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Bruno M.C.,Research And Innovation Center Fondazione chinery | Bruno M.C.,University of Tuscia | Cottarelli V.,University of Tuscia
Zootaxa | Year: 2011

The taxonomic position and original description of Laophontina sensillata Wells & Rao, 1987 are reviewed based on specimens collected from the interstitial fauna of littoral coral sands of several islands of the Philippines and New Caledonia, and the species is designated as the type species of Fiersiphontina gen. nov. The new genus is proposed based on the total loss of sexual dimorphism in the P3 and P4 exopods, and the sexual dimorphism in P2 exopod. Fiersiphontina is highly adapted to the littoral interstitial habitat of coral sandy beaches, and is related to Laophontina Norman & T. Scott, 1905, Wellsiphontina Fiers, 1991 and Spiniferaphonte Gheerardyn & Fiers, 2007. The shared characteristics that indicate a strong affinity of Fiersiphontina to Spiniferaphonte are the robust, dorsally bent, and strongly sclerotised caudal seta V and the morphology of the genital field. The phylogenetic relationship of Spiniferaphonte and Fiersiphontina is also suggested by the analysis of the last ontogenetic phases of the species of the two genera. We re-describe here the adults of both sexes, describe the last three copepodid stages of Fiersiphontina sensillata (Wells & Rao, 1987) comb. nov., and provide notes on the biogeography of the four related genera, and on the ecology of Fiersiphontina and Spiniferaphonte. Copyright © 2011.

Jarausch W.,AlPlanta IPR | Bisognin C.,Research And Innovation Center Fondazione chinery | Schneider B.,Julius Kuhn Institute | Grando S.,Research And Innovation Center Fondazione chinery | And 2 more authors.
Bulletin of Insectology | Year: 2011

To develop apple proliferation (AP) resistant rootstocks, a breeding program was initiated in 2001 employing apomictic Malus sieboldii and M. sieboldii-derived hybrids as donors of the resistance trait and mainly standard apple rootstock Malus x domestica cv. M9 as donor of agronomic values. Examination of the experimentally inoculated progeny of seven crossings made in 2001 and 2002 over a period of seven to eight years showed that inheritance of resistance differs considerably among the parental lines by yielding between 10 to 55% of resistant offspring. Resistant rootstocks were characterized by poor host properties for the AP phytoplasma. This is evidenced by lower phytoplasma titers in resistant genotypes than in standard stock M9 and by preventing detectable phytoplasma development in the top grafted susceptible cv. Golden Delicious. At the end of the observation period, 80% of the root samples collected from resistant rootstocks tested PCR-negative. Size and productivity of trees grown on resistant rootstocks varied over a wide range. A preliminary pomological evaluation was done on the cv. Golden Delicious which has been grafted as infected scion on the progeny genotypes to test. Comparisons with trees grown on M9 rootstocks indicated that there are genotypes among the offspring examined that fulfill the requirements of commercial apple growing.

Ciccotti A.M.,Research And Innovation Center Fondazione chinery | Bisognin C.,Research And Innovation Center Fondazione chinery | Battocletti I.,Research And Innovation Center Fondazione chinery | Deromedi M.,Research And Innovation Center Fondazione chinery | And 2 more authors.
Bulletin of Insectology | Year: 2011

Apple proliferation (AP) is the most important phytoplasma-associated disease affecting apple in Europe. The failure in controlling this disease by standard means strongly increased the importance of adopting resistant genotypes. About 6000 seedlings were obtained from a breeding programme crossing M. sieboldii, donor of resistance to AP, with standard apple rootstocks (M9 mainly) as donor of agronomic value. Resistance screening showed that the trait was inherited to the progenies and trials are in progress to test the agronomic value of these genotypes. In an additional trial, the response of AP-resistant genotypes to a superinfection with different latent apple viruses was investigated. For this, M. sieboldii-derived first and second generation hybrids were analysed. In summer, three repetitions for each genotype were inoculated with apple chlorotic leaf spot (ACLSV), apple stem grooving (ASGV) and apple stem pitting (ASPV) virus. The two following springs after infection, the presence of the viruses was assessed by ELISA test and virus-specific symptom recording on young leaves. In parallel, the reaction of the plants to infections with Trentino strains of 'Candidatus Phytoplasma mali' was evaluated. AP-susceptible Malus x domestica genotypes were considered as controls. The results confirmed an incidence of the viral infections on Malus sieboldii as it was reported in the past. However, the M. sieboldii hybrids showed a high variability of response ranging from no viral symptoms to severe symptoms. Nevertheless, highly phytoplasma- resistant genotypes which showed no presence of viral superinfections could be identified in these experiments.

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