P-type sieve-element plastids present in members of the tribesTriplareae andCoccolobeae (Polygonaceae) renew the links between thePolygonales and theCaryophyllales |
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Authors: | H -Dietmar Behnke |
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Affiliation: | (1) Zellenlehre, Universität Heidelberg, Im Neuenheimer Feld 230, D-69120 Heidelberg, Federal Republic of Germany |
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Abstract: | Form-Pfs sieve-element plastids were found inTriplaris, Ruprechtia, andCoccoloba (Polygonaceae) while other genera of the family and those studied from the often associatedPlumbaginaceae contain S-type sieve-element plastids. The rareness of form-Pfs plastids among the angiosperms, their similarity to the peculiar form-P3fs plastids of theChenopodiineae, and the comparatively small plastid diameters measured for all forms present in theCaryophyllales, Polygonales, andPlumbaginales suggest close relationships between these taxa. The restriction inPolygonaceae of form-Pfs plastids to the closely allied tribesTriplareae andCoccolobeae is discussed with regard to both the intrafamilial and ordinal phylogeny, and also considering possible connections to the only magnoliidaean Pfs-taxonCanella.
Dedicated to Univ.-Prof. DrF. Ehrendorfer on the occasion of his 70th birthday. |
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Keywords: | Caryophyllales Polygonaceae Triplareae Coccolobeae Plumbaginaceae-Sieve-element plastids ultrastructure systematics |
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