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Questions and Answers
What is the main role of the sieve tubes in phloem tissue?
What is the main role of the sieve tubes in phloem tissue?
- To conduct water
- To provide structural support
- To transport sugars and other solutes (correct)
- To store nutrients
Which tissue is more complex based on the provided content?
Which tissue is more complex based on the provided content?
- Collenchyma
- Phloem (correct)
- Xylem
- Parenchyma
What is the primary component found in mature sieve elements?
What is the primary component found in mature sieve elements?
- Chloroplast
- Ribosome
- P-Protein (correct)
- Nucleus
Which process is described as movement of sugar from source to sink?
Which process is described as movement of sugar from source to sink?
What does 'short distance transport' of assimilates entail?
What does 'short distance transport' of assimilates entail?
How is long distance transport defined in the context of assimilate transport?
How is long distance transport defined in the context of assimilate transport?
Which of the following best describes the protoplasm in mature sieve elements?
Which of the following best describes the protoplasm in mature sieve elements?
Why is the transport of assimilates essential for plants?
Why is the transport of assimilates essential for plants?
Which factor does not directly affect the process of assimilate transport?
Which factor does not directly affect the process of assimilate transport?
What are sieve plates in the context of phloem structure?
What are sieve plates in the context of phloem structure?
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Study Notes
Translocation of Assimilates
- Assimilate transport is the process of exchanging metabolites among functionally specialized organs and tissues in plants.
- This process is essential to understand:
- The distribution of photosynthetic products in plants
- Their accumulation in storage organs
- Their mobilization during resumed growth
- The effect of climatic factors and farming practices on the above process
Definition and Types of Assimilate Transport
- Translocation is the process of sugar movement from source to sink in sieve tubes.
- There are two types of assimilate transport depending on the distance of transport:
- Short distance transport: movement of sugar from mesophyll cells to the vicinity of sieve elements in the smallest veins of the leaf, involving a distance of only one or three cells diameter.
- Long distance transport: translocation of sucrose and other solutes from source to sink inside the sieve elements.
Anatomy of Phloem Tissue
- Phloem tissue is more complex than xylem tissue.
- The main components of phloem are sieve tubes.
- Sieve tubes are composed of longitudinally arranged individual cells called sieve elements with perforated end walls called sieve plates.
- Sieve elements are living cells, but lack a nucleus and have a differentially permeable membrane.
- Sieve elements contain a fibrillar protein called P-Protein (Phloem protein).
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