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Chapter 24: Q.30 (page 639)

Ecologists often attempt to introduce new plants to restore degraded land. In an arid climate, scientists recommend introducing plants with arbuscular mycorrhizae. How would the mycorrhizae increase the plants鈥� survival compared to plants without mycorrhizae?

Short Answer

Expert verified

The plants benefited from the association because mycorrhizae allowed them to move into new habitats and allowed the increased uptake of nutrients, which gave them an enormous selective advantage over plants that did not establish symbiotic relationships.

Step by step solution

01

Step1. Introduction  

The associations between roots and fungi are called mycorrhizae.

Mycorrhizae permits the plant to obtain additional moisture and nutrients. This is particularly important in uptake of phosphorus, one of the major nutrients required by plants. When mycorrhizae are present, plants are less susceptible to water stress.

02

Step2. Explanation

Plants with arbuscular mycorrhizae are colonized by fungi that penetrate root cells, and exchange metabolites with the plant.

The network of fungal hyphae extends from the root cells out into the environment, covering a larger area than the plant's root system alone.

This allows the plant to draw water from a larger area, increasing the likelihood that it can meet its daily needs.

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