TITLE

PRESENCE OF TORUS-BEARING PIT MEMBRANES IN REPRODUCTIVE ORGANS OF OSMANTHUS AMERICANU (OLEACEAE)

AUTHOR(S)
Dute, Roland; Hansen, Curtis J.; Baker, Mary; Lambert, Erin; Michael, Whitni
PUB. DATE
January 2013
SOURCE
Journal of the Alabama Academy of Science;Jan2013, Vol. 84 Issue 1, p17
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The present manuscript is a continuation of previous investigations regarding the distribution of torus-bearing tracheary elements within organs of Osmanthus. In this instance, flowers and fruits are the objects of study using light and scanning electron microscopy. The xylem of anthesis flower parts and pedicels consists exclusively of tracheary elements with helical bands, and rarely, with annular bands. Only later in the ontogeny of fruit walls and fruit stalks do pitted tracheary elements occur. It is these latter xylary cells that possess pit membranes with tori. Structure and chemistry of the torus are identical to that found in other organs of the plant. Tracheary elements containing pits with torus-bearing pit membranes also possess helical sculpturing (not helical banding). Tori are thought to isolate air embolisms in the xylem, increasing drought tolerance, and help to maintain water flow in mature plant organs.
ACCESSION #
91596101

 

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