Effect of nutrient levels on defense against specialist insects in an invasive alligator weed

ZHOU Fang 1 ZHANG Zhijie 1 LIU Mu 1 PAN Xiaoyun 1

(1.Institute of Biodiversity Science, Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Fudan University, Shanghai 200438)

【Abstract】Evolution of Increased Competitive Ability (EICA) has suggested that exotic plants may reduce resource allocation to anti-herbivore defenses and increase allocation to growth due to reduced specialist herbivores in introduced ranges. However, the major limitation for the hypothesis may be that, as important defensive strategies, induced resistance and tolerance were seldom tested and little information was known regarding the evolution of defensive strategies as influenced by resource availability. Nine introduced and nine native populations of Alternanthera philoxeroides were compared for fitness and two morphological traits that influenced herbivory, specifically specific stem length (SSL, plants with low SSL had hollow stems favoured by a stem-boring specialist insect Agasicles hygrophila) and root/shoot ratio (RSR) under low and high nutrient availability and with or without A. hygrophila. Introduced populations showed greater total biomass (+14.7%) and lower SSL (−27.5%), demonstrating increased growth and decreased levels of constitutive defense. Tolerance to herbivory was similar between introduced and native populations. The SSL plasticity to herbivory was greater in introduced populations under high nutrient levels, and was positively correlated with the total biomass. These results suggest that although both functional trait values and plasticity contribute to the adaptation of alligator weeds to a wide range of nutrient availabilities and specialist insect herbivory, introduced populations have evolved higher production of biomass, lower levels of constitutive structural defense, and greater plasticity of structural defense in high nutrient conditions, indicating that the present control practice for A. philoxeroides where introducing A. hygrophila will face great challenges in the future.

【Keywords】 EICA; plant–insect interactions; plasticity; resource availability; induced resistance;

【DOI】

【Funds】 National Natural Science Foundation of China (31370433, 31070369)

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(Translated by MA Y)

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This Article

ISSN:1005-0094

CN:11-3247/Q

Vol 25, No. 12, Pages 1276-1284

December 2017

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Article Outline

Abstract

  • 1 Materials and methods
  • 2 Results
  • 3 Discussion
  • Supplementary materials
  • References