Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 70, Issue 51, Pages 16135-16145Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.2c06431
Keywords
Pythium oligandrum; elicitin; cell surface receptor; plant resistance
Funding
- National Natural Science Foundation of China [32272495, 31721004, 31801715]
- Natural Science Foundation of Jiangsu Province [BK20220147]
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A novel elicitin, PoEli8, from the mycoparasite Pythium oligandrum was found to enhance plant resistance to the oomycete pathogen Phytophthora capsici by activating plant immune responses.
The mycoparasite Pythium oligandrum is a nonpathogenic oomycete that can boost plant immune responses. Elicitins are microbe-associated molecular patterns (MAMPs) specifically produced by oomycetes that activate plant defense. Here, we identified a novel elicitin, PoEli8, from P. oligandrum that exhibits immunity-inducing activity in plants. In vitro-purified PoEli8 induced strong innate immune responses and enhanced resistance to the oomycete pathogen Phytophthora capsici in Solanaceae plants, including Nicotiana benthamiana, tomato, and pepper. Cell death and reactive oxygen species (ROS) accumulation triggered by the PoEli8 protein were dependent on the plant coreceptors receptor-like kinases (RLKs) BAK1 and SOBIR1. Furthermore, REli from N. benthamiana, a cell surface receptor-like protein (RLP) was implicated in the perception of PoEli8 in N. benthamiana. These results indicate the potential value of PoEli8 as a bioactive formula to protect Solanaceae plants against Phytophthora.
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