The below mentioned article provides an useful note on the phloem loading and unloading in plants. Best practice guidelines for safe unloading of road freight. Society of operations engineers soe free download at code of. Shipshore checklist for loading and unloading dry bulk cargo carriers. Explanation of transport of sugar via the phloem in plants.
Pdf phloem unloading strategies and mechanisms in crop. Phloem loading is the process of loading carbon into the phloem for transport to different sinks in a plant. Phloem loading result in lowered water potential compared with adjacent xylem cells causing water to move from xylem to phloem by osmosis this influx of water creates a high turgor pressure near the source and lower turgor pressure near sink 7. Apart from the xylem and phloem loading and unloading systems also the distribution of p i within cells is.
Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. Although the primary unloading event from the sieve elements to the phloem pole. Phloem loading and unloading free download as word doc. Phloem loading and unloading of cowpea mosaic virus in vigna unguiculata. Translocation of organic solutes such as sucrose i. Loading systems delivers total solutions for loading and unloading with the emphasis on. Abstractthe phloem is often regarded as a relatively straightforward transport system composed of. Translocation occurs in phloem bidirectional composition mechanism of translocation munch pressure flow hypothesis phloem loading and unloading sourcesink relationships.
Structural and functional heterogeneity in phloem loading. The transport events from the sieve elements to the sites of utilization within the recipient sink cells contribute to phloem unloading. Blucode code of practice of the safe loading and unloading of. Indirect evidence has been obtained for symplastic unloading in storage and utilization sinks. Phloem loading and unloading in plants biology discussion. The phenomenon links sink metabolism andor compartmentation with phloem transport to, and partitioning between, sinks. In other sinks transfer to the apoplast may occur, but not necessarily at the sieve element. During phloem unloading, multiple celltocell transport events move organic substances to the root meristem. Pdf phloem loading and unloading of cowpea mosaic virus.
Phloem loading and unloading plant physiology sugar. Munch hypothesis a high concentration of sugar develops in phloem cell near the source. This article is from frontiers in plant science, volume 4. Sinks include metabolism, growth, storage, and other processes or. Vehicles at work checklist section 6 unloading activities hse. Lecture 5 translocation in phloem botany notes edurev. The nature of the linkage depends upon the cellular pathway and mechanism of unloading.
Code of practice for the safe loading and unloading of bulk. The common unloading pathway is symplasmic, with an. Several studies of phloem unloading have failed to distinguish between transport events occurring at the sieve elementcompanion cell boundary and subsequent shortdistance transport through parenchyma cells. Ppt phloem translocation powerpoint presentation free. Winner of the standing ovation award for best powerpoint templates from presentations magazine. Learn phloem transport with free interactive flashcards. Copies of this manual can be downloaded free of charge from. Passive phloem loading and longdistance transport in a. A blank document is available on the cefic, fecc and ecta websites as a writable pdf.
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