منابع مشابه
Phloem transport in trees.
Phloem is like an enigmatic central banker: we know how important phloem is to plant function, but very little about how phloem functions as part of a whole-plant economy. Phloem transports carbohydrates, produced by photosynthesis and hydrolysis of reserve compounds, to sink tissues for growth, respiration and storage. At photosynthetic tissues, carbohydrates are loaded into phloem (Rennie and...
متن کاملWhat is Phloem unloading?
Several studies of phloem unloading have failed to distinguish between transport events occurring at the sieve element/companion cell boundary and subsequent short-distance transport through parenchyma cells. Indirect evidence has been obtained for symplastic unloading in storage and utilization sinks. In other sinks transfer to the apoplast may occur, but not necessarily at the sieve element/c...
متن کاملPhloem Structure and Function
The development of vascular tissueswas prerequisite to the evolution of land plants, allowing for the division of labour between different organs. Instead of the entire plant body, the roots alone became specialized for the uptake of water and nutrients. The aerial organs diversified into stems, leaves andflowers. Photosynthesis shifted increasingly into leaves, expanding the light-exposed area...
متن کاملPhloem loading in squash.
Squash (Cucurbita pepo L. var. melopepo torticalis, Bailey) leaves were supplied with (14)C-sucrose, then specific radioactivities of the glucose and galactose moieties of translocated stachyose were determined. In every case, the specific radioactivity of the galactose moiety was greater than that of the glucose moiety. It is concluded that the stachyose was not synthesized at either the phloe...
متن کاملPhloem mobility of magnesium.
Magnesium-28 was applied to specific leaves of bean (Phaseolus vulgaris) and barley (Hordeum vulgare) plants. After 24 hours, as much as 7% of the absorbed Mg was exported from the treated bean leaves and 11% was transported basipetally from the treated zone of the barley leaves. Transport of Mg did not occur past a heat-killed section of the treated leaf, thereby indicating that translocation ...
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ژورنال
عنوان ژورنال: Botanical Gazette
سال: 1916
ISSN: 0006-8071
DOI: 10.1086/331821