Association of <i>Eucalyptus globulus</i> leaf anatomy with susceptibility to <i>Teratosphaeria</i> leaf disease

Smith, A. H.; Potts, Brad M.; Ratkowsky, D. A.; Pinkard, EA; Mohammed, CL

doi:10.1111/efp.12395

Cited by 14 publications

(10 citation statements)

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“…Indeed, increased susceptibility to A. psidii in populations originating from wetter areas, where disease risk would be expected to be higher, was also reported in E. cloeziana in Queensland (Lee et al ., ), consistent with preadaptation to precipitation gradients influencing susceptibility at the population level. Such preadaptation could impact susceptibility to specific pathogens and involve constitutive morphological, anatomical or chemical traits (Niinemets, ; Smith et al ., , ; Close et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Comparison of host susceptibilities to native and exotic pathogens provides evidence for pathogen‐imposed selection in forest trees

et al. 2018

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Summary The extent to which spatial structuring of host resistance in wild plant populations reflects direct pathogen‐imposed selection is a subject of debate. To examine this issue, genetic susceptibilities to an exotic and a coevolved native fungal pathogen were compared using two Australian host tree species. Damage to common host germplasm of Corymbia citriodora ssp. variegata (CCV) and Eucalyptus globulus, caused by recently introduced (Austropuccinia psidii) and native (Quambalaria pitereka and Teratosphaeria sp.) pathogens was evaluated in common‐garden experiments. There was significant additive genetic variation within host species for susceptibility to both the exotic and native pathogens. However, susceptibility to A. psidii was not genetically correlated with susceptibility to either native pathogen, providing support for pathogen‐specific rather than general mechanisms of resistance. Population differentiation (QST) for susceptibility to the native pathogens was greater than neutral expectations (molecular FST), arguing for divergent selection. Coupled with lower native, but not exotic, pathogen susceptibility in host populations from areas climatically more prone to fungal proliferation, these findings suggest that pathogen‐imposed selection has contributed directly to a geographic mosaic of host resistance to native pathogens.

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Section: Discussionmentioning

confidence: 99%

Comparison of host susceptibilities to native and exotic pathogens provides evidence for pathogen‐imposed selection in forest trees

et al. 2018

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“…Productivity of "eucalyptus" plantations is affected by defoliation levels higher than 25% in the presence of Pseudoteratosphaeria spp. (Lundquist 1987;Smith et al 2018), reaching up to 75% in some cases (Hunter et al 2009). Consequently, this plant material may serve as an inoculation source to infect healthy leaves.…”

Section: Discussionmentioning

confidence: 99%

Fungal communities in different aged leaves of Eucalyptus microcorys F. Muell

2019

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Brazil is the world's largest producer of "eucalyptus" and its highest number of species in the country is located at the "Floresta Estadual Edmundo Navarro de Andrade" (FEENA). Despite the historic and economic importance of this area, little is known about the fungal community associated with Eucalyptus species at FEENA. Here we evaluated the diversity of saprobic fungi in three different stages of Eucalyptus microcorys F. Muell leaf litter. In addition, we compared the saprotrophic fungal community with endophytic fungi of E. microcorys to assess whether endophytes are also found in the leaf litter. We investigated fungal communities using the particle filtration technique coupled with isolation on two culture media. Fungal isolates were clustered into morphospecies and identified using both morphology and DNA sequences. A total of 2558 fungal isolates were obtained, represented by 48 taxa. We report the following five species for the first time for the American continent:

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“…Different studies have concluded that pathogen resistance and thicker, denser mesophyll tissue were linked together [16,36,37]. The study's data focused on the measured tissue layers' size but not on individual cell sizes and density.…”

Section: Leaf Morphologymentioning

confidence: 99%

“…A high LMA can mean a thicker epidermis or mesophyll layer in leaves [15], contributing to leaf density. Denser leaves with less intracellular space are related to plant resistance to pathogens-tightly packed cells make it harder for a pathogen to advance into the plant's tissue [16].…”

Section: Introductionmentioning

confidence: 99%

Differences in Leaf Morphological Parameters of Pear (Pyrus communis L.) Based on Their Susceptibility to European Pear Rust Caused by Gymnosporangium sabinae (Dicks.) Oerst.

Kārkliņa

Lācis

Lāce

2021

Plants

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European pear rust is an important disease; however, the relationship between its causal pathogen Gymnosporangium sabinae (Dicks.) Oerst. and host Pyrus communis L. is poorly understood. In this study, disease severity was measured, and leaf samples were collected over three years, and their leaf water content; leaf area; leaf mass per area; and epidermis, mesophyll, and vascular tissue width and stomatal density were measured and compared between susceptible and resistant genotypes for each year. Most genotypes either showed consistent disease symptoms or showed no symptoms during the study in terms of their susceptibility. A correlation between disease severity and mesophyll tissue thickness, and stomatal density and differences between several morphological parameters were found depending on the genotype’s susceptibility. The study showed that the following pear morphological traits were stable between the years: water content, leaf mass per area, spongy mesophyll thickness, phloem thickness, and stomatal density. When selecting for breeding, we found that candidates for traits that discern susceptible genotypes from resistant were mesophyll layer width, stomatal density, epidermis width, and xylem tissue width.

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Association of Eucalyptus globulus leaf anatomy with susceptibility to Teratosphaeria leaf disease

Cited by 14 publications

References 50 publications

Comparison of host susceptibilities to native and exotic pathogens provides evidence for pathogen‐imposed selection in forest trees

Comparison of host susceptibilities to native and exotic pathogens provides evidence for pathogen‐imposed selection in forest trees

Fungal communities in different aged leaves of Eucalyptus microcorys F. Muell

Differences in Leaf Morphological Parameters of Pear (Pyrus communis L.) Based on Their Susceptibility to European Pear Rust Caused by Gymnosporangium sabinae (Dicks.) Oerst.

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