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Selecting cork oak and holm oak trees for stable tolerance to combined drought and Phytophthora cinnamomi stressNARA Subscribed
Using trees tolerant to drought and Phytophthora cinnamomi ( Pc ) infection is the most promising approach to restore Quercus suber and Q. ilex forests under decline. Breeding programs require heritability estimates for tolerance to combined stress. Moreover, the genetic variation underlying genotype-by-environment ( G × E ) interactions in oak tolerance to combined stress has not been explored. We evaluated life expectancy of...
Methyl jasmonate spray for the protection of broad-leaf trees against oomycete and fungal pathogensNARA Subscribed
Methyl jasmonate (MeJA) is a volatile hormone produced by plants in response to stress. Exogenous application of MeJA enhances resistance to pathogens in conifers, but little is known if resistance is also enhanced in broad-leaf trees. This article reports on five independent experiments carried out to determine the preventive and curative effects of MeJA spray in broad-leaf trees in response to relevant pathogens. In Castanea...
Key message The effects of MJ on pine trees are species-specific and trigger a resistant phenotype to the PWN. A more dynamic response of hormones and gene expression in Pinus pinea explains the high resistance to Bursaphelenchus xylophilus of this species. Abstract Knowledge on hormonal and genetic mechanisms of pine trees in response to the pinewood nematode (PWN; Bursaphelenchus xylophilus ) is limited. To describe tree def...
Complexities underlying the breeding and deployment of Dutch elm disease resistant elmsNARA Subscribed
Dutch elm disease (DED) is a vascular wilt disease caused by the pathogens Ophiostoma ulmi and Ophiostoma novo-ulmi with multiple ecological phases including pathogenic (xylem), saprotrophic (bark) and vector (beetle flight and beetle feeding wound) phases. Due to the two DED pandemics during the twentieth century the use of elms in landscape and forest restoration has declined significantly. However new initiatives for elm br...
Resistance breeding of the native elms against Dutch elm disease, caused by the fungus Ophiostoma novo-ulmi Brasier, is a major objective in Europe for the conservation of this tree species. More than 2,500 cuttings of 324 elm clones (Ulmus minor Miller, U. glabra Huds., U. laevis Pall., U. pumila L., U. minor x U. glabra, and U. minor x U. pumila) from eight European countries, planted in several randomized two-block designed...
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