What is the main assimilate transported in phloem?
sucrose
Assimilates including sucrose, amino acids are transferred into sieve elements of fully expanded leaves against significant concentration and electrochemical gradients. This process is referred to as phloem loading.
What is transported through phloem tube?
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 transported in the phloem and what is the direction of transport?
Answer: The food in the form of sucrose is transported by the vascular tissue phloem. The transportation occurs in the direction of the source to sink. Transport of organic solutes from one part of the plant to the other through phloem sieve tubes is called translocation of organic solvents.
What are main processes in translocation?
Comparison of xylem and phloem
| Tissue | Process | What is moved |
|---|---|---|
| Xylem | Transpiration | Moves water and minerals from roots to leaves |
| Phloem | Translocation | Moves food substances from leaves to rest of plant and from stores such as in the roots |
What is assimilate transport?
Assimilate transport in the phloem requires that osmotic pressure at phloem loading sites in leaves exceeds the drop in hydrostatic pressure that is due to transpiration. Assimilate transport thus competes with transpiration for water.
What part of phloem transports food?
Phloem contains Sieve Tubes The living cells of phloem are called sieve tubes. The end walls of cells in the phloem have sieve plates which have tiny holes in them. It is through these holes that the food passes along the phloem tubes.
What are the materials transported in the phloem used for?
Comparison of transport in the xylem and phloem
| Xylem | Phloem | |
|---|---|---|
| Type of transport | Physical process | Requires energy |
| Substances transported | Water and minerals | Products of photosynthesis, including sugars and amino acids dissolved in water |
| Direction of transport | Upwards | Upwards and downwards |
Does phloem transport starch or sucrose?
Phloem: Active transport of sucrose from source cells into phloem sieve tube elements (energy required)
What is translocation of assimilation?
The products of photosynthesis (mainly the sugar sucrose) are a major component of the substance found in the phloem, called assimilate. Ions, amino acids, certain hormones, and other molecules are also found in assimilate. The movement of assimilate is called translocation, or assimilate transport.
What is plant assimilation?
In plants, it refers to the processes of photosynthesis and the absorption of raw materials by which plants derive their nutrition. Examples of assimilation are photosynthesis, nitrogen fixation, and the absorption of nutrients after digestion into the living tissue.
What is assimilate partitioning in plants?
Assimilation refers to the uptake of nutrients while partitioning designates the cell separation or refers to the cell division process. CO2 Capture, Nutrients Uptake and Lipids Content of Microalgae Species Culturing in Wastewater Media.
How are assimilates loaded in phloem?
Assimilates move through the spaces in the loose cellulose fibres of the cell wall, known as the apoplast. They move into the phloem by diffusion. Active transport is used to maintain a concentration gradient.