How phloem translocation happen in the phloem tissue from source to sink?

Sugars produced in sources, such as leaves, need to be delivered to growing parts of the plant via the phloem in a process called translocation, or movement of sugar. The photosynthates from the source are usually translocated to the nearest sink through the phloem sieve tube elements.

What is the main assimilate transported in phloem?

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.

How do the sieve tubes in a phloem aid with transportation?

Transport of substances in the phloem is called translocation . Sieve tubes – specialised for transport and have no nuclei . Each sieve tube has a perforated end so its cytoplasm connects one cell to the next. Sucrose and amino acids are translocated within the living cytoplasm of the sieve tubes.

How are assimilates transported from source to sink?

Assimilates move through the spaces in the loose cellulose fibres of the cell wall, known as the apoplast. Water osmoses into the companion cell, increasing turgor pressure. The water carrying the assimilates then moves to an areas of lower pressure – the sinks – in a mass transport system.

How is translocation achieved in phloem?

Phloem translocation is generally believed to be driven by pressure and is achieved by utilizing energy. Material like sucrose is transferred into phloem tissue using energy from ATP. This increases the osmotic pressure of the tissue causing water to move into it.

What do you mean by phloem transport explain source and sink relationship?

Sucrose is transported by the vascular tissue phloem from a source to a sink. Source is the place which synthesises the food, i.e., the leaf and sink is the part that needs or stores the food.

What is transported in the 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 does assimilation do for plants?

In horticulture, assimilation refers to the method plants use to absorb organic materials, such as sugars and carbohydrates, as well as inorganic materials from the soil. Assimilation leads to the gradual buildup of cell matter. In living things, assimilation is occurring in every cell to help develop new cells.

What do sieve tubes transport?

The sieve tube members are living cells (which do not contain a nucleus) that are responsible for transporting carbohydrates throughout the plant.

What is the function of sieve tube cells and how are they designed to carry out their functions?

The main functions of sieve tube members include maintaining cells and transporting necessary molecules with the help of companion cells. The sieve tube members are living cells (which do not contain a nucleus) that are responsible for transporting carbohydrates throughout the plant.

Where does translocation of assimilates take place?

The principal assimilates translocated from sites of synthesis (sources) to sites of their utilization in growth and development (sinks) are those of carbon and of nitrogen.