Root nodule structure in Chamaecytisus podolicus

By means of microscopic analyses, it was shown that root nodules formed by <em>Chamaecytisus podolicus</em> exhibited all structural features typical for indeterminate nodules of temperate genistean shrubs: (<em><strong>i</strong></em>) apical nodule meristem composed of infected and non-infected domains, (<em><strong>ii</strong></em>) parenchymatous bacteroid-containing tissue with infected cells only resulting from mitotic activity of infected meristematic cells, (<em><strong>iii</strong></em>) absence of infection threads, and (<em><strong>iv</strong></em>) convoluted bacteroids singly enclosed in a symbiosome membrane. For the first time, it was shown that the nodule meristem is organized into longitudinal files of sister cells.