Abstract
The sieve-element plastids of 85 species of the Ranunculanae were investigated by transmission electron microscopy. All contained form-Ss plastids. The average diameter of the sieve-element plastids from stem phloem is with 1.62 μm rather large, both compared to other superorders and to the dicotyledon average. Among the five families recognized in the Ranunculales (incl. Papaverales), Lardizabalaceae and Menispermaceae contain the largest average diameters (above 1.9 μm) while those of Berberidaceae, Ranunculaceae, and Papaveraceae are about 1.5 μm. Within the families there is considerable size variation which permits the inclusion of segregate taxa, even if their plastid diameter is much different from the family average (e.g., Hydrastis). Nelumbo nucifera (Nelumbonales) contains form-Ss plastids that are very similar to those of the Ranunculales. — Dispersive P-protein is a common feature found in the sieve elements of all taxa studied. Nondispersive protein bodies are recorded for Clematis and Nelumbo only.
Sieve-element plastids, phloem proteins, and the evolution of the flowering plants, V. — For previous parts in this series see (IV.:) Behnke (1989) and (III.:) Behnke (1988).
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Behnke, HD. (1995). Sieve-element plastids, phloem proteins, and the evolution of the Ranunculanae . In: Jensen, U., Kadereit, J.W. (eds) Systematics and Evolution of the Ranunculiflorae. Plant Systematics and Evolution Supplement 9, vol 9. Springer, Vienna. https://doi.org/10.1007/978-3-7091-6612-3_3
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DOI: https://doi.org/10.1007/978-3-7091-6612-3_3
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