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Natural selection on not-so-natural plants

Date:
November 14, 2010
Source:
University of Chicago Press Journals
Summary:
New research shows that while a genetically modified squash plant may be resistant to common virus transmitted by aphids, it's no match for bacteria transmitted by beetles.

Research by Andrew Stephenson and his colleagues at Penn State shows that while a genetically modified squash plant may be resistant to common virus transmitted by aphids, it's no match for bacteria transmitted by beetles.

Stephenson's ongoing research program examines what happens when modified genes, known as transgenes, escape into fields of wild squash. Stephenson is investigating a particular transgene that gives squash plants extra resistance to a virus that commonly infects both wild and cultivated squash. Scientists have long worried that if transgenes like this one escape into the wild, plants with the gene may grow unchecked and wreak havoc on ecosystems.

Stephenson's field experiments, which have been going on for four years now, show that the transgene does help plants resist the target virus. When aphids that carry the virus arrive in experimental fields in the spring, wild plants without the transgene tend to become infected while transgenic plants stay healthy. Good health, however, makes the transgenic squash look tasty to beetles. Beetles preferentially attack transgenic squash, infecting many with devastating bacteria. The beetle attack neutralizes nearly all of the fitness advantage the transgenic squash may have enjoyed by being resistant to viral infection. So in this case, natural selection kept the genetically modified plants in check.

The research is published in the November/December issue of the International Journal of Plant Sciences.


Story Source:

The above story is based on materials provided by University of Chicago Press Journals. Note: Materials may be edited for content and length.


Journal Reference:

  1. Miruna A. Sasu, Matthew J. Ferrari, Andrew G. Stephenson. Interrelationships among a Virus-Resistance Transgene, Herbivory, and a Bacterial Disease in a Wild Cucurbita. International Journal of Plant Sciences, 2010; 171 (9): 1048 DOI: 10.1086/656531

Cite This Page:

University of Chicago Press Journals. "Natural selection on not-so-natural plants." ScienceDaily. ScienceDaily, 14 November 2010. <www.sciencedaily.com/releases/2010/11/101110213123.htm>.
University of Chicago Press Journals. (2010, November 14). Natural selection on not-so-natural plants. ScienceDaily. Retrieved April 17, 2014 from www.sciencedaily.com/releases/2010/11/101110213123.htm
University of Chicago Press Journals. "Natural selection on not-so-natural plants." ScienceDaily. www.sciencedaily.com/releases/2010/11/101110213123.htm (accessed April 17, 2014).

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