Eucalyptus pellita as a source of resistance to rust, ceratocystis wilt and leaf blight

Abstract

-Rust (Puccinia psidii), ceratocystis wilt (Ceratocystis fimbriata) and cylindrocladium leaf blight (Cylindrocladium pteridis) are important diseases of eucalyptus. Planting of resistant genotypes is the most suitable control strategy of forest diseases under field condition. Resistance level of 23 Eucalyptus pellita clones was evaluated by artificial inoculations. Among the inoculated clones, 12 were resistant to rust, 16 to ceratocystis wilt and 12 to cylindrocladium leaf blight, and three of them were resistant to all three diseases. The high intra-specific variability found in this study demonstrates the importance of E. pellita as a disease resistance source to be employed for introgression of novel resistance genes in eucalyptus genetic breeding programs.

Screening of Corymbia and Eucalyptus species for resistance to Calonectria pteridis leaf blight

“…As observed in other species of Eucalyptus under natural infection in the field , in the present study, CLB was also more severe in expanded leaves and the highest percentage of defoliation occurred in the branches of the basal third of the canopy (Fig. 2) as previously found by other authors (Grac ßa et al 2009;Guimarães et al 2010).…”

Host range ofErwinia psidiiand genetic resistance ofEucalyptusandCorymbiaspecies to this pathogen

“…& Alfenas (Alfenas et al, ). These observations suggest that long‐term interspecific breeding in eucalypts may have caused them to have a broad genetic base, leading to high genetic variability (Caixeta, Carvalho, Rosado, & Trugilho, ; Guimarães et al, ). Additionally, such a broad genetic base could be exploited to introgress genes that confer resistance to E. psidii into desirable genotypes from the same species as well as from species of the same genus.…”

“…Eucalyptus nitens has been utilized for cold tolerance (Eldridge, Davidson, Harwood, & Wyk, ), and E. tereticornis can be grown in semiarid climates and produces wood with properties desirable for energy production (Wrege, Higa, & deMoura, ). Eucalyptus brassiana has been used as a source of tolerance to drought (Fonseca et al, ) and E. pellita as a source of resistance to other pathogens, such as Austropuccinia psidii , Calonectria pteridis and Ceratocystis fimbriata (Guimarães et al, ; Mafia, Alfenas, Ferreira, & Binoti, ).…”

“…The . These observations suggest that long-term interspecific breeding in eucalypts may have caused them to have a broad genetic base, leading to high genetic variability (Caixeta, Carvalho, Rosado, & Trugilho, 2003;Guimarães et al, 2010). Additionally, such a broad genetic base could be exploited to introgress genes that confer resistance to E. psidii into desirable genotypes from the same species as well as from spe- Of particular importance within this group of five species are E. cloeziana, which has emerged as one of the most important species for energy mainly due to its high wood density and capacity to fix atmospheric carbon (Vital & Della Lucia, 1986), and E. viminalis, which has been valued for its tolerance to intense cold and frost (Fonseca et al, 2010).…”

Qualidade dos frutos de genótipos de tomateiro do banco de germoplasma de hortaliças da Universidade Federal de Viçosa

“…Sendo assim, os bancos de germoplasma são fontes muito importantes para ampliação da base genética de espécies, pois, por possuírem genótipos coletados em diferentes épocas e regiões do mundo, podem apresentar acessos com características diversas, quando comparados a um determinado genótipo considerado padrão comercial Guimarães et al, 2010;Souza Sobrinho et al, 2010).…”