| Autor: |
Sun, Jia Man, Fu, Jun Fan, Zhou, Ru Jun, Su, Wei Na, Yan, Xue Rui |
| Zdroj: |
Advanced Materials Research; December 2012, Vol. 610 Issue: 1 p3511-3517, 7p |
| Abstrakt: |
Cylindrocarpon root rot, caused by Cylindrocarpon destructans, is a severe disease on ginseng (Panax ginseng C.A. Meyer) in northeast China. Methyl jasmonate (MeJA) has been studied for its ability to induce plant defenses against pathogens. The effects of MeJA on the colony diameter of C. destructans and seedling growth were examined in vitro. Two-year-old ginseng roots were drenched with MeJA (200 mg/L) and then inoculated with conidia suspension of C. destructans (1×106 conidia/ml). Disease severity was assessed on inoculated roots, and the activation of defense responses was also measured. Results showed that MeJA had no effect on the growth of C. destructans and seedlings at low concentrations. The incidence rate and disease severity on MeJA-treated ginseng roots was significantly reduced compared with untreated roots. The proline content was increased but the malondialdehyde (MDA) content decreased in MeJA- treated roots. The activities of phenylalanine amino-lyase (PAL), catalase (CAT), peroxidase (POD) and polyphenoloxidase (PPO) were significantly enhanced in treated roots. It was concluded that low concentrations of MeJA had no effect on C. destructans, but it stimulated the activities of defense enzymes in treated ginseng roots and alleviated the damage of roots from C. destructans. Therefore, the control of Cylindrocarpon root rot by MeJA may involve the activation of the disease-related defense system. |
| Databáze: |
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