http://www.cnr.it/ontology/cnr/individuo/prodotto/ID66751
Avoidance by early flushing: a new perspective on Dutch elm disease research (Articolo in rivista)
- Type
- Label
- Avoidance by early flushing: a new perspective on Dutch elm disease research (Articolo in rivista) (literal)
- Anno
- 2009-01-01T00:00:00+01:00 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Ghelardini L, Santini A. (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Istituto per la Protezione delle Piante - C.N.R. Via Madonna del Piano 10 - 50019 Sesto fiorentino (literal)
- Titolo
- Avoidance by early flushing: a new perspective on Dutch elm disease research (literal)
- Abstract
- have been severely damaged and are still endangered by an alien hypervirulent
pathogen, Ophiostoma ulmi s. l., agent of the Dutch elm disease (DED).
Consequently, several ex situ clone collections have been established throughout
Europe for elm breeding and conservation. In this paper we summarise
the studies carried out within the EU project RESGEN CT96-78, which launched
the EU-coordinated evaluation of these collections. Our aim was to analyse the
variation in timing of bud burst and to acquire basic knowledge on the environmental
control of this adaptive trait in European elms, under the hypothesis
that DED susceptibility is related to spring phenology. The variation in the bud
burst date of European elms among collections and years was explained by a
phenological model assuming that the thermal time required for bud burst decreases
exponentially with increasing chilling during winter down to a level
where chilling requirement is fully met. According to the fitted curves, European
elms have low dormancy and short chilling requirement for dormancy
release. Although no simulation was performed, on the basis of the model applied
we can hypothesise that under climate warming elms would flush earlier
in most of Europe. The bud burst date was directly related to latitude and
elevation in U. minor. The order of bud burst of clones from different origins
was stable among years. The observed geographic trends were largely determined
by differences in chilling requirements that increased with latitude and
elevation. Susceptibility to DED varied greatly within U. minor and was directly
correlated with geographic origin and bud burst date, southern and early flushing
clones showing the least symptoms. Our results suggest that early flushing
represents a mechanism of disease avoidance owing to asynchrony between
hosts susceptible period and time of natural infection by DED vectors (Scolytus).
This escape mechanism, combined with true resistance and avoidance
owing to unattractiveness for the vectors feeding, might be exploited for
breeding DED-resistant clones of indigenous species (literal)
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