Induction of peroxidase as a disease resistance response in resistant (Hibiscus trionum) and susceptible (Althea armeniaca) species in the family Malvaceae
2007
Golubenko, Z. | Akhunov, A. | Khashimova, N. | Beresneva, Y. | Mustakimova, E. | Ibragimov, F. | Abdurashidova, N. | Stipanovic, R.
The pathogen-induced biosynthesis of peroxidase (PO) in resistant and susceptible wild species of Malvaceae was studied. Specifically, Hibiscus trionium was found to be resistant to the wilt pathogen Verticillitun dahliae, and Althea armeniaca was susceptible. After inoculation with V dahliae, PO activity increased more rapidly in the resistant plant: increased activity in H. trionum was noted within I h after inoculation, remained high for 5 h, and decreased after 18 h. After 5 days, the levels did not differ from the control. In the susceptible A. armeniaca. PO activity did not differ statistically from the control even after 18 h, but was significantly higher after 5 days. Electrophoretic analysis of inoculated tissue extracts showed the occurrence of two new isoforms in H. trionum after inoculation: new isoforms did not occur in A. armeniaca. A chitin affinity chromatography column showed the presence of a chitin-binding peroxidase isozyme in healthy H. trionuln that increased dramatically after inoculation. Two chitin-binding peroxidase isozymes were observed in healthy A. al-Inelliaca: one (R-f 0.26) did not increase and the other (R-f 0.89) evinced only a small increase after inoculation.
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