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‘Battle cry of the potato’ – How a potato wild relative fights off blackleg and soft rot pathogen

Potato is the most consumed vegetable crop worldwide. However, despite its importance, potato production is severely affected by high susceptibility to a wide range of microbial pathogens, such as bacteria from the genus Pectobacterium, which cause various devastating diseases in potato and produce important economic losses.

Pectobacterium brasiliense is a bacterial pathogen primarily of potato and other vegetables and ornamentals. The earliest reports of the bacterium causing disease were from Brazil in 2004 (El-Tassa and Duarte, 2004). This pathogen was reported for the first time in Europe (Belgium) in 2012 (van der Wolf et al., 2017). Since then, the pathogen has been reported in many regions of the world. There is no evidence of curative measures and varietal resistance (in cultivated potatoes) against this group of bacteria. [Source: CABI]

Even though resistance to Pectobacterium species is limited within cultivated potato varieties, it is known that a potato wild relative (S. chacoense) is resistant to them; however, until recently, the underlying mechanisms of this phenomenon remained unknown.

In a recent study published in the Molecular Plant-Microbe Interactions (MPMI) journal, scientists from Colorado State University (CSU) revealed that metabolites from S. chacoense contribute to disease resistance by altering the pathogenic behavior of Pectobacterium brasiliense, rather than inhibiting its growth or killing it.

“We tested if chemicals extracted from the wild potato affect the behavior of the bacterium and found that these inhibited their ability to produce the enzymes that degrade plant cell walls. The chemicals also intercepted their ability to communicate with each other. To use a battle analogy, the wild potato plant chemicals intercepted the bacteria’s missiles, they cut off their radio communications, and together this encouraged the bacteria to remain friendly neighbors,” explained Adam Heuberger, a CSU Associate Professor involved in the research.

“This wild potato is also resistant to insects, viruses, and fungi. The question is always why, and then how, we can translate this information to improve society. There is much to learn by studying wild relatives of food and ornamental plants,” Heuberger added.

Source: American Phytopathological Society via Original report here
Photo: Potato blackleg symptoms | Ephytia

Lukie Pieterse, Editor and Publisher of Potato News Today

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