2.2. Isolation, purification and conservation of mycorrhizal fungi
Mycorrhizal fungi were isolated using an improved process as used by Nontachaiyapoom et al. (2010). Briefly, hand sections of roots (Fig. 1c) were observed for the presence of pelotons with a light microscope. Then colonized roots were surface-sterilized in 70% (v/v) ethanol for 40 s, 2.5% (v/v) NaClO 2 min and rinsed three times in sterile distilled water. Ten sections per root, obtained with a sterile blade, were placed on the potato dextrose agar (PDA) containing 50 μg/ml streptomycin, and 100 μg/ml tetracycline. Samples were incubated in the darkness at 25 °C, and observed daily for 30 days under stereomicroscope. Hyphal tips of fungi were transferred to fresh PDA for purification. All isolates growing on the PDA for one week were inoculated into distilled 10% glycerol and placed in ambient temperature for 4 days and then deposited in the ultra cold storage freezer (−80 °C) of Laboratory of Mycology, Biotechnology Center, Institute of Medicinal Plant Development (IMPLAD), and Chinese Academy of Medical Sciences (CAMS).
2.2. Isolation, purification and conservation of mycorrhizal fungiMycorrhizal fungi were isolated using an improved process as used by Nontachaiyapoom et al. (2010). Briefly, hand sections of roots (Fig. 1c) were observed for the presence of pelotons with a light microscope. Then colonized roots were surface-sterilized in 70% (v/v) ethanol for 40 s, 2.5% (v/v) NaClO 2 min and rinsed three times in sterile distilled water. Ten sections per root, obtained with a sterile blade, were placed on the potato dextrose agar (PDA) containing 50 μg/ml streptomycin, and 100 μg/ml tetracycline. Samples were incubated in the darkness at 25 °C, and observed daily for 30 days under stereomicroscope. Hyphal tips of fungi were transferred to fresh PDA for purification. All isolates growing on the PDA for one week were inoculated into distilled 10% glycerol and placed in ambient temperature for 4 days and then deposited in the ultra cold storage freezer (−80 °C) of Laboratory of Mycology, Biotechnology Center, Institute of Medicinal Plant Development (IMPLAD), and Chinese Academy of Medical Sciences (CAMS).
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