Sieve tube elements are specialized cells found in the phloem of vascular plants and are responsible for the transport of organic molecules, such as sugars and amino acids, throughout the plant. These cells form a long, narrow tube-like structure that is connected end to end, forming a continuous network throughout the plant.
The primary function of sieve tube elements is to facilitate the movement of nutrients from regions of high concentration, such as the leaves, to regions of low concentration, such as the roots. This process is known as translocation and is essential for the growth and maintenance of the plant's tissues.
Sieve tube elements are adapted for translocation in several ways. They lack most organelles, including a nucleus, to create more room for the flow of organic molecules. The walls of sieve tube elements are perforated with sieve plates, which allows for the free flow of nutrients between adjacent cells. Companion cells, which are located next to sieve tube elements, aid in the transport of organic molecules by providing energy and nutrients to the sieve tube elements.
In summary, the function of sieve tube elements is to transport organic molecules, such as sugars and amino acids, from the leaves to other parts of the plant via the phloem in a process known as translocation.
function of sieve tube elements in phloem
1 answer
1 answer