Xylem Fluids of White Lupin (Lupinus albus) Cultivars Susceptible and Resistant to Fusarium oxysporum f. sp. Lupini Race 3 |
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Authors: | B Salleh H Owen |
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Institution: | Baharuddin bin;Salleh, School of Biological Sciences, Universiti Sains Malaysia, Penang (Malaysia). Harold;Owen. Department of Agricultural Botany, University of Reading, Plant Science Laboratories, Whiteknights, Reading, Berks., RG6 2AS (U.K.). |
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Abstract: | Xylem fluids from white lupin cv. Neuland, susceptible to wilt causes by Fusarium oxysporum f. sp. lupini , promoted germination of conidia and chlamydospores of he pathogen, and the production of micro-conidia, to a greater extent than did xylem fluids from the resistant cv. Primorskij No sugars, organic acids or phenolic compounds were detected in the xylem fluids, but a number of amino acids were found, and the concentration of some differed in xylem fluids from the two cultivars; on the whole, concentrations were greater in the susceptible cv. Neuland. Synthetic amino acids were supplied to the fungus in vitro and both stimulatory and inhibitory effects (according to the compound and its concentration) were noted upon the germination of conidia and chlamydospores and on mycelial growth and the production of conidia. The role of amino acids and other compounds in the susceptibility of white lupin to wilt is discussed. |
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