Natures wonders: insects silence plant defenses (Introduction)

by David Turell , Thursday, February 18, 2021, 21:53 (1372 days ago) @ David Turell

Releasing defensive enzymes:

https://www.sciencedaily.com/releases/2021/02/210217151011.htm

"'We have discovered a new strategy whereby an insect uses saliva to inhibit the release of airborne plant defenses through direct manipulation of plant stomata," said Gary Felton, professor and head of the Department of Entomology at Penn State, noting that stomata are tiny pores on plant leaves that regulate gas exchange, including plant defensive emissions and carbon dioxide, between the plant and the environment.

"Specifically, the researchers studied the effects of a particular enzyme -- glucose oxidase (GOX) -- that occurs in the saliva of tomato fruitworm caterpillars (Helicoverpa zea) on plant stomata and plant defensive emissions, called herbivore-induced plant volatiles (HIPV).

"'HIPVs are thought to help protect plants from insect herbivores by attracting natural enemies of those herbivores and by alerting neighboring plants to the presence of herbivores nearby," Felton said. "Consequently, stomatal closure has the potential to alter interactions across the entire plant community."

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"Indeed, the team -- comprising experts in molecular biology, chemical ecology, plant physiology and entomology -- found that GOX, secreted by the caterpillar onto leaves, causes stomatal closure in tomato plants within five minutes, and in both tomato and soybean plants for at least 48 hours. They also found that GOX inhibits the emission of several HIPVs during feeding, including (Z)-3-hexenol, (Z)-jasmone and (Z)-3-hexenyl acetate, which are important airborne signals in plant defenses. Interestingly, they did not find an effect of GOX on the cotton plants, which, the team said, suggests that the impacts of GOX on stomatal conductance is species dependent."

Comment: War between organisms is a part of life. What the plants are capable of producing affords secondary defenses, not immediate lethal. That allows the insects to try to adapt, but as I view it, enzymes are enormous complex molecules that God might have designed