Differential leaf resistance to insects of transgenic sweetgum (Liquidambar styraciflua) expressing tobacco anionic peroxidase |
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| Authors: | P F Dowd L M Lagrimini D A Herms |
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| Institution: | (1) Bioactive Agents Research Unit, U.S. Department of Agriculture, Agricultural Research Service, National Center for Agricultural Utilization Research, 1815 N. University Street, Peoria (Illinois 61604, USA), Fax +1 309 681 6686, US;(2) Department of Horticulture and Crop Sciences, Howlett Hall, 2001 Fyffe Court, The Ohio State University, Columbus (Ohio 43210, USA), US;(3) Department of Entomology, The Ohio State University, Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster (Ohio 44691, USA), US |
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| Abstract: | Leaves of transgenic sweetgum (Liquidambar styraciflua) trees that expressed tobacco anionic peroxidase were compared with leaves of L. styraciflua trees that did not express the tobacco enzyme. Leaves of the transgenic trees were generally more resistant to feeding by
caterpillars and beetles than wild-type leaves. However, as for past studies with transgenic tobacco and tomato expressing
the tobacco anionic peroxidase, the degree of relative resistance depended on the size of insect used and the maturity of
the leaf. Decreased growth of gypsy moth larvae appeared mainly due to decreased consumption, and not changes in the nutritional
quality of the foliage. Transgenic leaves were more susceptible to feeding by the corn earworm, Helicoverpa zea. Thus, it appears the tobacco anionic peroxidase can contribute to insect resistance, but its effects are more predictable
when it is expressed in plant species more closely related to the original gene source.
Received 4 March 1998; received after revision 27 April 1998; accepted 30 April 1998 |
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| Keywords: | , Plant resistance, tent caterpillar, fall webworm, corn earworm, gypsy moth, fall armyworm, cigarette beetle, Nicotiana, |
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