Foliar chemical attributes of the hybrid bred from Eucalyptus citriodora x E. torelliana and its parental taxa, and implications for fungal resistance

• Published in: Annals of forest research 2012-05, Vol.55 (1), p.53-60
• Main Authors: Vinay K. Varshney, Amit Pandey, Vera Thoss, Arvind Kumar, H.S. Ginwal
• Format: Article
• Language: English
• Subjects: Cylindrocladium quinqueseptatum; Eucalyptus citriodora and E. torelliana; foliar chemical attributes; monoterpenes; phenolics; ursolic acid
• ISSN: 1844-8135; 2065-2445

One of the important aspects of hybridization is to understand theinteraction between hybrid plants and the pests and diseases of the parental taxa. The foliar chemical attributes were compared between the hybrid of Eucalyptus citriodora and E. torelliana and its parental taxa. The fungus, Cylindrocladium quinqueseptatum, to which the hybrid and one parent E.torelliana have been observed resistant in the field, was used to examine patterns of resistance in relation to foliar constituents found active in laboratory bioassays. Concentration of active constituents of the hybrid was higher (monoterpenes- α-pinene, β-pinene and citronellal, and total phenolics)than either parent or equivalent (ursolic acid) to parent E. torelliana thus suggesting an resistance pattern of hybrid. β-pinene, ursolic acid and total phenolics were found to be heritable. The findings suggest a chemicalbasis for fungal resistance and also indicate that the constituents could be used for screening of the disease resistant progeny in this tree system.