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Medientyp:
E-Artikel
Titel:
Secondary Growth in the Axis of Halogeton glomeratus (Bieb.) Meyer (Chenopodiaceae)
Beteiligte:
Baird, W. Vance;
Blackwell, Will H.
Erschienen:
The University of Chicago Press, 1980
Erschienen in:Botanical Gazette
Sprache:
Englisch
ISSN:
0006-8071
Entstehung:
Anmerkungen:
Beschreibung:
<p>We studied developmental processes leading to the structure of the secondary tissues in the axis of Halogeton glomeratus. Secondary vascular tissue is associated with, or embedded in, conjunctive tissue. The secondary tissues of the stem and root exhibit two distinct structural patterns which are products of successive, extrafascicular, bidirectional cambia of varying circumference. This kind of secondary growth is not homologous with the secondary growth typical of most conifers and woody and herbaceous dicotyledons of temperate regions. The secondary vascular tissues of both stem and root show a high degree of evolutionary specialization, based on the criteria of vessel element size, endwall inclination, and pitting. The stem lacks rays, whereas the root has discernible raylike cell aggregates. Terminology and adaptive significance of the type of secondary growth in the Chenopodiaceae and related families are considered.</p>