Journal Article

Leaf trait dissimilarities between Dutch elm hybrids with a contrasting tolerance to Dutch elm disease

Jaroslav Ďurkovič, Ingrid Čaňová, Rastislav Lagaňa, Veronika Kučerová, Michal Moravčík, Tibor Priwitzer, Josef Urban, Miloň Dvořák and Jana Krajňáková

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 111, issue 2, pages 215-227
Published in print February 2013 | ISSN: 0305-7364
Published online December 2012 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/aob/mcs274
Leaf trait dissimilarities between Dutch elm hybrids with a contrasting tolerance to Dutch elm disease

Show Summary Details

Preview

Background and Aims

Previous studies have shown that Ophiostoma novo-ulmi, the causative agent of Dutch elm disease (DED), is able to colonize remote areas in infected plants of Ulmus such as the leaf midrib and secondary veins. The objective of this study was to compare the performances in leaf traits between two Dutch elm hybrids ‘Groeneveld’ and ‘Dodoens’ which possess a contrasting tolerance to DED. Trait linkages were also tested with leaf mass per area (LMA) and with the reduced Young's modulus of elasticity (MOE) as a result of structural, developmental or functional linkages.

Methods

Measurements and comparisons were made of leaf growth traits, primary xylem density components, gas exchange variables and chlorophyll a fluorescence yields between mature plants of ‘Groeneveld’ and ‘Dodoens’ grown under field conditions. A recently developed atomic force microscopy technique, PeakForce quantitative nanomechanical mapping, was used to reveal nanomechanical properties of the cell walls of tracheary elements such as MOE, adhesion and dissipation.

Key Results

‘Dodoens’ had significantly higher values for LMA, leaf tissue thickness variables, tracheary element lumen area (A), relative hydraulic conductivity (RC), gas exchange variables and chlorophyll a fluorescence yields. ‘Groeneveld’ had stiffer cell walls of tracheary elements, and higher values for water-use efficiency and leaf water potential. Leaves with a large carbon and nutrient investment in LMA tended to have a greater leaf thickness and a higher net photosynthetic rate, but LMA was independent of RC. Significant linkages were also found between the MOE and some vascular traits such as RC, A and the number of tracheary elements per unit area.

Conclusions

Strong dissimilarities in leaf trait performances were observed between the examined Dutch elm hybrids. Both hybrids were clearly separated from each other in the multivariate leaf trait space. Leaf growth, vascular and gas exchange traits in the infected plants of ‘Dodoens’ were unaffected by the DED fungus. ‘Dodoens’ proved to be a valuable elm germplasm for further breeding strategies.

Keywords: Adhesion; atomic force microscopy; gas exchange; leaf mass per area; modulus of elasticity; Ophiostoma novo-ulmi; tracheary element

Journal Article.  7959 words.  Illustrated.

Subjects: Plant Ecology

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.