New Resistance Gene to Fight P. infestans

Published online: Sep 22, 2020 Articles American Phytopathological Society
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Late blight is the most important pathogen in potato and causes devastation worldwide. The disease, caused by the oomycete Phytophthora infestans, was the trigger of the Irish Famine and still one of the most serious threats to potato production that causes significant economic losses.

"We found that the observed resistance in this wild potato was due to previously uncharacterized novel resistance genes," explained Guangcun Li, one of the scientists involved in the study. "We also discovered that photosynthesis was inhibited to promote the ."

It is a new discovery that photosynthetic inhibition exists in potatoes. However, the scientists also found that the physical barrier of leaves was very important.

"The leaves of this  are hard and show immunity when inoculated with P. infestans at low concentration," said Li.

This research provides new resources for potato  resistance breeding and a new theoretical basis for disease resistance breeding of . To learn more, read "New Findings on the Resistance Mechanism of an Elite Diploid Wild Potato Species JAM1-4 in Response to a Super Race Strain of Phytophthora infestans," published in the August issue of Phytopathology.