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Annals of Botany 72: 423-431, 1993
© 1993 Annals of Botany Company

Structure of the Needles in the Early Phases of Development in Pinus ponderosa P. et C. Lawson with Special Reference to Plastids

Jan Dvorák and Jitka Stokrová

Institute of Botany, Academy of Sciences of the Czech Republic, 252 43 Pruhonice near Prague, and Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 166 37, Prague 6, Czech Republic

Before they emerged from the fascicular sheath, the tissues of young needles of Pinus ponderosa P. et C. Lawson already showed some characteristics typical of mature needles. The organelles, particularly the plastids, had undergone different development. The plastids in different types of cell varied in their ultrastructure and in association with the endoplasmic reticulum (ER). A sheath of ER was observed around the amoeboid plastids in epidermal cells, epithelial cells of resin ducts and maturing transfusion tracheids whereas there was no ER sheath around the young mesophyll chloroplasts, the fusiform chloroplasts in some transfusion tracheids and the proplastids in xylem and phloem cells. The content of chlorophyll (a+b) was 0·85 g kg-1 dry matter and chlorophyll a/b ratio was 2·70. The needles may become photosynthetically active whilst still within the fascicular sheaths.Copyright 1993, 1999 Academic Press

Pinus ponderosa, ponderosa pine, needle structure, needle ontogeny, plastids, endoplasmic reticulum


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