Abstract
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.
Highlights
Chamaecytisus Link is regarded either as a monophyletic genus, morphologically uniform, or it is included into Cytisus Desf. sensu lato, section Tubocytisus DC [1]
Root nodules formed by Ch. podolicus were oblong or manifold-bifurcated at the time of sampling, and they were intensely pink on fresh section
The nodules were composed of apical persistent meristem, vascular system, and several specialized parenchymatous tissues, namely, the nodule cortical layers and the central bacteroidcontaining tissue (Fig. 1a)
Summary
Chamaecytisus Link is regarded either as a monophyletic genus, morphologically uniform, or it is included into Cytisus Desf. sensu lato, section Tubocytisus DC [1]. Chamaecytisus Link is regarded either as a monophyletic genus, morphologically uniform, or it is included into Cytisus Desf. Kláskova is classified as Cytisus podolicus Błocki. The name Ch. podolicus is used by analogy with the genus taxonomy in the checklist of vascular plants of Poland [2]. Chamaecytisus podolicus (Fabaceae) is an endemic species of the Podolian Upland [1], mentioned in the red book of Ukraine as vulnerable [3]. The following brief species description is a compilation from a few sources [1,3,4]: xerophyte, calciclole, nanophanerophyte, stems ascending and hairy, leaves trifoliate with obovate pubescent leaflets, inflorescences (capitulum) terminal, each with 10–12 yellow flowers 25–30 mm long, primary bloom in June–July followed with a secondary one, calyx densely pubescent, standard 23–25 mm long, pods 25–30 mm long ripe in July–August
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