Articles
THE RESPONSE OF GROWTH AND SECONDARY METABOLISM TO MELAMPSORA RUSTS IN FIELD CULTIVATED WILLOW (SALIX) CLONES
Article number
381_97
Pages
679 – 682
Language
Abstract
Occurrence of Melampsora spp. rust and its effect on phytomass production and secondary chemistry in ten clones of Salix myrsinifolia Salisb. were studied.
The frequency index of rust on mature leaves varied significantly between willow clones.
The production of phytomass varied among clones, but there was no relationship between the phytomass production and rust index.
The amount of (+)-catechin, soluble tannic materials and chlorogenic acid was higher in rust-favoured leaves than in leaves of a low rust index.
Salicin and unknown salicylate did not show any significant correlation with the rust index.
The salicortin content correlated negatively with rust intensity.
Salicortin may be the chemical means of defence in willow leaves restricting the spread of rust.
Salicortin could function as a non-toxic pre-existing precursor for the possible post-infectional fungi-inhibitor.
Salicortin is easily decomposed enzymatically (Julkunen-Tiitto & Meier, 1992a) to metabolites, such as 6-HCH and catechol, which probably show antimicrobial and antifungal activities.
The frequency index of rust on mature leaves varied significantly between willow clones.
The production of phytomass varied among clones, but there was no relationship between the phytomass production and rust index.
The amount of (+)-catechin, soluble tannic materials and chlorogenic acid was higher in rust-favoured leaves than in leaves of a low rust index.
Salicin and unknown salicylate did not show any significant correlation with the rust index.
The salicortin content correlated negatively with rust intensity.
Salicortin may be the chemical means of defence in willow leaves restricting the spread of rust.
Salicortin could function as a non-toxic pre-existing precursor for the possible post-infectional fungi-inhibitor.
Salicortin is easily decomposed enzymatically (Julkunen-Tiitto & Meier, 1992a) to metabolites, such as 6-HCH and catechol, which probably show antimicrobial and antifungal activities.
Authors
R. Julkunen-Tiitto, J. Hakulinen, B. Meier
Keywords
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