THE INCIDENCE OF DORMANCY IN TWO-NODE STEM AND RHIZOME FRAGMENTS OF POLYGONUM AMPHIBIUM L.

Summary. Monthly samples of field-grown rhizomes and aerial stems of Polygonum amphibium were tested for innate dormancy during parts of 2 years in England and during 5 months of a third year in southern Germany. All stems and rhizomes were cut into two-node fragments, planted in soil in a warm glasshouse, and the new shoots counted after 3 weeks. Dormancy per month for different categories of stems varied from 0 to 23%, averaging 4–3% for all fragments tested but only 1–3% for mature buds. No evidence of a dormant period was found in either country.
Incidence de la darmance dans une tige à deux noeuds et des fragments de rhizome de Polygonum amphibium L.