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Abstract

Resistance of Eucalyptus globulus juvenile foliage to Teratosphaeria leaf disease (TLD) damage has been shown to be under genetic control. Constitutive traits of juvenile leaves such as stomatal density (counted with wax on and with wax removed), total phenolics, total leaf wax, leaf mass per area (LMA) and leaf anatomical features were assessed to determine differences between pairs of resistant and susceptible families. Anatomic features assessed included cuticle, epidermis, palisade spongy mesophyll and total leaf thickness, as well as palisade cell size, shape and intercellular airspace. One interprovenance, one intraprovenance and two within-family contrasts were used to compare resistant and susceptible pairs of families of Australian origin. The more resistant families had a significantly higher LMA and smaller percentage airspace compared with susceptible families. It is argued that one of the mechanisms by which E. globulus resists TLD involves the closely packed palisade mesophyll cells that increases LMA and reduces airspace, thereby restricting pathogen spread once infection has occurred.

Item Type:	Article
Authors/Creators:	Smith, AH and Potts, BM and Ratkowsky, DA and Pinkard, EA and Mohammed, CL
Keywords:	Eucalyptus globulus, leaf anatomy, Teratosphaeria leaf disease, susceptibility
Journal or Publication Title:	Forest Pathology
Publisher:	Wiley-Blackwell Verlag GmbH
ISSN:	1439-0329
DOI / ID Number:	https://doi.org/10.1111/efp.12395
Copyright Information:	© 2017 Blackwell Verlag GmbH
Related URLs:	Google Scholar: Potts, BM UTAS Profile: Potts, BM UTAS Profile: Ratkowsky, DA UTAS Profile: Mohammed, CL
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