Readers ask: How sucrose is transported in the phloem?

Table Of [Content]

In plants, sucrose is transported from synthesising (source) organs to sink organs where it is stored (as sucrose or, e.g., as starch) or metabolised. In plants, sucrose is transported over long distance in solution in the phloem sap. This flow of sap occurs in a specialised network of cells, called the sieve elements.

Table of Contents

• How is sucrose transported into the phloem?
• How sucrose is transported in the phloem along the stem from the leaf to the fruit?
• How is sucrose transported into a cell?
• How sucrose is transported around the plant by translocation?
• Why sugars are transported in the form of sucrose in phloem?
• What happens when sucrose is transferred to phloem tissue?
• How is sugar obtained and transported through plants?
• Does sucrose use active transport?
• Does phloem transport starch or sucrose?
• How does translocation occur in phloem?
• What is the process that transports substances in the phloem?
• Is phloem active or passive transport?
• How are carbohydrates transported in plants?

How is sucrose transported into the phloem?

Sucrose, RFOs and polyols are transported in the sieve tubes to the sink organs in the transport phloem. All along the path, they can be leaked from and reloaded into the phloem via the same mechanism (not shown). Sucrose is unloaded into the release phloem where the hydrostatic pressure is supposed to be lower.

How sucrose is transported in the phloem along the stem from the leaf to the fruit?

Part of the pressure-flow theory is that the sucrose produced is moved by active transport into the companion cells of the phloem in leaf veins. This theory suggests that the sucrose is transported into the fruit by active transport, raising the sugar concentration in the fruit relative to the sieve tube.

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How is sucrose transported into a cell?

Sucrose is synthesized in the cytoplasm and may move cell to cell through plasmodesmata or may cross membranes to be compartmentalized or exported to the apoplasm for uptake into adjacent cells. As a relatively large polar compound, sucrose requires proteins to facilitate efficient membrane transport.

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How sucrose is transported around the plant by translocation?

The sucrose is transported around the plant in phloem vessels. It needs to be able to reach all cells in the plant so that the sucrose can be converted back into glucose for respiration. The movement of sucrose and other substances like amino acids around a plant is called translocation.

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Why sugars are transported in the form of sucrose in phloem?

Sucrose contains more energy than a monosaccharide, so it is more energy efficient, both in transport as in storage. Secondly, sucrose is a so called non-reducing sugar. This in contrast to glucose that is reactive and can form other products during transport.

What happens when sucrose is transferred to phloem tissue?

Explanation: When the materials like sucrose are transferred to phloem tissue, the osmotic pressure of the tissue causing water to move into it.. leading to moves the material in the phloem to tissues which have less pressure of water into/from it.

How is sugar obtained and transported through plants?

They use two different systems – xylem moves water and mineral ions from the roots to the leaves – phloem moves food substances such as sucrose (sugar) and amino acids from leaves to the rest of the plant. This movement of food is called translocation.

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Does sucrose use active transport?

The sucrose is actively transported against its concentration gradient (a process requiring ATP) into the phloem cells using the electrochemical potential of the proton gradient. This is coupled to the uptake of sucrose with a carrier protein called the sucrose-H⁺ symporter.

Does phloem transport starch or sucrose?

Phloem: Active transport of sucrose from source cells into phloem sieve tube elements (energy required)

How does translocation occur in phloem?

Phloem consists of living cells arranged end to end. Phloem transports sucrose and amino acids up and down the plant. This is called translocation. In general, this happens between where these substances are made (the sources) and where they are used or stored (the sinks).

What is the process that transports substances in the phloem?

Transport of substances in the phloem is called translocation.

Is phloem active or passive transport?

Xylem tissue transports water and dissolved minerals from roots to leaves, using some active transport, but mostly passive processes. Phloem tissue transports dissolved sugars up or down a plant, using active transport and osmosis.

How are carbohydrates transported in plants?

Carbohydrates are mainly transported in the phloem in the form of sucrose. The cell membrane of the sieve cells contains pump proteins that actively convey sucrose into the vascular pathways. In order to track down the function of the SWEET proteins, they switched off the corresponding genes in a series of plants.