Host: The Japanese Forestry Society
Quercus serrata (Qs), Q. myrsinaefolia (Qm), and Cryptomeria japonica (Cj) were compared in respect of tropic response to clarify physiological factor determining stem inclination on slope. Main stem angle to the zenith of mature trees on slope was Qs > Qm > Cj. For artificially inclined seedlings, all the species showed gravitropic erection of apex in non-shaded treatment. In treatment with light restricted to one lateral direction, Qs grew toward the light, Cj erected to the vertical in contrast, and Qm was intermediate between the both. As intensity of phototropic response that was shown by main stem of seedlings was also Qs > Qm > Cj, it is suggested that difference of the intensity affects interspecific difference of stem inclination on slope.
