Research article

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

Vinay K. Varshney , Amit Pandey, Vera Thoss, Arvind Kumar, H.S. Ginwal

Vinay K. Varshney
Chemistry Division, Forest Research Institute, P.O. New Forest, Dehra Dun, 248006, India. Email: varshney2000@yahoo.com
Amit Pandey
Forest Pathology Division, Forest Research Institute, P.O. New Forest, Dehra Dun, 248006, India
Vera Thoss
School of Chemistry, Bangor University, Bangore, United Kingdom
Arvind Kumar
Chemistry Division, Forest Research Institute, P.O. New Forest, Dehra Dun, 248006, India
H.S. Ginwal
Genetics and Tree Propagation Division, Forest Research Institute, P.O. New Forest, Dehra Dun, 248006, India

Online First: October 12, 2011
Varshney, V., Pandey, A., Thoss, V., Kumar, A., Ginwal, H. 2011. Foliar chemical attributes of the hybrid bred from Eucalyptus citriodora x E. torelliana and its parental taxa, and implications for fungal resistance. Annals of Forest Research 55(1): 53-60.


One of the important aspects of hybridization is to understand the interaction 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 labo-ratory bioassays. Concentration of active constituents of the hybrid was higher (monoterpenes- a-pinene, ß-pinene and citronellal, and total phenolics) than either parent or equivalent (ursolic acid) to parent E. torelliana thus suggesting an resistance pattern of hybrid. Beta-pinene, ursolic acid and total phenolics were found to be heritable. The findings suggest a chemical basis for fungal resistance and also indicate that the constituents could be used for screening of the disease resistant progeny in this tree system. 

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  • Vinay K. Varshney
  • Amit Pandey
  • Vera Thoss
  • Arvind Kumar
  • H.S. Ginwal
  • Vinay K. Varshney
  • Amit Pandey
  • Vera Thoss
  • Arvind Kumar
  • H.S. Ginwal