Fruit abscission in macadamia due to husk spot disease

Akinsanmi, Olufemi A., Miles, A.K and Drenth, A. (2016) Fruit abscission in macadamia due to husk spot disease. Acta Horticulturae, 1109 209-214. doi:10.17660/ActaHortic.2016.1109.34

Author Akinsanmi, Olufemi A.
Miles, A.K
Drenth, A.
Title Fruit abscission in macadamia due to husk spot disease
Journal name Acta Horticulturae   Check publisher's open access policy
ISSN 0567-7572
ISBN 9789462611030
Publication date 2016-03-20
Year available 2016
Sub-type Article (original research)
DOI 10.17660/ActaHortic.2016.1109.34
Open Access Status Not Open Access
Volume 1109
Start page 209
End page 214
Total pages 6
Place of publication Leuven, Belgium
Publisher International Society for Horticultural Science
Collection year 2017
Language eng
Formatted abstract
Macadamia is indigenous to Australia. Only two species; M. integrifolia and M. tetraphylla and their interspecific hybrids are considered edible and they constitute the commercial macadamia industry. A fungal pathogen, Pseudocercospora macadamiae, causes husk spot in Australia, resulting in premature fruit abscission giving rise to nuts with low oil content. P. macadamiae is believed to have co-evolved with macadamia and the fungus infects the fruit pericarp (husk) via open stomata and grows intercellularly throughout the parenchymatous tissue where it causes accelerated abscission of immature and mature fruit. Depending on the time of infection, environmental conditions, and cultivar, the time to fruit abscission at the onset of husk spot symptoms may take up to 18 weeks. Factors that break the latency and influence fruit abscission due to P. macadamiae infection are unknown and may be involved in the production of ethylene by the husk tissue and/or abscisic acid by the fungus. Comparison of 18 macadamia genotypes revealed variations to accelerated fruit abscission from husk spot lesions on abscised fruit. This may be related to variation in stomatal abundance in the genotypes. The relationship between kernel maturation, in terms of oil content, fruit abscission in diseased and healthy husk is discussed.
Keyword Ascomycetes
Tree nut
Nut drop, Pseudocercospora
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Queensland Alliance for Agriculture and Food Innovation
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Created: Mon, 04 Apr 2016, 11:48:39 EST by Dr Olufemi Akinsanmi on behalf of Centre for Plant Science