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Anatomical and histochemical defence responses induced in juvenile leaves of Eucalyptus globulus and Eucalyptus nitens by Mycosphaerella infection

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Smith, AH and Gill, WM and Pinkard, EA and Mohammed, CL (2007) Anatomical and histochemical defence responses induced in juvenile leaves of Eucalyptus globulus and Eucalyptus nitens by Mycosphaerella infection. Forest Pathology, 37 (6). pp. 361-373. ISSN 1437-4781

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Abstract

The responses of juvenile leaves of two Eucalyptus species, with contrasting susceptibility to infection by Mycosphaerella leaf disease, were compared. The anatomical changes, accumulation of phenolics, suberin, lignin and anthocyanin and the retention of chlorophyll were studied in leaf lesions of varying developmental stages caused by species of Mycosphaerella. Enhanced resistance of Eucalyptus nitens in southern Australia was attributed to the formation of an effective lignified and suberized necrophylactic periderm, to restrict pathogen spread. Leaves of E. nitens contained isobilateral palisade which resulted in both abaxial and adaxial cell division and the initiation of a strong reinforced cellular zone from an early lesion stage. Eucalyptus globulus formed a slower, distorted necrophylactic periderm through hypertrophic changes to existing mesophyll and limited cell divisions of the single adaxial palisade layer. Deposits of lignin and suberin did not occur until later in lesion development, which were not effective in preventing further disease development. From this study it is hypothesized that tolerance of eucalypts to Mycosphaerella pathogens may be associated with constitutive mesophyll density.

Item Type: Article
Journal or Publication Title: Forest Pathology
Page Range: pp. 361-373
ISSN: 1437-4781
Identification Number - DOI: 10.1111/j.1439-0329.2007.00502.x
Additional Information:

The definitive version is available at www.blackwell-synergy.com

Date Deposited: 04 Apr 2008 04:54
Last Modified: 18 Jul 2008 10:43
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