Question

What is the function and structure of sieve elements?

   What is the function and structure of sieve elements?

Plant Systematics

Plant Systematics

Michael G. Simpson 2nd Edition

Chapter 4, Problem 15

Instant Answer

Solved by Expert Amy Jiang

02/04/2020

Step 1

Their main function is to transport organic nutrients, such as sugars and amino acids, from the leaves to other parts of the plant, including the roots, stems, and fruits. This transportation of nutrients is essential for the growth and development of the Show more…

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What is the function and structure of sieve elements?

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Key Concepts

Phloem

Phloem is one of the two major types of vascular tissue in plants that is responsible for the transport of organic compounds, particularly sugars produced during photosynthesis, from the leaves to the rest of the plant. This tissue includes specialized cells that work together to move nutrients efficiently over long distances.

Sieve Elements

Sieve elements are highly specialized cells within the phloem that facilitate the long-distance transport of nutrients. They have a unique structure characterized by a reduced cytoplasmic content and the absence or reduction of nuclei and other organelles, which minimizes resistance to flow. Their structure is optimized for rapid translocation of organic molecules throughout the plant.

Companion Cells

Companion cells are closely associated with sieve elements and are essential for their function. Since sieve elements lack many metabolic organelles, companion cells provide the necessary metabolic support, including energy and regulatory signals, to maintain the functionality of sieve elements and aid in loading and unloading of nutrients.

Sieve Plates

Sieve plates are specialized, porous cell wall structures found at the ends of adjacent sieve elements. They contain sieve pores that allow the cytoplasmic contents to flow freely between cells, thereby enabling the efficient transport of organic compounds through the interconnected network of phloem cells.

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