What Is Phloem Unloading?
نویسندگان
چکیده
منابع مشابه
What 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 unloading in Arabidopsis roots is convective and regulated by the phloem-pole pericycle
In plants, a complex mixture of solutes and macromolecules is transported by the phloem. Here, we examined how solutes and macromolecules are separated when they exit the phloem during the unloading process. We used a combination of approaches (non-invasive imaging, 3D-electron microscopy, and mathematical modelling) to show that phloem unloading of solutes in Arabidopsis roots occurs through p...
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متن کاملEvidence for apoplasmic phloem unloading in developing apple fruit.
The phloem unloading pathway remains unclear in fleshy fruits accumulating a high level of soluble sugars. A structural investigation in apple fruit (Malus domestica Borkh. cv Golden Delicious) showed that the sieve element-companion cell complex of the sepal bundles feeding the fruit flesh is symplasmically isolated over fruit development. 14C-autoradiography indicated that the phloem of the s...
متن کاملPathway of Phloem unloading of sucrose in corn roots.
The pathway of phloem unloading and the metabolism of translocated sucrose were determined in corn (Zea mays) seedling roots. Several lines of evidence show that exogenous sucrose, unlike translocated sucrose, is hydrolyzed in the apoplast prior to uptake into the root cortical cells. These include (a) presence of cell wall invertase activity which represents 20% of the total tissue activity; (...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1990
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.94.2.393