Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 24:163-165 (1984)
© 1984 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Insect Resistance Factor in Soybean PI's 229358 and 227687 Demonstrated by Grafting1

Lavone Lambert and T. C. Kilen2

Soybean [Glycine max (L.) Merr.] plant introductions (PI) 229358 and 227687 have been reported to be resistant and the cultivar Davis to be susceptible to foliar-feeding by corn earworm, Heliothis zea (Boddie). A bioassay technique utilizing expanding leaves from non-grafted and reciprocally-grafted Davis, PI 229358, and PI 227687 plants was used to determine if resistance or susceptibility is conditioned by translocated factors. Corn earworm larvae reared on leaves from non-grafted Davis plants were significantly (P = 0.01) larger on Day 16 than larvae reared on leaves from Davis scions or stocks of reciprocallygrafted plants. Larvae reared on leaves from non-grafted PI plants were significantly (P = 0.01) smaller than larvae reared on leaves from non-grafted Davis plants, but were not significantly smaller than larvae reared on leaves from PI scions or stocks of reciprocally-grafted plants. Thus, a resistance factor which is translocated throughout the leaves is indicated for PI 229358 and PI 227687. Translocatable factors which condition susceptibility were not indicated.

Key Words: Lepidoptera • Noctuidae • Heliothis zea (Boddie) • Glycine max (L.) Merr. • Resistance

1 Joint contribution from USDA-ARS and the Delta Branch, Mississippi Agric, and For. Exp. Stn., Stoneville, MS 38776. Journal Article no. 5433.

2 Research entomologist and research geneticist, respectively, USDA-ARS, Soybean Production Res., Delta States Res. Ctr., Stoneville, MS 38776.

Received for publication March 21, 1983.




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