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Chapter 6: Problem 7

Explain how the fatty acids found in normally functioning cellular membranes also play an important role in the degradation of membranes during leaf senescence.

Short Answer

Expert verified
Fatty acids, being key components of membrane phospholipids, form a major part of cellular membranes. During leaf senescence, the process of aging in plants, enzymes called phospholipases are activated to cleave fatty acids from the phospholipids. These free fatty acids, besides undergoing further breakdown to provide energy, also aid in membrane disintegration. Therefore, fatty acids play a critical role in the degradation of membranes during leaf senescence.

Step by step solution

01

Understanding the role of Fatty Acids in Cellular Membranes

Fatty acids are the major components of phospholipids, which are the building blocks of cellular membranes. The hydrophobic (water-repelling) tails of these fatty acids align to form the interior of the phospholipid bilayer, thus creating a barrier that separates the cell from its external environment.
02

Explaining Leaf Senescence

Senescence is the process of aging in plants - it's a phase in a leaf's life cycle where its metabolic functions slow down and eventually stop. It is a highly regulated and active process, involving degradation of cellular structures and redistribution of their nutrients to other parts of the plant.
03

Connecting Fatty Acids with Senescence

During senescence, breakdown of cellular structures, including membranes, occurs. Fatty acids play a crucial part here. The enzymes named phospholipases are activated, which cleave fatty acids from the phospholipids creating free fatty acids. Those free fatty acids then undergo further breakdown, providing an energy source for the senescing leaf, aiding degradation.

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Most popular questions from this chapter

Describe why the plant cell uses more energy during programmed senescence than during non-senescent, normal cellular function.

Programmed leaf senescence results in a decrease in sucrose concentration in phloem. Does this observation reflect a decrease in the synthesis of intracellular glucose and fructose because of the decline in photosynthesis? Explain.

Discuss the differences between animal and plant mitotic cell senescence.

Explain how the lack of phototropism in an adult plant contributes to the initiation of leaf senescence.

The transition from programmed senescence to stochastic senescence can be characterized by the transition from source to sink metabolism. What is meant by the terms source and sink metabolism? What is the role of sink metabolism in the reproductive characteristics of the plant?
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