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RESEARCH PRODUCT
Phytophthora Root and Collar Rot of Paulownia, a New Disease for Europe
Federico SpadaR. FaeddaSalvatore MoriccaMario RioloFrancesco AloiSanta Olga CacciolaElena SantilliAntonella PaneGaetano Bentivengasubject
Phytophthora heterosporaphPhytophthora palmivoraPaulowniacomplex mixturesPaulownia elongataRoot rotDNA sequencing; phpathogenicityDNA sequencingQK900-989Plant ecologyBiomass and timber DNA sequencing Nursery plants Pathogenicity Paulownia elongata × P. fortunei Phylogenetic analysis Phytophthora heterospora Phytophthora nicotianae Phytophthora palmivora Princess tree Tree of lifeRhizospherePaulownia elongata × P. fortuneibiologyprincess tree; tree of life; Phytophthora nicotianae; Phytophthora palmivora; Phytophthora heterospora; DNA sequencing; phylogenetic analysis; managed plantings; biomass and timber; nursery plants; pathogenicityphylogenetic analysis<i>Phytophthora palmivora</i>fungiSettore AGR/12 - Patologia Vegetalefood and beveragesForestryPhytophthora nicotianaePhytophthora palmivoraPhytophthora nicotianaebiology.organism_classification<i>Phytophthora heterospora</i>Horticulturetree of lifeCollar rot<i>Phytophthora nicotianae</i>princess treePhytophthoraprincess tree; tree of life; <i>Phytophthora nicotianae</i>; <i>Phytophthora palmivora</i>; <i>Phytophthora heterospora</i>; DNA sequencing; phylogenetic analysis; <i>Paulownia elongata</i> × <i>P. fortunei</i>; biomass and timber; nursery plants; pathogenicitydescription
Paulownia species are fast growing trees native to China, which are being grown in managed plantings in several European countries for the production of wood and biomasses. In 2018, wilting, stunting, leaf yellowing, and collapse, as a consequence of root and crown rot, were observed in around 40% of trees of a 2-year-old planting of Paulownia elongata × P. fortunei in Calabria (Southern Italy). Two species of Phytophthora were consistently recovered from roots, basal stem bark, and rhizosphere soil of symptomatic trees and were identified as Ph. nicotianae and Ph. palmivora on the basis of both morphological characteristics and phylogenetic analysis of rDNA ITS sequences. Koch’s postulates were fulfilled by reproducing the symptoms on potted paulownia saplings transplanted into infested soil or stem-inoculated by wounding. Both Phytophthora species were pathogenic and caused root rot and stem cankers. Even though P. palmivora was the only species recovered from roots of naturally infected plants, in pathogenicity tests through infested soil P. nicotianae was more virulent. This is the first report of Phytophthora root and crown rot of a Paulownia species in Europe. Strategies to prevent this emerging disease include the use of healthy nursery plants, choice of well-drained soils for new plantations, and proper irrigation management.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-11-30 | Forests; Volume 12; Issue 12; Pages: 1664 |