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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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TCE Uptake by Transgenic Plants Plants used for phytoremediation take up pollutants, then transport the chemicals to cells that store, detoxify, or release them to the air. Researchers are now engineering transgenic plants that have an enhanced ability to carry out these tasks.

Sharon Doty and her colleagues published the results of their efforts to genetically engineer plants for phyroremediation of soil and air contaminated with organic solvents. The researchers used Agrobacterium tumefaciens (Section 15.7) to deliver a mammalian gene into poplar plants. The gene encodes cytochrome P450, an enzyme involved in the breakdown of a range of organic molecules, including solvents such as TCE. FIGURE 28.1 shows data from one test on the resulting transgenic plants.

Chapter 28, Problem 1DAA, TCE Uptake by Transgenic Plants Plants used for phytoremediation take up pollutants, then transport

FIGURE 28.1 TCE uptake from air by transgenic poplar plants.

Individual potted plants were kept in separate sealed containers with an initial level of TCE (trichloroethylene) around 15,000 micrograms per cubic meter of air. Samples of the air in the containers were taken daily and measured for TCE content. Controls included a tree transgenic for a Ti plasmid with no cytochrome P45D in it (vector control), and a bare-root transgenic tree (one that was not planted in soil).

How many transgenic plants did the researchers test?

Summary Introduction

To determine: The number of transgenic plants that the researchers used for the test.

Introduction: Transgenic plants are the plants whose genomes are altered or modified by inserting a desired foreign gene using certain genetic engineering techniques. Production of transgenic plant was intended for the expression of desired trait in the plants that does not occur naturally in them. Transgene (foreign gene) can be from unrelated origin. Nowadays, transgenic plants play a significant role in phytoremediation (using plants to clean up the environment). The transgenic plants have the transgene, which makes the plant efficient to remove, utilize, and detoxify the pollutants. It can be used to clean up an important soil and air contaminant.

Answer

Correct answer: Six transgenic plants were used for the given test.

Explanation

The given experiment was started with a plan to produce genetically-engineered plants that are able to remediate (phytoremediation) the soil and air contaminated with organic solvents. A mammalian gene that encodes for the cytochrome P450 (break downs organic solvents) was delivered into poplar plants using the vector Agrobacterium tumefaciens. The transgenic poplar plants were tested for their capability to uptake trichloroethylene (TCE) from air. Refer Figure 28.1, “TCE uptake from air by transgenic poplar plants” in the textbook. The graphical representation showed that six poplar plants were selected for the experiment. Out of these, four were planted transgenic plants, one was bare-rooted transgenic plant, and one was control planted transgenic plant with no gene.

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