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ARS Home » Southeast Area » Stuttgart, Arkansas » Dale Bumpers National Rice Research Center » Research » Publications at this Location » Publication #374677

Research Project: Gene Discovery and Crop Design for Current and New Rice Management Practices and Market Opportunities

Location: Dale Bumpers National Rice Research Center

Title: Temperature impacts on the effectiveness of the rice blast resistance gene Ptr

item Jia, Yulin
item Box, Heather
item WANG, XUEYAN - University Of Arkansas
item ZHAO, HAIJUN - Orise Fellow
item WANG, GUO-LIANG - The Ohio State University

Submitted to: National American Phytopathology Meetings
Publication Type: Abstract Only
Publication Acceptance Date: 7/2/2020
Publication Date: 8/3/2020
Citation: Jia, Y., Box, H.N., Wang, X., Zhao, H., Wang, G. 2020. Temperature impacts on the effectiveness of the rice blast resistance gene Ptr. National American Phytopathology Meeting, August 8-12, 2020, Denver, Colorado. Available:

Interpretive Summary:

Technical Abstract: Knowledge on the impact of temperature on the effectiveness of defense responses to the rice fungal pathogen Magnaporthe oryzae that causes rice blast disease is largely unknown. The Ptr gene provides broad-spectrum resistance to most of the predominant rice blast races in the US, except for IE1k. Ptr is predicted to encode two protein isomers with 4 armadillo repeats and different amounts of the Ptr protein that occur between the nucleus and cytoplasm of the plant cell are critical for effective disease resistance. Rapid accumulation of transcripts of the Ptr gene after cold and heat treatments of rice germplasm were observed by other investigators. In the present study, we investigated the disease reactions of rice germplasm containing the Ptr gene treated with low temperature before the infection of blast pathogen M. oryzae. Seedlings at the 3-4 leaf stage of three Ptr containing rice germplasm lines, S/C272, S/C324, S/C353, were subjected to 4°C for 4 hrs. The controls were the same germplasm without temperature treatment. Both treated and control germplasm were inoculated with IE1k. Approximately one day delayed disease development was observed after 4°C treatment in comparison with untreated controls. This result suggests that enhanced resistance to IE1k occurred after seedlings were exposed to 4°C. Progress on disease reaction of rice seedlings with 42°C treatment will be presented.