Abstract
During the last several decades, phytotoxic products from many different plant pathogens have been described and their modes of action more or less elucidated (Durbin, 1981). In the case of bacteria, mostly unspecific small molecular weight toxins which cause either chloroses or necroses were studied (Bashan, 1987; Rudolph, 1989). We, for example, investigated the mode of action of phaseolotoxin produced by Pseudomonas syringae pv. phaseolicola (Rasche and Rudolph, 1978). Although we think that some of these Phytotoxins play an important part in disease development, a comprehensive understanding of pathogenesis could not be obtained in the case of leaf spot causing bacteria when the studies were limited to low molecular weight toxins. Thus, many pathovars of Pseudomonas and Xanthomonas species do not produce low molecular weight toxins to our knowledge. In addition, for several pseudomonads toxin-negative mutants have been described which are still able to cause disease (e.g. P.s. pvs. phaseolicola ‘angulata’). This means that two aspects of these diseases are not well understood on a molecular level: the disease causing principle and the mechanism of host specificity.
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Rudolph, K.W.E. et al. (1989). Extracellular Polysaccharides as Determinants of Leaf Spot Diseases Caused by Pseudomonads and Xanthomonads. In: Graniti, A., Durbin, R.D., Ballio, A. (eds) Phytotoxins and Plant Pathogenesis. NATO ASI Series, vol 27. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-73178-5_16
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