Phloem transport in trees.

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Slower phloem transport in gymnosperm trees can be attributed to higher sieve element resistance.
In trees, carbohydrates produced in photosynthesizing leaves are transported to roots and other sink organs over distances of up to 100 m inside a specialized transport tissue, the phloem. Angiosperm and gymnosperm trees have a fundamentally differen

Phloem transport and drought.
Drought challenges plant water uptake and the vascular system. In the xylem it causes embolism that impairs water transport from the soil to the leaves and, if uncontrolled, may even lead to plant mortality via hydraulic failure. What happens in the

Proton co-transport of sugars in phloem loading.
Loading of (14)C-labelled sugars from the hollow petiole of Ricinus communis L. was stimulated by potassium and by low pH in that both the (14)C-activity and the sugar concentration of phloem sap collected from a nearby incision increased. A pH drop

Leaf development and phloem transport in Cucurbita pepo: Carbon economy.
Net photosynthesis, dark respiration and growth for leaf 5 of Cucurbita pepo L. plants grown under controlled conditions were measured and the data used for an assessment of the changes in carbon balance during growth of the leaf through expansion to

On the volume-flow mechanism of phloem transport.
A steady-state model of solution flow in a tubular semipermeable membrane is developed for an arbitrary distribution of solute sources and sinks along the translocation path. It is demonstrated that the volume-flow mechanism of phloem transport depen

The proportion of sieve elements in the phloem of some tropical trees.
Measurements have been made of the proportion of the area of sieve elements in the cross-sectional area of the secondary phloem of trees of two tropical genera in which the presence of storied sieve plates makes the recognition of sieve elements part

Leaf development and phloem transport in Cucurbita pepo: Maturation of the minor veins.
Young leaves of Cucurbita pepo L. were examined by whole-leaf autoradiography and serial paradermal sections were examined by light microscopy to determine whether commencement of sugar export depends upon the minor vein phloem achieving structural m

Leaf structure in relation to solute transport and phloem loading in Zea mays L.
Small and intermediate (longitudinal) vascular bundles of the Zea mays leaf are surrounded by chlorenchymatous bundle sheaths and consist of one or two vessels, variable numbers of vascular parenchyma cells, and two or more sieve tubes some of which

Allocation, stress tolerance and carbon transport in plants: how does phloem physiology affect plant ecology?
Despite the crucial role of carbon transport in whole plant physiology and its impact on plant-environment interactions and ecosystem function, relatively little research has tried to examine how phloem physiology impacts plant ecology. In this revie

Scaling of phloem structure and optimality of photoassimilate transport in conifer needles.
The phloem vascular system facilitates transport of energy-rich sugar and signalling molecules in plants, thus permitting long-range communication within the organism and growth of non-photosynthesizing organs such as roots and fruits. The flow is dr