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Annals of Botany 78: 671-673, 1996
© 1996 Annals of Botany Company

Occurrence of Form PIIcf Sieve-element Plastids in Xyris Species (Xyridaceae)

S. R. MACHADO and M. G. SAJO+

Departamento de Botânica, IBUNESP, Caixa Postal 520, 18618-000, Botucatu Departamento de Botânica, IBUNESP, Caixa Postal 199, 13506-900, Rio Claro, SP, Brazil

April 10, 1996 ; April 15, 1996

Mature leaf fragments from eight species ofXyris from the Serra do Cipó, State of Minas Gerais, Brazil, were prepared by the usual methods for electron microscopy. Ultrastructural analysis of phloem shows the occurrence of nacreous walls with a polylamellate structure in the sieve-elements ofX. tortilis and plastids similar to P-plastids, form PIIcf in the sieve-elements of all investigated species.

Sieve-element plastids; monocotyledons; Xyris


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