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Descripción
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| Dutch elm disease (DED), caused by Ophiostoma novo-ulmi, is the most devastating and widespread disease of elms. This fungus causes xylem vessels blockage and cavitation, which ultimately results in the development of a wilt syndrome. On the other hand, xylem dysfunction due to cavitation is the primary effect of abiotic stresses like drought and freeze-thaw. Therefore, in this study we evaluate the interrelation between drought induced cavitation and Ulmus minor Mill. resistance to DED. Four year old seedlings of U. minor, obtained by controlled pollination of resistant (R) and susceptible (S) trees, were artificially inoculated with DED. These seedlings belonged to three types of crossing: RxR, RxS and SxS. Resistance to DED was inherited, and RxR progenies showed a higher resistance level than RxS and SxS ones. Cavitation vulnerability curves and xylem anatomical measurements were evaluated on a subsample of 8 trees per type of crossing. Xylem vulnerability to cavitation was high, around -1 MPa, and did not differ significantly among crosses. Crown wilting percentage, as a result of DED inoculation, and drought induced cavitation did not show any significant interrelation. However, maximum hydraulic conductivity and vessel size distribution were significantly correlated with the susceptibility to DED. These parameters resulted significantly higher in SxS individuals. Other anatomical features (e.g. percentage of grouped vessels and wood density) were also linked to DED resistance mechanisms, and differed significantly between crossing types. Xylem structure of resistant elms seemed to restrict the spread of the pathogen rather than prevent cavitation by air-seeding. | |
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Internacional
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Si |
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Nombre congreso
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International Symposium on Wood Structure in Plant Biology and Ecology |
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Tipo de participación
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960 |
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Lugar del congreso
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Nápoles, Italia |
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Revisores
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Si |
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ISBN o ISSN
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00-0000-000-0 |
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DOI
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Fecha inicio congreso
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17/04/2013 |
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Fecha fin congreso
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20/04/2013 |
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Desde la página
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9 |
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Hasta la página
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9 |
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Título de las actas
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International Symposium on Wood Structure in Plant Biology and Ecology |