Resistance in maize (Zea mays) to isolates of Puccinia sorghi from Eastern Australia

Quade, Aurelie and Ash, Gavin J. and Park, Robert F. and Stodart, Benjamin (2021) Resistance in maize (Zea mays) to isolates of Puccinia sorghi from Eastern Australia. Phytopathology, 111 (10). pp. 1751-1757. ISSN 0031-949X


Abstract

The causal agent of maize common rust (CR), Puccinia sorghi, has increased in incidence and severity in Australia in recent years, prompting the assessment of sources of resistance and a preliminary survey of the diversity of P. sorghi populations. The maize commercial hybrids tested carried no resistance to 14 isolates of P. sorghi and had infection types comparable with that of a susceptible check. The resistance gene Rp1_D that remained effective in the United States for 35 years was ineffective against 7 of the 14 isolates. Maize lines carrying known “resistance to Puccinia” (Rp) genes were inoculated with the five isolates considered most diverse based on year of collection (2018 or 2019), location (Queensland or Victoria), and host from which they were isolated (maize or sweet corn). Lines carrying the resistance genes RpG, Rp5, Rp1_E, Rp1_I, Rp1_L, RpGDJ, RpGJF, and Rp5GCJ were resistant to all five isolates and to isolates collected in many agroecological regions. These lines were recommended as donors of effective resistance for maize breeding programs in Australia. Lines carrying no known resistance or resistance genes Rp8_A, Rp8_B, Rp1_J, Rp1_M, Rp7, and Rpp9 (conferring resistance to P. polysora) were susceptible to all five isolates. Differential lines carrying resistance genes Rp1_B, Rp1_C, Rp1_D, Rp1_F, Rp1_K, Rp3_D, or Rp4_A were either resistant or susceptible depending upon the isolate used, showing that the isolates varied in virulence for these genes. Urediniospore production was reduced on adult compared with juvenile plants, presumably due to changes in plant physiology associated with age or the presence of adult plant resistance.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Date Deposited: 02 Feb 2022 05:18
Last Modified: 07 Feb 2022 01:28
Uncontrolled Keywords: Adult Plant Resistance; Differential Set; Disease Control and Pest Management; Disease Resistance; Fungal Pathogens; Host-Parasite Interactions; Infection Type; Maize; Maize Common Rust; Pathogen Diversity; Pathogen Recognition By Plants; Puccinia Sorghi; Resistance Gene; RP Gene; Zea Mays
Fields of Research (2008): 06 Biological Sciences > 0607 Plant Biology > 060704 Plant Pathology
Fields of Research (2020): 31 BIOLOGICAL SCIENCES > 3108 Plant biology > 310805 Plant pathology
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280102 Expanding knowledge in the biological sciences
Identification Number or DOI: https://doi.org/10.1094/PHYTO-11-20-0524-R
URI: http://eprints.usq.edu.au/id/eprint/45709

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