SIEVE PLATE Meaning and
Definition
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A sieve plate is a specialized structure found in certain types of plant tissues, particularly in the phloem of vascular plants. It is comprised of a group of cells known as sieve tube elements that are arranged end to end to form a long tubular structure called a sieve tube. These sieve tube elements are connected to each other through sieve plates, which act as porous partitions between adjacent cells.
The primary function of a sieve plate is to enable the transport of photosynthates, such as sugars and other organic molecules, from the leaves where they are produced to different parts of the plant. The presence of small perforations or sieve pores in the sieve plate allows for the movement of substances between adjacent sieve tube elements. These pores are created by the modification of the cell wall, resulting in a sieve-like structure that permits the flow of nutrients while maintaining structural integrity.
The sieve plate serves as a critical site for the movement and distribution of assimilates throughout the plant. As the phloem sap passes through the sieve tube elements, it must traverse the sieve plate to reach the next adjacent cell. This transport occurs through active processes, such as cytoplasmic streaming and mass flow, facilitated by various regulatory proteins and molecular mechanisms.
In summary, a sieve plate is a specialized structure in the phloem tissue of plants that allows for the efficient transport of sugars and other assimilates from the source to the sink tissues. It consists of a network of sieve tube elements connected by sieve plates, containing sieve pores that permit the movement of nutrients while maintaining structural support.
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Lamina cribrosa of the ethmoid.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Common Misspellings for SIEVE PLATE
- aieve plate
- zieve plate
- xieve plate
- dieve plate
- eieve plate
- wieve plate
- sueve plate
- sjeve plate
- skeve plate
- soeve plate
- s9eve plate
- s8eve plate
- siwve plate
- sisve plate
- sidve plate
- sirve plate
- si4ve plate
- si3ve plate
- siece plate
- siebe plate
Etymology of SIEVE PLATE
The term "sieve plate" originated from the combination of two words: "sieve" and "plate".
The word "sieve" traces back to the Old English noun "sife", which referred to a device used for separating materials by allowing smaller particles to pass through while larger ones remain behind. This term further developed from the Proto-Germanic word "*sibjō" and the Proto-Indo-European root "*seip-" meaning "to trickle" or "to sift".
The word "plate" comes from the Old English noun "plat", which denoted a flat, extended surface. It can be traced back to the Old French term "plat" and the Latin word "plattus", both meaning "flat" or "broad".
Combining these two words, "sieve plate" refers to a flat or extended surface with small openings or perforations, resembling a sieve.
