Restriction of Infection Threads in Nodulation of Clover and Lucerne

Abstract

Clover and lucerne roots from plants grown in tube culture were examined for infection thread formation and nodule number. The number of infection threads was about equal to the number of nodules in Trifolium pratense L.; this relation was shown to hold for abundantly and sparsely nodulating plants and for bacterial inocula.nts producing large and small numbers of nodules.