Resistance of New Zealand provenance Leptospermum scoparium, Kunzea robusta, Kunzea linearis and Metrosideros excelsa to Austropuccinia psidii

Grant R Smith; Beccy J Ganley; David Chagne; Jayanthi Nadarajan; Ranjith N Pathirana; Julie Ryan; Elise A Arnst; Roanne Sutherland; Julia Soewarto; Gary Houliston; Alby T Marsh; Emily Koot; Angus Carnegie; Tracey Menzies; David J Lee; Louise S Shuey; Geoff S Pegg

doi:10.1094/PDIS-11-19-2302-RE

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Resistance of New Zealand provenance Leptospermum scoparium, Kunzea robusta, Kunzea linearis and Metrosideros excelsa to Austropuccinia psidii

Journal article

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Resistance of New Zealand provenance Leptospermum scoparium, Kunzea robusta, Kunzea linearis and Metrosideros excelsa to Austropuccinia psidii

Grant R Smith, Beccy J Ganley, David Chagne, Jayanthi Nadarajan, Ranjith N Pathirana, Julie Ryan, Elise A Arnst, Roanne Sutherland, Julia Soewarto, Gary Houliston, …

Plant Disease, Vol.104(6), pp.177-1780

2020

DOI: https://doi.org/10.1094/PDIS-11-19-2302-RE

PMID: 32272027

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Abstract

cultivar resistance, disease development and spread, disease

management, epidemiology, fungi, k anuka, m anuka, Myrtaceae, ornamentals,

pandemic strain, p ohutukawa, ramarama, rawiri m anuka, r ohutu, trees,

woody ornamentals

Resistance to the pandemic strain of Austropuccinia psidii was identified in New Zealand provenance Leptospermum scoparium, Kunzea robusta and Kunzea linearis plants. Only one Metrosideros excelsa resistant plant was found (of the 570 tested) and no resistant plants of either Lophomyrtus bullata or Lophomyrtus obcordata were found. Three types of resistance were identified in L. scoparium. The first two, a putative immune response and a hypersensitive response, are leaf resistance mechanisms found in other myrtaceous species, whilst on the lateral and main stems a putative immune stem resistance was also observed. Both leaf and stem infection were found on K. robusta and K. linearis plants as well as branch tip dieback that developed on almost 50% of the plants. L. scoparium, K. robusta and K. linearis are the first myrtaceous species where consistent infection of stems has been observed in artificial inoculation trials. This new finding and the first observation of significant branch tip dieback of plants of the two Kunzea species resulted in the development of two new myrtle rust disease severity assessment scales. Significant seed family and provenance effects were found in L. scoparium, K. robusta and K. linearis: some families produced significantly more leaf, stem (and in Kunzea branch tip dieback) resistant plants, and provenances provided different percentages of resistant families and plants. The distribution of the disease symptoms on plants from the same seed family, and between plants from different seed families, suggested that the leaf, stem and branch tip dieback resistances were the result of independent disease resistance mechanisms.

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Title: Resistance of New Zealand provenance Leptospermum scoparium, Kunzea robusta, Kunzea linearis and Metrosideros excelsa to Austropuccinia psidii
Authors: Grant R Smith (Author) - New Zealand Institute for Plant and Food Research Limited, New Zealand
Beccy J Ganley (Author) - New Zealand Institute for Plant and Food Research Limited, New Zealand
David Chagne (Author) - New Zealand Institute for Plant and Food Research Limited, New Zealand
Jayanthi Nadarajan (Author) - New Zealand Institute for Plant and Food Research Limited, New Zealand
Ranjith N Pathirana (Author) - New Zealand Institute for Plant and Food Research Limited, New Zealand
Julie Ryan (Author) - New Zealand Institute for Plant and Food Research Limited, New Zealand
Elise A Arnst (Author) - Manaaki Whenua Landcare Research, New Zealand
Roanne Sutherland (Author) - Scion, New Zealand
Julia Soewarto (Author) - Scion, New Zealand
Gary Houliston (Author) - Manaaki Whenua Landcare Research, New Zealand
Alby T Marsh (Author) - New Zealand Institute for Plant and Food Research Limited, New Zealand
Emily Koot (Author) - New Zealand Institute for Plant and Food Research Limited, New Zealand
Angus Carnegie (Author) - Forest Science
Tracey Menzies (Author) - Queensland Department of Agriculture and Fisheries
David J Lee (Author) - University of the Sunshine Coast
Louise S Shuey (Author) - Queensland Department of Agriculture and Fisheries
Geoff S Pegg (Author) - Queensland Department of Agriculture and Fisheries
Publication details: Plant Disease, Vol.104(6), pp.177-1780
Publisher: American Phytopathological Society
Date published: 2020
DOI: 10.1094/PDIS-11-19-2302-RE
ISSN: 0191-2917; 1943-7692; 0191-2917
PMID: 32272027
Organisation Unit: Tropical Forests and People Research Centre; University of the Sunshine Coast, Queensland; Forest Industries Research Centre; Forest Research Institute
Language: English
Record Identifier: 99451420402621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Plant Sciences

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