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 30.20.
Volatile Compound Produced | Treatment | |||||
C | T | W | WT | HV | HVT | |
Myrcene | 0 | 0 | 0 | 0 | 17 | 22 |
β-Ocimene | 0 | 433 | 15 | 121 | 4.299 | 5.315 |
Linatod | 0 | 0 | 0 | 0 | 125 | 178 |
indole | 0 | 0 | 0 | 0 | 74 | 142 |
Nicotine | 0 | 0 | 233 | 160 | 390 | 538 |
β-Etemene | 0 | 0 | 0 | 0 | 90 | 102 |
β-Caryophyllene | 0 | 100 | 40 | 124 | 3.704 | 6.166 |
α-Humutene | 0 | 0 | 0 | 0 | 123 | 209 |
Sesquiterpene | 0 | 7 | 0 | 0 | 219 | 268 |
α-Farnesene | 0 | 15 | 0 | 0 | 293 | 457 |
Caryophyltene oxide | 0 | 0 | 0 | 0 | 89 | 166 |
Total | 0 | 555 | 288 | 406 | 9.423 | 13.563 |
FIGURE 30.20 Volatile (airborne) compounds produced by tobacco plants (Nicotiana tabacum) in response to predation by Different inserts. Plants were untreated (C), attacked by thrips (T), mechanically wounded (W). mechanically wounded and attacked by thrips (WT), attacked by budworms (HVJ, or attacked by budworms and thrips (HVTJ. Values are nanograms/day.
2. Which volatile chemical was produced in the greatest amount? What was the stimulus?
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- Bruce Ames and his colleagues have pointed out that although detailed toxicological analysis has been conducted on synthetic chemicals, almost no information is available about the mutagenic or carcinogenic effects of the toxins produced by plants as a natural defense against fungi, insects, and animal predators. Tens of thousands of such compounds have been discovered, and he estimates that in the United States adults eat about 1.5 g of these compounds each daylevels that are approximately 10,000 times higher than those of the synthetic pesticides present in the diet. For example, cabbage contains 49 natural pesticides and metabolites, and only a few of these have been tested for their carcinogenic and mutagenic effects. a. With the introduction of new foods into the U.S. diet over the last 200 years (mangoes, kiwi fruit, tomatoes, and so forth), has there been enough time for humans to develop resistance to the mutagenic effects of the toxins present in those foods? b. The natural pesticides present in plants constitute more than 99% of the toxins we eat. Should diet planning, especially for vegetarians, take into account the doses of toxins present in the diet?arrow_forwardVolatile 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 30.20. Volatile Compound Produced Treatment C T W WT HV HVT Myrcene 0 0 0 0 17 22 -Ocimene 0 433 15 121 4.299 5.315 Linatod 0 0 0 0 125 178 indole 0 0 0 0 74 142 Nicotine 0 0 233 160 390 538 -Etemene 0 0 0 0 90 102 -Caryophyllene 0 100 40 124 3.704 6.166 -Humutene 0 0 0 0 123 209 Sesquiterpene 0 7 0 0 219 268 -Farnesene 0 15 0 0 293 457 Caryophyltene oxide 0 0 0 0 89 166 Total 0 555 288 406 9.423 13.563 FIGURE 30.20 Volatile (airborne) compounds produced by tobacco plants (Nicotiana tabacum) in response to predation by Different inserts. Plants were untreated (C), attacked by thrips (T), mechanically wounded (W). mechanically wounded and attacked by thrips (WT), attacked by budworms (HVJ, or attacked by budworms and thrips (HVTJ. Values are nanograms/day. 1. Which treatment elicited the greatest production of volatiles?arrow_forwardWhat is ABA ?Give it effects on plants ?arrow_forward
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