Volume 8, Issue 1 (12-2009)
Abstract
This investigation was carried out to identify type and extent of mycorrhizal distribution in Tandooreh National Park and determine the effects of Ca and K concentration on mycorrhizal development in vitro on Zea maiz using natural soil as substrate. Soil and root samples were taken from top 30 cm soil using a 10cm diam. steel borer from 7 stations located at 11 50 to 2300m heights from sea level. At least 2 plots of 100m2 (10 ´10m) were sampled. Plant samples were also collected. Sections were prepared from root samples were longitudinally sectioned and stained with Lacto phenol cotton blue. Spores of mycorhizae were isolated usingcentrifugation60% in sucrose solution centrifugation at 9000 rpm for 2 min. Surface characteristics of spores were used in their identification. 53 species of plants were identified. Majority of plants (50] species had vesicular aruscular mycorrhizae (greater than 90%). Seven species of Glmous were present in the rhizosphrere of all stations. Seedlings of maiz were grown in the pots containing Tandooreh soil with or without addition of given amounts of Ca and K in a factorial statistical plan. After 8 weeks of cultivation in greenhouse conditions, the plants were removed and their roots were separated and stained using method of Hyman and Philips to detect type and extent of mycorrhization. Dry weight and nutritional elements were determined in roots and shoots. K and Ca added in certain concentrations to soil were effective on mycorrhizal development. Ca and K had synergistic ionic effects in lower concentrations and showed antagonistic ionic effects in high concentrations in mycorrhizal development. There was also a correlation between mycorrhizal development and absorbed amount of Ca and K in shoots.
Volume 9, Issue 4 (10-2010)
Abstract
Many investigations have been carried out to produce ectomycorrhizas on the growth and nutrent absorption of plants. However, no investigations has been carried out on the effect of ectomycorrhizas on nutrient contents of pistachio Badamy, when mycorrhzal (M) and Non-mycorrhizal (NM) plants exposed to different amounts of Mg. To study the resistance role of ectomycorrhizal Pistachio plants exposed to excess Mg, mycorrhizal (M) and Non-mycorrhizal (NM) plants of pistachio var Badami were grown at axenic condition and were treated with different levels of Mg (MgSo4) prepared as a Hogland nutrient solution with 1/2 concentration. The colonization rates of the plants with Agaricus bisporus and mineral nutrient contents in roots and shoots were measured and statistically compared. The results showed the increasing of mycorrhizal colonization as Mg increased in the medium. Mycorrhizal plants had higher Mg, Ca, P, k, Fe, Na, Mn, Zn, Cu contents at high levels of Mg treatment. At low amounts of Mg, K, Fe, Mn, Cu contents of NM plants were higher than M plants.
