Plant growth promotion antibiotics

Burd, G. T, Dixon, D. G., Ghck, B. R. Plant growth promoting that decrease heavy metal toxicity in plants. Canadian Journal of Microbiology. 2000, V. 46,247-255. Siunova, T. V., Kochetkov, V. V., Boronin, A. M. Effect of ihizosphere bacteria on nickel accumulation by barley plants. Agrochemicals. 2006, K 10,80-84. Mannanov, R. N., Saharova, R. K. Antibiotics produced by Bacillus bacteria. Chemistry of Natural Compounds. 2001, V. 37. J4 2,117-123. 

Since the discovery of penicillin, an enormous number of antibiotic compounds have been isolated. They have found uses both in treatment of human disease and in various aspects of agriculture, including treatment of animal and plant diseases, and as feed additives to promote growth of animals. Some antibiotics such as tylosin were developed specifically for agricultural use. 

As the main surface component of the bacterial cell envelope LPS is thought to contribute to the restrictive Gram-negative membrane permeability, allowing bacterial growth in unfavourable environments such as those that may be encountered within or on plants. The exclusion of antimicrobial substances of plant origin probably contributes to the ability of pathogenic bacteria to parasitize plants. LPS-defective mutants show increased in vitro sensitivity to antibiotics and antimicrobial peptides and the numbers of viable bacteria often decline very rapidly upon introduction into plants. LPS may also promote bacterial adherence to plant surfaces (Newman et al., 2007). 

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