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Susceptibility to Melampsora leaf rust of poplar clones from diverse genetic backgrounds: effects on photochemistry and water relations (Articolo in rivista)
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- Label
- Susceptibility to Melampsora leaf rust of poplar clones from diverse genetic backgrounds: effects on photochemistry and water relations (Articolo in rivista) (literal)
- Anno
- 2014-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.5539/jps.v3n2p1 (literal)
- Alternative label
Elena G.1, Fernàndez-Martínez J.1, Zacchini M.2, Moret A.1, Fleck I. 1 (2014)
Susceptibility to Melampsora leaf rust of poplar clones from diverse genetic backgrounds: effects on photochemistry and water relations
in Journal of Plant Studies
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Elena G.1, Fernàndez-Martínez J.1, Zacchini M.2, Moret A.1, Fleck I. 1 (literal)
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- 1 Unitat Fisiologia Vegetal, Departament Biologia Vegetal, Facultat de Biologia, Universitat de Barcelona (UB),
Spain
2 Istituto di Biologia Agroambientale e Forestale-CNR, Italy (literal)
- Titolo
- Susceptibility to Melampsora leaf rust of poplar clones from diverse genetic backgrounds: effects on photochemistry and water relations (literal)
- Abstract
- The selection of resistant genotypes is the most appropriate approach in the prevention of the reduction of
biomass and mortality caused by rust infection in poplar plantations. Thus, it is pertinent that we improve our
understanding of the consequences that this fungal disease has on leaf physiology. Here, we studied the
susceptibility to Melampsora rust in three different poplar clones of commercial interest: Lux clone - Populus
deltoides Batr. (cottonwood) and Luisa Avanzo and Adige clones - both Populus × canadensis Mönch. The most
susceptible clone to the infection was L. Avanzo whereas Lux and especially Adige were only slightly affected.
The propagation of the disease was very rapid in L. Avanzo; their leaves showed a high incidence and severity of
the disease in early and advanced stages of infection as was clearly evidenced by the degree of infection.
Infected leaves of L. Avanzo were shown to have drought impaired water relations during summer as reflected
by the marked decline in the relative water content (RWC). Chlorophyll fluorescence imaging revealed
heterogeneity of the effect of the pathogen in the leaves, and areas with pustules showed low maximum quantum
yield (Fv/Fm) and PSII quantum yield (?PSII) values, indicative of strong photoinhibition. In L. Avanzo, with a
greater pustule density, rust provoked a decline in whole leaf photochemistry as indicated by Fv/Fm and
photochemical reflectance index (PRI) results. Leaf structural parameters were not affected by the disease but
results in L. Avanzo and Lux showed higher leaf mass per area (LMA) and higher leaf density (D) indicating an
adaptation to increasing summer drought. In all clones, the effect of the pathogen was reflected in lower leaf
chlorophyll content. (literal)
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