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Tobacco Plant Attacked by Caterpillars

Published on February 8, 2010 6:03 AM

Recently, scientists discovered that the tobacco plant inhibits a violent attack by caterpillars, which like nothing better than to eat the tobacco plant, by opening its flowers in the morning, instead of the night. This research was investigated by scientist Ian Baldwin and his colleagues. They studied the pollination of a wild tobacco sorts living in the Southwestern United States.

For example one sort of tobacco plant, Nicotiana attenuata, usually opens its flowers at night, during which it is visited, and pollinated, by the night-active hawkmoth, any of various butterflies of the family Sphingidae, having long narrow wings and powerful flight, with the capability to remain over flowers when feeding from the nectar.

In exchange for transferring pollen, the hawkmoth is supplied with a sweet recompense. The hawkmoth also likes to lay its eggs on the plant-eggs that evolve into greedy, leaf-eating caterpillars. The tobacco plant gets superior pollination services out of the hawkmoth.

This is evidently not a perfect result from the plant's perspective, but N. attenuata has an attracting adorn its sleeve.

Excited by oral secretions remitted by the champing caterpillars, N. attenuata executes an amazing modification in flower phenology, in which the flowers open in the morning instead of at night.

This change in flower phenology, as well as other deformations, including a metamorphosis in flower shape and the loss of key chemical attractants, leads to a switch in pollenizer from the hawkmoth to a local hummingbird.

The hawkmoth is usually active during the day and seems to be satisfied with just a nectar remedy.

However tobacco plant faces another problem, connected to the one described by Baldwin and colleagues, in which explained that it tempt not only a pollinator but also attract herbivores.

Also researchers found that the process of the caterpillars' oral secretions which induce the switch in flower phenology can be chemical course.

The function of such a common protection pathway raises the interesting probability that the results of herbivore attack described in the study may be common in plants.

Researchers concluded that nobody had actually noticed this before.

Tobacco Plant Attacked by Caterpillars

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