Abstract:

Effects of ectomycorrhizas on pine seedlings in the resistance against pine shoot blight and canker and pine wilt disease were studied in this paper, the results showed that ectomycorrhizas improved the resistance of Pinus massoniana against pine shoot blight and canker. The mycorrhizal seedlings inoculated Boletus edulis have the best resistance, followed the mycorrhizal seedlings inoculated Amanita pantherina and Pisolithus tinctorius 2, the resistance of mycorrhizal seedlings inoculated P. tinctorius 1 and Lacearia aemthystea was weaker; but ectomycorrhizas didn't evidently improve the resistance of P. elliottii against pine shoot blight and canker. After inoculating Bursaphelenchus xylophilus to mycorrhizal seedlings of P. massoniana and P. thunbergii, it was found that ectomycorrhizas improved the resistance of them against pine wilt disease, retarded or lightened the death of pine seedlings, which inoculating B. edulis, P. tinctorius 2 and A. pantherina had better effects. There are some differences in the activities of PAL among the mycorrhizal seedlings of P. thunbergii inoculated with B. xylophilus. The result suggested that promoting effect of ectomycorrhizas on pine seedling and the activities of PAL in the mycorrhizal seedling have some relation to its resistance.

Key words: ectomycorrhiza, pine seedlings, disease resistance, Sphaeropsis sapinea, Bursaphelenchus xylophilus, PAL