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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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