Role of Phytotoxins in Pine Wilt Disease
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چکیده
Characteristic rapid death of pines after infection by Bursaphelenchus xylophilus suggests the involvement of phytotoxins in the pine wilt disease syndrome. Crude extract from diseased pine is toxic to pine seedlings, whereas an extract from healthy pine is not. The response of seedlings to the crude toxin is more prominent in susceptible pine species than in resistant ones. Benzoic acid, catechol, dihydroconiferyl alcohol, 8-hydroxycarvotanacetone (carvone hydrate), and 10-hydroxyverbenone, which are toxic, low molecular weight metabolites, can be isolated from diseased pines. Other unidentified toxins are also found. T h e toxicity of some of these metabolites correlates positively to the susceptibility of pines to B. xylophilus. Some of these abnormal metabolites show synergistic toxicity when in combination. T he D-isomer of 8-hydroxycarvotanacetone, dihydroconiferylalcohol, and I 0-hydroxyverbenone inhibited the reproduction ofB. xylophilus. Cellulase excreted by pinewood nematode also may be involved in rapid wilting.
منابع مشابه
Hyperspectral Analysis of Pine Wilt Disease to Determine an Optimal Detection Index
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