bacteria and three chemical inducers on control of Ralstonia wilt and promotion of tomato growth were evaluated in pots in a randomized block design under greenhouse conditions. The antagonistic bacteria significantly improved seed germination and seedling vigour of tomato plants. Disease incidence and the population of Ralstonia solanacearum in tomato plants were considerably reduced by the two antagonistic bacteria and the three chemical inducers, singly or in combination, compared to the control. In particular, the combination of antagonistic bacteria with isonicotinic acid at 3 mg mL-1 increased height, fresh and dry weight of tomato plants by more than 89%, while the combination of antagonistic bacteria with sodium benzoate at 40 mg mL-1 or ascorbic acid at 8 mg mL-1 or isonicotinic acid at 3 mg mL-1 inhibited tomato bacterial wilt by more than 72% compared to the control. Overall, this study revealed that chemical inducers, in combination with antagonistic bacteria, have a powerful effect on tomato growth promotion and control of tomato bacterial wilt.
 
 
 
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