Comparative constitutive resistance in soybean lines to Mexican bean beetle
1986
Chiang, H.-S. | Norris, D.M. | Ciepiela, A. | Oosterwyk, A. | Shapiro, P. | Jackson, M.
Constitutive (i.e., preformed) parameters of Mexican bean beetle (MBB) resistance were demonstrated in PI 227687 soybeans grown under highly controlled and reproducible biotron environmental conditions which favored optimal plant growth and development. Constitutive antifeedants in PI 227687 against the beetle were variously soluble in hexane, ethyl acetate and 100% methanol. Antifeedants also remained in the aqueous residue after the sequential organic extractions. PI 227687 and MBB-susceptible ‘Davis' soybean lines each showed characteristic temporal patterns of L-phenylalanine ammonia-lyase activity. Healthy PI 227687, but not healthy ‘Davis', also showed a characteristic temporal pattern of L-tyrosine ammonia-lyase activity. Activities of the above two enzymes are positively correlated with plant phenylpropanoid metabolism. PI 227687 and ‘Davis' leaves did not differ in content of total phenols. Products from phenylpropanoid metabolism apparently contribute to PI 227687 resistance to MBB feeding.
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