Effect of mycorrhyzal inoculation on tolerance of Castanea sativa Mill plants to Phytophthora cinnamomi infection
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abstract
This work was supported by the project ECOPLUGMIC
Two different trials (1) and (2) were made in order to test mycorrhizal inoculation effect against Phytophthora cinnamomi in vivo. Castanea sativa Mill seedlings were inoculated with Pisolithus tinctorius at sowing (M1). Two month later, half of the M1 plants were reinoculated (M2) with P. tinctorius. 1) at the same time, M1, M2 and nonmycorrhizal (NM) plants were inoculated with 0.1%, 0.5% and 2% of P. cinnamomi; 2) One month after reinoculation, M2 and nonmycorrhizal (NM) plants were inoculated with 0.1% and 0.5% P. cinnamomi.
The results obtained for the two trials were very different in terms of mycorrhizal protection against P. cinnamomi. Trial 1) shows that mycorrhizal inoculation simultaneous to reinoculation could not induce protection against P. cinnamomi. Results of trial 2) showed mycorrhizal protection against P. cinnamomi for both percentages of inoculation.
From the results obtained we can consider that mycorrhizal protection against P. cinnamomi depends on the time of mycorrhizal association. Trial 2) shows that 3 month after mycorrhizal fungus inoculation and 1 month after reinoculation plants present some degree of protection against P. cinnamomi, suggesting that after an adequate period, mycorrhization induces plant protection against this pathogenic fungus.
