IS INDUCTION RESPONSE NEGATIVELY CORRELATED WITH CONSTITUTIVE RESISTANCE IN BLACK MUSTARD

摘要: Black mustard, Brassica nigra, is highly variable in both constitutive resistance and induction response following damage by herbivores. A focal population from Ithaca, New York, was used to test the two predictions of optimal defense theory: (1) that allocation will reduce plant performance absence herbivores; (2) be negatively correlated with resistance. The experiment consisted a half-sib mating design 47 paternal families four dams per sire, fully crossed treatment consisting 25% leaf removal cabbage white butterfly, Pieris rapae, when plants had leaves. Leaf trichome density, sinigrin concentration, glucobrassicin concentration were 38%, 19%, 16% higher, respectively, for seventh damaged plants. Paternal did not vary significantly their response. Narrow-sense heritabilities 5 0.51, 0.76, 0.50 2 hs respectively. Positive genetic correlations found between glu- cobrassicin days first flower, suggesting cost Induction responses density concentration. results therefore consistent theory, offering modest evidence predictions.