Paenibacillus polymyxa Invades Plant Roots and Forms Biofilms.
Confirmation of Polymyxa graminis as a Vector of Wheat Spindle Streak Mosaic Virus J. T. Slykhuis and D. J. S. Barr Research Scientist, formerly Research Station, Agriculture Canada, Ottawa, Ontario, now Research Station, Agriculture Canada, Summerland, British Columbia VOH 1ZO; and Research Scientist, Biosystematics Research Institute, Agriculture Canada, Ottawa, Ontario K1A 0C6, respectively.
Polymyxa betae is the vector of Beet necrotic yellow vein virus (BNYVV), the causal agent of sugar beet rhizomania disease. Because of the widespread use of cultivars partially resistant to BNYVV, resistance breaking BNYVV isolates have been reported. In order to develop alternative control strategies, we investigated interactions between P. betae and plant defenses. A first set of bioassays.
Polymyxa graminis and P betae Keskin continue to be separated as species only on the basis of their host ranges (Barr, 1988); recent molecular studies suggest that additional criteria may provide bases for their continued separation even if distinct anatomical dif-ferences are lacking (Legreve et al., 1996; Ward and Adams, 1996; Ward et al., 1994). Both species exhib-ited 30 synaptonemal.
Holmes published a classification list of 129 plant viruses. This was expanded and in 1999 there were 977 officially recognized, and some provisional, plant virus species. The purification (crystallization) of TMV was first performed by Wendell Stanley, who published his findings in 1935, although he did not determine that the RNA was the infectious material. However, he received the Nobel.
Polymyxin E or colistin, produced by Paenibacillus polymyxa, is an important antibiotic against Gram-negative pathogens. The objective of this study is to evaluate the effect of starch in fermentation medium on colistin biosynthesis in P. polymyxa. The results indicated that replacement of glucose by starch stimulated colistin production and biosynthesis rate.
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