جستجوی مقالات مرتبط با کلیدواژه « ترکیبات فنلی » در نشریات گروه « آب و خاک »

In order to investigate the effects of salicylic acid and calcium on resistance chilling of pistachio seedlings, cv. Kale-Quchi, a factorial greenhouse experiment was carried out in a completely randomized design with three replications. Treatments consisted ofwere salicylic acid (0, 0.75 and 1.5 mM), calcium (0, 3 and 6 per thousand) and temperature (0, -2 and -4 °C). The results showed that, leaf electrolyte leakage percentage increased with decreasing temperature to -4 °C, but combined application of salicylic acid (1.5 mM) and calcium (6 per thousand) decreased this important indicator of chilling by 47 percent compared to control in this temperature. Also, with decreasing temperature (from 0 to -4 °C), the phenolic compounds, and soluble sugars and proline concentration incresed 44 and, 31 and 100 percent respectively and proline concentration more than two folds increaded compared to control seedlings. Also, the results of this experiment showed that the chlorophyll fluorescence index, total chlorophyll, carotenoids, soluble proteins and starch content decreased with decreasing temperature, but with combined application of 1.5 mM salicylic acid and treatment ofcalcium (6 per thousand) calcium, the amount of these parameters increased these parameters compared to control. So that the content of total chlorophyll, carotenoids, protein and starch increased compared to control at 4 °C by 87, 49, 25 and 99 percent, respectively compared to control and protected pistachio seedlings against chilling. Based on the results of this study, in chilling conditions, the combined application of salicylic acid and calcium, by improving the photosynthetic parameters and increasing osmotic regulators, decreased detrimental effects of chilling of pistachio seedlings. in chilling conditions.

One of the properties of systemically acquired resistance in plants is their concomitance with the biochemical changes including enhancement of activities of defense-related enzymes. The leaf extract of Reynoutria sachalinensis (F. Schmidt) Nakai is known to be an effective compound for the control of a few plant diseases particularly powdery mildew of cucurbits (caused by fungal pathogen Podosphaera fusca), by inducing host defense responses. In the present investigation, the effects of this extract on some defense responses of cucumber plants were studied via in vivo tests. Changes of defense responses in the extract treated-cucumber plants, with or without pathogen inoculation, were studied and compared with those of non-treated control plants. Results indicated that specific activity of peroxidase increased significantly in treated tissues. Enhancement of enzyme activity showed the same patterns in both the pathogen inoculated- and non-inoculated-plants thus the pathogen attack did not affect the enzyme activity. Specific activity of phenylalanine ammonia-lyase in the non-inoculated extract treated-plants showed a transient fast increase during 24 hours after the treatment, whereas in the inoculated ones, it showed a permanent slow increase probably due to the interaction between extract treatment and pathogen attack. Phenolic content of extract treated-plant tissues, despite small fluctuations, did not show any definite pattern of changes.