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Full-Text Articles in Plant Sciences
Vasicentric Tracheids As A Drought Survival Mechanism In The Woody Flora Of Southern California And Similar Regions; Review Of Vasicentric Tracheids, Sherwin Carlquist
Vasicentric Tracheids As A Drought Survival Mechanism In The Woody Flora Of Southern California And Similar Regions; Review Of Vasicentric Tracheids, Sherwin Carlquist
Aliso: A Journal of Systematic and Floristic Botany
Vasicentric tracheids are defined as tracheids present adjacent to vessels in a wood which also possesses libriform fibers or fiber-tracheids as imperforate tracheary elements. Vasculartracheids would correspond with this definition, but are defined as occurring only in latewood, whereas vasicentric tracheids occur throughout a growth ring or in wood of a diffuse-porous species. V asicentric tracheids offer a subsidiary conducting system which can supply stems and leaves when the vessels to which vasicentric tracheids are adjacent fail because of air embolisms. True tracheids (present as the sole imperforate tracheary element type in the woods in which they occur) have much …
Observations On Functional Wood Histology Of Vines And Lianas, Sherwin Carlquist
Observations On Functional Wood Histology Of Vines And Lianas, Sherwin Carlquist
Aliso: A Journal of Systematic and Floristic Botany
Types of xylem histology in vines, rather than types of cambial activity and xylem conformation, form the focus of this survey. Scandent plants are high in conductive capability, but therefore have highly vulnerable hydrosystems; this survey attempts to see what kinds of adaptations exist for safety and in which taxa. A review of scandent dicotyledons reveals that a high proportion possesses vasicentric tracheids (22 families) or true tracheids (24 families); the majority of scandent families falls in these categories. Other features for which listings are given include vascular tracheids, fibriform vessel elements, helical sculpture in vessels, starch-rich parenchyma adjacent to …