Pannee Dhitaphichit and Janthimaphorn Nawawongwiwat

pp. 285 - 292

Abstract

The aim of this research was to determine the types of mating system of five edible mushrooms in the genus Lentinus, i.e. Lentinus squarrosulus, L. polychrous, L. strigosus, L. giganteus and L. sajor-caju
including the well-known edible, medicinal and industrialized species, Lentinula edodes. Lentinus and Lentinula are closely related species. The experiments were carried out by crossing each pair of 12 single spore isolates (SSIs, monokaryons) from one single fruiting body of each species in all combinations by placing each pair of the inocula, about 2 cm apart, on a PDA plate at 30°C for 1 week for all species of Lentinus, or on a MEA plate at 25°C for 2-3 weeks for Lentinula edodes, followed by examination of clamp connections on the hyphae at the contact zone. The presence or absence of clamps indicates compatible or
incompatible mating, respectively. The ratios of the number of compatible matings to the number of total matings of all the species were determined to be 1:4. This ratio indicated that the sexuality of all the six species is bifactorial (tetrapolar) heterothallism. These results indicated to some extent that species belonged to the same or related genus tend to have the same mating type. This is the first report about mating system of Lentinus species except that of Lentinula edodes. The results of the 12 SSIs were also separated into four groups according to their four mating types (i.e. A₁B₁, A₁B₂, A₂B₁ and A₂B₂).