The protocols of DNA extraction, purification and ethanol
precipitation were done as described in Zolan and Pukkila (1986).
Briefly, single-spore cultures were placed on potato carrot agar
(PCA) medium at 30°C for 7 days. The mycelium and conidia were
transferred into a mortar and pestle and ground with liquid nitrogen
at room temperature, and transferred into a 1.5 ml Eppendorf tube
containing 600 μL extraction buffer [1% hexadecyltrimethylammonium
bromide, 0.7 M NaCl, 50 mM Tris-HCl (pH 8.0), 10 mM
EDTA, 1% 2- mercaptoethanol], vortexed and incubated at 60°C for
30 min.
An equal volume of chloroform-isoamylalcohol (24:1, v/v) was
added, tubes were then centrifuged 5 min at maximum speed. The
aqueous phases were recovered into a fresh tubes containing
isopropanol and another centrifugation was done for 1 min. The
final DNA pellets were obtained by dissolving in 300 μL of TE buffer
[10 mM Tris-HCl (pH 8.0), 1 mM EDTA].