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Studies on some bacterial diseases of Lupinus termis [electronic resource].

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Abdel-Ghafar, Abeer H

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Language: English Summary language: Arabic Description: p.1-12Other title:

دراسات على بعض الأمراض البكتيرية فى الترمس [Added title page title]

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Minufiya journal of agricultural research, 2007 v. 32 (1) [electronic resource].

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In: Minufiya Journal of Agricultural Research 2007. v.32(1)Summary: The present investigation was carried out to study the effect of Agrobacterium tumefaciens, a soil - borne pathogenic bacteria causing crown - gall disease on lupine plants on plant growth and symbiotic performance of Bradyrhizobium spp. (lupinus) in addition to the nature's biological control of Agrobacterium radiobacter strain k 84. Four isolates of Agrobacterium tumefaciens and two selected isolates of Bradyrhizobium sp. (Lupinus) were isolated , identficated and purificated. Inoculation with lupine rhizobia enhanced in general nodule formation , growth of nodular tissue , dry weight of shoots and total nitrogen on all the tested lupine cultivars. A clear inhibitory effect on nodule formation and their dry weight was observed by inoculation with two spices of Agrobacterium tunefaciens or radiobacter. However, the reduction was more pronounced in the pathogen than that of biocontrol agent. Inoculation with Bradyrhizobium (alone or mixed) and two speices of Agrobacterium led to an increasing of dry weight of shoots , total N-content and seed yield in comparison with pathogen treatment. Serological studies revealed to no dectable rection between two tested organisms (Agrobacterium and Bradyrhizobium )while four common antigenic materials were found to be common between Agrobacterium tumefacies and seed protein of susceptible lupine cultivars (local) , where no common antigen are detected in resistant lupine (foreign). One common precipitin band was found to be common between the Bradyrhizobium sp. (lupine) st. 6 and seed protein of both susceptible and resistant lupin cultivars.

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The present investigation was carried out to study the effect of Agrobacterium tumefaciens, a soil - borne pathogenic bacteria causing crown - gall disease on lupine plants on plant growth and symbiotic performance of Bradyrhizobium spp. (lupinus) in addition to the nature's biological control of Agrobacterium radiobacter strain k 84. Four isolates of Agrobacterium tumefaciens and two selected isolates of Bradyrhizobium sp. (Lupinus) were isolated , identficated and purificated. Inoculation with lupine rhizobia enhanced in general nodule formation , growth of nodular tissue , dry weight of shoots and total nitrogen on all the tested lupine cultivars. A clear inhibitory effect on nodule formation and their dry weight was observed by inoculation with two spices of Agrobacterium tunefaciens or radiobacter. However, the reduction was more pronounced in the pathogen than that of biocontrol agent. Inoculation with Bradyrhizobium (alone or mixed) and two speices of Agrobacterium led to an increasing of dry weight of shoots , total N-content and seed yield in comparison with pathogen treatment. Serological studies revealed to no dectable rection between two tested organisms (Agrobacterium and Bradyrhizobium )while four common antigenic materials were found to be common between Agrobacterium tumefacies and seed protein of susceptible lupine cultivars (local) , where no common antigen are detected in resistant lupine (foreign). One common precipitin band was found to be common between the Bradyrhizobium sp. (lupine) st. 6 and seed protein of both susceptible and resistant lupin cultivars.

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