Physiological responses of tomato plants grown in Fusarium suppressive soil
1993
Tamietti, G. (Universita degli Studi, Torino (Italy). Dipt. di Valorizzazione e Protezione delle Risorse Agroforestali) | Farraris, L. | Matta, A. | Gentile, I.A.
Tomato plants grown in a Fusarium wilt suppressive soil and in the same soil steamed and amended with non-pathogenic Fusarium strains were protected from subsequent infection with Fusarium oxysporum f. sp. lycopersici. Protected plants had higher laminarinase, chitinase, N-acetyl-glucosaminidase and beta-1,4-glucosidase activity than unprotected plants grown in steamed unamended soil. Higher peroxidase and polyphenoloxidase activity and higher content of phenols were also associated with suppressive soil conditions, although in a less consistent way. Among 5 non-pathogenic Fusarium strains, strain 5a1 was the most suppressive and enhanced enzyme activity more than did the other strains, whereas strain T was inactive and did not induce changes in activity. These results are in accordance with previous work showing that induced resistance is associated with enhanced activity of glycosidases and phenol oxidizing enzymes, and increased phenols content. It is suggested that induced resistance is part of the mechanism of the natural suppressiveness of soil and that this resistance is induced by non-pathogenic Fusarium strains
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