Journal article
Resistance of New Zealand Provenance Leptospermum scoparium, Kunzea robusta, Kunzea linearis, and Metrosideros excelsa to Austropuccinia psidii
Plant disease, Vol.104(6), pp.1771-1780
06/2020
PMID: 32272027
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Source: InCites
Abstract
Resistance to the pandemic strain of Austropuccinia psidii was identified in New Zealand provenance Leptospermum scoparium, Kunzea robusta, and K. linearis plants. Only 1 Metrosideros excelsa-resistant plant was found (of the 570 tested) and no resistant plants of either Lophomyrtus bullata or L. obcordata were found. Three types of resistance were identified in Leptospermum scoparium. The first two, a putative immune response and a hypersensitive response, are leaf resistance mechanisms found in other myrtaceous species while 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 spp. 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 plants with leaf, stem, and (in Kunzea spp.) branch tip dieback resistance, 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.
Details
- Title
- Resistance of New Zealand Provenance Leptospermum scoparium, Kunzea robusta, Kunzea linearis, and Metrosideros excelsa to Austropuccinia psidii
- Creators
- Grant R. Smith - The New Zealand Institute for Plant and Food Research LimitedBeccy J. Ganley - The New Zealand Institute for Plant and Food Research LimitedDavid Chagne - The New Zealand Institute for Plant and Food Research LimitedJayanthi Nadarajan - The New Zealand Institute for Plant and Food Research LimitedRanjith N. Pathirana - The New Zealand Institute for Plant and Food Research LimitedJulie Ryan - The New Zealand Institute for Plant and Food Research LimitedElise A. Arnst - Manaaki Whenua – Landcare ResearchRoanne Sutherland - ScionJulia Soewarto - ScionGary Houliston - Manaaki Whenua – Landcare ResearchAlby T. Marsh - The New Zealand Institute for Plant and Food Research LimitedEmily Koot - The New Zealand Institute for Plant and Food Research LimitedAngus J. Carnegie - NSW Department of Primary IndustriesTracey Menzies - Department of Agriculture and FisheriesDavid J. Lee - University of the Sunshine CoastLouise S. Shuey - Department of Agriculture and FisheriesGeoff S. Pegg - Department of Agriculture and Fisheries
- Publication Details
- Plant disease, Vol.104(6), pp.1771-1780
- Publisher
- American Phytopathological Society
- Number of pages
- 10
- Grant note
- RFP18608 / Ministry for Primary Industries, New Zealand C11X1607 / Ministry of Business, Innovation and Employment, New Zealand; New Zealand Ministry of Business, Innovation and Employment (MBIE)
- Identifiers
- 991013176792702368
- Copyright
- © 2020 The American Phytopathological Society.
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article