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

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
url
https://doi.org/10.1094/PDIS-11-19-2302-REView
Published Version

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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