Alaska:

Abstract

Sachiyo Koizumi and Hiromasa KQyama : Emergence pattern of root sprouts from horizontal roots in Black locust(Robinia pseudoaeacie L.)at river basin. Tohoku J. For . Sci.17(2>:31 −35,2012. Black locust can produce two types of new sprouts from horizontal roots . One is the sprouts for vegetative reproduction which occur from apical meristem every year, and the other is iniury−induced sprout that emerges after the stem or root system is damaged by natural disturbance or logging. Among 124 sprouts investigated at bank of Akagawa river ,74 (59.7%) belonged to the former type and 50 (40,3%) the latter, Further , all the injury−induced sprouts emerged from dormant buds accumulated on the surface of root and no sprout derived from adventitious bud. Since most of the horizontal roots were less than four−years−old at the age when they emerged sprouts , the dormant buds seem to have rather short lifespan, even though they distribute at high density on root surface 、 No sprQut emerged on the