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Biology: The Unity and Diversity o...
Biology: The Unity and Diversity o...
Volatile Secondary Metabolites in Plant Stress Responses In 2007, researchers Casey Delphia, Mark Mescher, and Consuelo De Moraes (pictured at left) published a study on the production of different volatile chemicals by tobacco plants in response to predation by two types of insects: western flower thrips and tobacco budworms. Their results are shown in FIGURE 30.19.
FIGURE 30.19 Volatile (airborne) compounds produced by tobacco plants in response to predation by different insects. Plants were untreated (C), attacked thrips (T), mechanically wounded (W), mechanically wounded and attacked by thrips (WT), attacked by budworms (HIV), or attacked by budworms and thrips (HVT). Values are in nanograms/day.
Which chemical was produced in the greatest amount? What was the stimulus?
To determine: The chemical that was produced in the greatest amount and its stimulus.
Concept introduction: Secondary metabolites are produced as metabolic intermediate or product but they are not essential for growth. They play a role in reinforcement of tissues for example cellulose, suberin, lignin; protection, and serve as attractants for pollinators. They contribute in plant’s ability to compete and survive. Volatile compounds are such secondary metabolites produced by plants. They attract insects for pollination as well as provide defensive signaling systems against pests and diseases.
As given in the problem statement, the researchers studied the production of different volatile chemicals by tobacco plants in response to predation by insects- western flower thrips and tobacco budworms. Refer Fig. 30.19, “Volatile (airborne) compounds produced by tobacco plants in response to predation by different insects” in the textbook...
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