http://www.cnr.it/ontology/cnr/individuo/prodotto/ID117955
Occurrence of Phytophthora cryptogea on Rhizosphere of Cupressus sempervirens cv Bolgheri in Central Italy (Abstract/Poster in atti di convegno)
- Type
- Label
- Occurrence of Phytophthora cryptogea on Rhizosphere of Cupressus sempervirens cv Bolgheri in Central Italy (Abstract/Poster in atti di convegno) (literal)
- Anno
- 2011-01-01T00:00:00+01:00 (literal)
- Alternative label
Vettraino A.M., Danti R., Pecchioli A., Della Rocca G. (2011)
Occurrence of Phytophthora cryptogea on Rhizosphere of Cupressus sempervirens cv Bolgheri in Central Italy
in Fourth International Workshop on the Genetics of Host-Parasite Interactions in Forestry, Eugene, Oregon, USA, 31 July - 5 August, 2011
(literal)
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- Vettraino A.M., Danti R., Pecchioli A., Della Rocca G. (literal)
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- 1) Vettraino A.M.
1) University of Tuscia, DIPROP, via S. Camillo de Lellis, snc, 01100 Viterbo, Italy (literal)
- Titolo
- Occurrence of Phytophthora cryptogea on Rhizosphere of Cupressus sempervirens cv Bolgheri in Central Italy (literal)
- Abstract
- Cupressus sempervirens L., also known as Italian Cypress, native of the Middle-East and
the eastern part of Mediterranean basin, is currently widely used as a multipurpose tree,
especially in ornamental, forest, and windbreak plantings throughout the Mediterranean
region, and in other areas with similar hot, dry summers and mild, rainy winters. During a
survey carried out in 2009 and 2010 in two young ornamental plantations in Tuscany and
one nursery in Umbria, Italy, blight of the entire canopy and tree mortality of C. sempervirens
cultivar \"Bolgheri\" have been observed, with incidence value about 10%. The
cultivar Agrimed did not show symptoms. Symptoms consisted mainly in sudden yellowing
and subsequent browning of the crown starting from the basal portion. With respect to
the ornamental plantations, symptomatic plants were observed from May to August and
were distributed in scattered groups often near a watershed. A Phytophthora species was
isolated from the rhizosphere of dead plants and dead roots on selective medium PARPH.
Analyses of morphological characteristics of 5-day-old cultures grown on carrot agar
showed a petaloid and sparse aerial mycelium. No clamydospores were observed on carrot
agar. Sporangia were oval to obpyriform with rounded bases, nonpapillate and persistent.
Cultures were heterotallic. Ribosomal DNA (regions ITS1, 5.8S rDNA and ITS2) was
amplified and sequenced and compared with sequences of known Phytophthora species
obtained from GenBank. Morphological and molecular results confirmed this species as
Phytophthora cryptogea.
A pathogenicity test was conducted using two cultivars of C. sempervirens, \"Bolgheri\"
and \"Agrimed,\" growing in pots containing soil inoculated with sterile millet seeds
colonized by two isolates of P. crytpogea. For each P. cryptogea isolate and each host
cultivar a total of 10 plants were treated and 10 plants used as controls. All plants were
flooded for 24 h twice at 2-week intervals. Results of the pathogenicity test confirmed the
different susceptibility of the varieties used. This is the first report of P. cryptogea on C.
sempervirens. (literal)
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