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PHLOEM OF PRIMITIVE ANGIOSPERMS. I. SIEVE‐ELEMENT ONTOGENY IN THE PETIOLE OF LIRIODENDRON TULIPIFERA L. (MAGNOLIACEAE)
Author(s) -
Dute R. R.
Publication year - 1983
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1983.tb12433.x
Subject(s) - biology , sieve tube element , botany , plasmodesma , phloem , apoplast , magnoliaceae , cell wall , biophysics
As part of a continuing study of sieve elements in primitive angiosperms, a study of this cell type was undertaken in Liriodendron tulipifera. A typical ontogenetic sequence was observed in which synthetic processes such as wall thickening are followed in time by cellular lysis of nucleus, ribosomes, microtubules, vacuoles, and dictyosomes. This lysis is selective in that certain cellular components (e.g., the plasmalemma) remain unaffected. Concomitant with lysis is the formation of sieve‐area pores from plasmodesmata. Comparison of pore size on end and lateral walls indicates that the use of the term “sieve tube” rather than “sieve cell” to describe these elements is appropriate.