IS INDUCTION RESPONSE NEGATIVELY CORRELATED WITH CONSTITUTIVE RESISTANCE IN BLACK MUSTARD?
Open Access
- 1 November 2002
- Vol. 56 (11) , 2196-2205
- https://doi.org/10.1111/j.0014-3820.2002.tb00144.x
Abstract
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 following two predictions of optimal defense theory: (1) that allocation to resistance will reduce plant performance in the absence of herbivores; and (2) that induction response will be negatively correlated with constitutive resistance. The experiment consisted of a half-sib mating design with 47 paternal families and four dams per sire, fully crossed with a damage treatment consisting of 25% leaf removal by the cabbage white butterfly, Pieris rapae, when plants had four leaves. Leaf trichome density, sinigrin concentration, and glucobrassicin concentration were 38%, 19%, and 16% higher, respectively, for the seventh leaf of damaged plants. Paternal families did not vary significantly in their induction response. Narrow-sense heritabilities were h(S)(2) = 0.51, 0.76, and 0.50 for constitutive leaf trichome density, sinigrin concentration, and glucobrassicin concentration, respectively. Positive genetic correlations were found between glucobrassicin concentration and days to first flower, suggesting a genetic cost of resistance. Induction responses were negatively correlated with constitutive allocation for leaf trichome density and sinigrin concentration. The results were therefore consistent with optimal defense theory, offering modest evidence for both predictions.Keywords
This publication has 57 references indexed in Scilit:
- Differential induction of trichomes by three herbivores of black mustardOecologia, 2002
- Costs of Induced Responses and Tolerance to Herbivory in Male and Female Fitness Components of Wild RadishEvolution, 1999
- Induced Responses to Herbivory in Wild Radish: Effects on Several Herbivores and Plant FitnessEcology, 1999
- Relaxation of an induced defense after exclusion of herbivores: spines on Acacia drepanolobiumOecologia, 1998
- Evolution in heterogeneous environments: genetic variability within and across different grains in Tribolium castaneumHeredity, 1995
- Effect of wounding and jasmonates on the physico-chemical properties and flea beetle defence responses of canola seedlings, Brassica napus L.Canadian Journal of Plant Science, 1994
- Plant Development: The making of a plant hairCurrent Biology, 1994
- Inheritance of leaf area and hooked trichome density of the first trifoliolate leaf in common bean (Phaseolus vulgaris L.)Canadian Journal of Plant Science, 1994
- Evolution of Trichome Number in a Naturalized Population of Brassica rapaThe American Naturalist, 1994
- The Cost of Defense Against Herbivores: An Experimental Study of Trichome Production in Brassica rapaThe American Naturalist, 1993