جستجوی مقالات مرتبط با کلیدواژه « قارچ اندوفیت » در نشریات گروه « اکولوژی »

Abiotic-stress tolerance and plant growth enhancement can be evoked in crops by the exploitation of beneficial microorganisms and optimal provision of plant nutrients. The effect of inoculation with Serendipita indica and foliar application of potassium on growth and morphophysiological characteristics of Dracocephalum kotschyi plant under drought stress was the goal of the present experiment. The study was conducted in a completely randomized design with two levels of fungus inoculation (non-inoculated and inoculated with S. indica), three levels of potassium application (0, 1 and 3% K) and two levels of drought stress (Field capacity (F.C.) and 50% F.C.) with three replications. The results showed that drought stress decreases the biomass, relative water content, chlorophyll and potassium. While inoculation with S. indica and potassium application increased traits such as shoot and root biomass, relative water content, chlorophyll, potassium and antioxidant enzymes and consequently reduced the harmful effects of drought stress. Drought stress caused membrane instability by increasing electrolyte leakage and malondialdehyde, while inoculation with fungus and potassium treatment reduced lipid peroxidation and electrolyte leakage. Due to the importance of D. kotschyi and the effect of biomass increase on the amount of its medicinal substance, inoculating with S. indica and foliar application of potassium can be a suitable method to enhance the growth and drought stress tolerance of D. kotschyi.

The pear is one of the most important fruit trees in temperate regions and is salt-sensitive trees. Studies have shown that the use of Piriformospora indica as an endophytic fungus reduces the adverse effects of salinity stress on plants and improves morphophysiological traits.

In the present study, the experiment was performed as a factorial completely randomized design with 5 replications on the pyrus rootstock CV Pyrodvarf in pot culture experiment. The first factor includes two levels of P. indica fungus (inoculation and non-inoculation) and the second factor is four salinity levels of soil (1.7, 3, 4.5 and 6 dS.m-1) using sodium chloride. After inoculation with the fungus, the salinity levels were applied to the plants.

The results showed that the interaction effect of salinity × fungi on morphophysiological characteristics, total chlorophyll content (P <0.05), branch diameter growth, electrolyte leakage, proline, soluble sugars, peroxidase and polyphenol oxidase enzymes and root colonization percentage (P <0.01) were significant. At the highest salinity levels (6 dS/m), fungal inoculation caused an increase in surface-to-root dry weight ratio (38.81%), branch diameter growth (31.14%), total chlorophyll (27.72%), peroxidase (100%), polyphenol oxidase (62.5%) and root colonization percentage (100%) and decrease in electrolyte leakage rate (19.34%), proline (10.34%) and soluble sugars (8.77%) ) compared to non-inoculated control plants.

In general, the results of this study showed that the coexistence of P. indica can modulate the destructive effects of salinity on this pear cultivar.