جستجوی مقالات مرتبط با کلیدواژه « کلنیزاسیون » در نشریات گروه « جنگلداری »

The symbiosis of mycorrhizal fungi with plant roots is one of the most important symbiotic relationships in soil. In this study, biodiversity and symbiosis of arbuscular mycorrhizal fungi (AMF) with Amygdalus arabica Olivier, A. lycioides Spach, A. elaeagnifolia Spach and A. orientalis Mill. were investigated in three sites in Ilam province. After extracting soil samples from a depth of 0-30 cm, spores of mycorrhizal fungi were separated by the wet sieving method and the fungi were identified based on the morphological characteristics of the spores. The results revealed 34 different species of AMF belonging to 10 different genera. The highest biodiversity of fungi (28 species) was observed in A. arabica. In addition, 19 AMF species in A. elaeagnifolia, 25 in A. orientalis and 26 in A. Lycioides were identified. Moreover, the lomus with 49% and G. nanolumen with 21% were of the highest relative frequency of AMF genus and species among all the tree species, respectively. Significant differences were observed between Amygdalus species in terms of spore density, species richness and Shannon–Wiener diversity index of AMF. So that most of the three indices were observed in A. arabica. Also, spore density showed a negative correlation with soil sand percentage and phosphorus amount, as well as a positive correlation with soil clay percentage.

Mycorrhizal fungi, as a part of soil organisms, are mutualism for plant species that lead to an increase in soil fertility by enzymes secretion itself and stimulating the secretion of plant enzymes. The present study was carried out to investigate the potential and identification of arbuscular mycorrhiza fungi associated with Cerasus mahaleb and enzymes activity of acid and alkaline phosphatase, urease and dehydrogenase. For this purpose, roots of five trees of Cerasus mahaleb and their rhizosphere were sampled in ChaharTagh-e-Ardal habitat located in ChaharMahal va Bakhtiari Province. Arbuscular mycorrhizal fungi were isolated by wet sieve and identified using morphological characteristics. After soil extraction and carrying out biochemical reactions, soil enzymes activities were measured by spectrophotometer. In this study, six species of arbuscular fungus from four genera of Funneliformis, Claroideoglomus, Rhizophagus and Septoglomus were introduced as associated species with mahaleb, three species belonging to the genus Rhizophagus. The percentage of root colonization was 70.25% in spring and 76% in autumn. Also, the activities of acid phosphatase, dehydrogenase and urease indicated significant differences among seasons. The results showed that there is a significant positive correlation between percentage of root colonization and enzymes activities that shows influence of mycorrhizal fungi on enzymes activities in spring season. Due to the high percentage of mycorrhizal colonization in Cerasus mahaleb, dependence of this species on mycorrhizal symbiosis is essential and should be considered seriously in planting and rehabilitation programs.

Mycorrhizal fungi are essential components of sustainable soil–plant systems and have a main role in sustainable forestry. The present study was carried out to investigate the evaluating status of mycorrhizal symbiosis, activities of acid and alkaline phosphatase and some nutrients (phosphorus, nitrogen and potassium) in rhizosphere of Lonicera nummulariifolia located in Chahartagh Ardal habitat in Chaharmahal va Bakhtiari Province. For this purpose, roots of five trees of L. nummulariifoli and soils around them were sampled in spring and autumn. The results showed that Lonicera is an incredible symbiosis since the percentage of colonization was 90.2 and 80.6 in spring and autumn, respectively. The activity of acid and alkaline phosphatase also was 240.59 and 392.85 in spring and 146.48 and 295 (ρNP) in autumn, respectively. All measured elements had higher values in spring than autumn. Correlation was significant between soil phosphatases with total nitrogen and organic matter in spring and alkaline phosphatase with total nitrogen in autumn. High level of AMF colonization and acid phosphatase activity in spring may be due to good conditions of soil and growing of root hairs are in the early growing season. With regard to the microbial origin of alkaline phosphatase, increasing this enzyme in spring illustrated increasing the quality and quantity of microorganisms and mineralization of organic matter and rising nutrients. In general, impressive percentage of mycorrhizal colonization in L. nummulariifolia indicates dependency of this species to mycorrhizal symbiosis. Therefore, the role of these fungi in planting with this species, especially in destruction habitats, is vital.